Backlight module and display device
By using a stress -shaped variant frame in the backlit module, the problem of light -conducting plates and membrane expansion gap in narrow frame products is solved, and the effect of eliminating the risk of light leakage at the edge is achieved.
Patent Information
- Application Number
- CN202420406178.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-01
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-03-01
AI Technical Summary
In narrow-frame products, the expansion gap between the light guide plate and the film material limits the distance between their edges and the display area, resulting in an increased risk of poor light leakage at the edges.
By setting up the stress -shaped variables in the backlit module, the glue frame can be flexibly variable when squeezed, absorb the expansion of the light guide plate and optical film, thereby reducing the expansion gap or canceling its settings.
Without increasing the expansion gap, it provides sufficient spacing for the light guide board and display panel, eliminating the risk of light leakage of the edge of narrow bezel products.
Smart Images
Figure CN222394244U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of display devices, and in particular to a backlight module and a display device. Background Art
[0002] In display devices, an expansion gap is usually required between the light guide plate and film material (for example, upper diffuser, upper light enhancement film, lower light enhancement film, lower diffuser, reflective sheet, etc.) in the backlight module and the plastic frame. During reliability tests or normal use, the light guide plate and film material will expand due to heat. The existence of the expansion gap can avoid reliability problems such as abnormal display quality caused by extrusion interference due to limited expansion of the light guide plate and film material. Under normal circumstances, the farther the edge of the light guide plate and film material is from the display area, the less likely it is to cause edge light leakage or poor bright line. However, in narrow-frame products, the display area increases, and due to the limitation of the expansion gap, the distance between the edge of the light guide plate and film material and the edge of the display area can only be compressed, resulting in an increasingly high risk of poor edge light leakage in narrow-frame products. Utility Model Content
[0003] The embodiments of the present application provide a backlight module and a display device, which can reduce the expansion gap between the optical film or the light guide plate and the rubber frame while providing sufficient expansion space for the light guide plate and the optical film, so that a sufficient spacing can be designed between the end of the light guide plate and the edge of the display area of the display panel, thereby eliminating the risk of light leakage at the edge of the narrow-frame product.
[0004] In a first aspect, an embodiment of the present application provides a backlight module, comprising:
[0005] A bottom frame, the bottom frame comprising a bottom plate and side plates connected to each other;
[0006] A light guide plate, the light guide plate is located in the bottom frame and is arranged on the bottom plate;
[0007] an optical film, wherein the optical film is disposed in the bottom frame and is located on a side of the light guide plate away from the bottom plate; and
[0008] The glue frame is arranged in the bottom frame and between the end of the light guide plate and the side plate. In the direction from the light guide plate to the glue frame, the glue frame includes at least one stress deformation layer.
[0009] In one embodiment, in the direction from the light guide plate to the glue frame, the glue frame includes a plurality of first glue layers and a plurality of second glue layers stacked together, a second glue layer is sandwiched between two adjacent first glue layers, the first glue layer is set as a hard glue layer, and the second glue layer is set as the stress deformation layer.
[0010] In one embodiment, the first rubber layer is configured as hard rubber; and / or,
[0011] The stress deformation layer is configured as foam.
[0012] In one embodiment, the areas of the first adhesive layer and the second adhesive layer are equal, or the area of the first adhesive layer is greater than the area of the second adhesive layer.
[0013] In one embodiment, the thickness of the plastic frame is set to D1 in the direction from the light guide plate to the plastic frame, wherein 0.3 mm ≤ D1 ≤ 2 mm; and / or,
[0014] In the direction from the light guide plate to the glue frame, the thickness of the glue frame is set to D1, and the deformation amount of the glue frame due to extrusion is set to 0.2D1-0.4D1.
[0015] In one embodiment, the edge of the optical film is arranged beyond the end of the light guide plate;
[0016] The side edge of the optical film is in contact with the plastic frame, or an expansion gap X1 is formed between the side edge of the optical film and the plastic frame, and the expansion gap X1 is set to 0.15 mm to 0.2 mm.
[0017] In one embodiment, the plastic frame has a first end away from the bottom plate;
[0018] The optical film has a first surface away from the light guide plate;
[0019] The first end is arranged flush with the first surface, or the first end is arranged beyond the first surface.
[0020] In one embodiment, the backlight module further includes a guide assembly, the guide assembly includes a sliding groove and a sliding block that are slidably matched, one of the sliding groove and the sliding block is arranged on the bottom plate, and the other is correspondingly arranged on the bottom plate;
[0021] Wherein, the slide groove extends in a direction from the light guide plate to the plastic frame.
[0022] In a second aspect, the present application provides a display device, including:
[0023] display panel; and
[0024] The backlight module mentioned above is arranged on the light incident side of the display panel, and the first end of the plastic frame of the backlight module supports the display panel.
[0025] In one embodiment, a distance H between the end of the light guide plate of the backlight module and the outer edge of the display area of the display panel is set to 0.5 mm to 1.5 mm.
[0026] Beneficial effect: In the backlight module provided by the present application, the glue frame is arranged on the side of the light guide plate and the optical film, and the end of the glue frame facing the optical film is used to support the display panel on one side of the optical film; in the direction from the light guide plate to the glue frame, the glue frame includes at least one stress deformation layer, so that the glue frame can produce elastic deformation after being squeezed; that is, during the reliability test or normal use, after the light guide plate and the optical film are expanded by heat, the glue frame can produce elastic deformation and absorb the expansion of the light guide plate and the optical film, providing sufficient expansion space for the light guide plate and the optical film; in this way, the expansion gap between the optical film or the light guide plate and the glue frame can be reduced, and even on the premise that the deformation of the glue frame is sufficient, the setting of the expansion gap can be cancelled, so that a sufficient spacing can be designed between the end of the light guide plate and the edge of the display area of the display panel, thereby eliminating the risk of edge light leakage of narrow-frame products. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.
[0028] Figure 1 A schematic diagram of the first structure of the backlight module (initial state) provided in an embodiment of the present application;
[0029] Figure 2 A second structural schematic diagram of a backlight module (initial state) provided in an embodiment of the present application;
[0030] Figure 3 A schematic diagram of the structure of a backlight module (in an extruded state) provided in an embodiment of the present application;
[0031] Figure 4 A schematic diagram of the first structure of the plastic frame provided in the embodiment of the present application;
[0032] Figure 5 A second structural schematic diagram of the rubber frame provided in an embodiment of the present application;
[0033] Figure 6 A schematic diagram of the structure of the guide assembly provided in an embodiment of the present application.
[0034] 1000 display device, 100 backlight module, 1 bottom frame, 11 bottom plate, 12 side plate, 2 light guide plate, 3 optical film, 4 glue frame, 41 first glue layer, 42 second glue layer, 5 guide component, 51 slide groove, 52 slider, 200 display panel, A display area, B frame area, 300 shading tape, 400 edge glue, DETAILED DESCRIPTION
[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0036] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as limiting the present application. In addition, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature merely means that the first feature is higher in level than the second feature or that the first feature is lower in level than the second feature, and does not indicate a direct connection relationship.
[0037] In addition, the terms "first" and "second" are used for descriptive purposes only, and the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense without specifically limiting the connection method. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0039] The disclosure below provides many different embodiments to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.
[0040] The embodiments of the present application provide a backlight module and a display device, and the display device may be a television, a smart phone, a tablet, a computer, a wearable device, etc., and no specific limitation is made here.
[0041] First, see Figure 1 and Figure 3 The embodiment of the present application provides a backlight module 100, which includes a bottom frame 1, a light guide plate 2, an optical film 3 and a plastic frame 4; the bottom frame 1 includes a bottom plate 11 and a side plate 12 connected to each other; the light guide plate 2 is located in the bottom frame 1 and is arranged on the bottom plate 11; the optical film 3 is arranged in the bottom frame and is located on the side of the light guide plate 2 away from the bottom frame 1; the plastic frame 4 is arranged in the bottom frame 1 and is located between the end of the light guide plate 2 and the side plate 12, and the plastic frame 4 includes at least one stress deformation layer in the direction from the light guide plate 2 to the plastic frame 4.
[0042] In the backlight module 100 provided in the present application, the plastic frame 4 is arranged on the side of the light guide plate 2 and the optical film 3, and the end of the plastic frame 4 facing the optical film 3 is used to support the display panel 200 on one side of the optical film 3; in the direction from the light guide plate 2 to the plastic frame 4, the plastic frame 4 includes at least one stress deformation layer, so that the plastic frame 4 can produce elastic deformation after being squeezed; that is, during the reliability test or normal use, after the light guide plate 2 and the optical film 3 are heated and expanded, the The plastic frame 4 can undergo elastic deformation and absorb the expansion of the light guide plate 2 and the optical film 3, providing sufficient expansion space for the light guide plate 2 and the optical film 3; in this way, the expansion gap between the optical film 3 or the light guide plate 2 and the plastic frame 4 can be reduced, and even under the premise that the deformation of the plastic frame 4 is sufficient, the setting of the expansion gap can be cancelled, so that a sufficient distance can be designed between the end of the light guide plate 2 and the edge of the display area A of the display panel 200, thereby eliminating the risk of light leakage at the edge of the narrow-frame product.
[0043] It can be known that, in some embodiments, the optical film 3 includes at least a first diffuser, a first light enhancement film, a second light enhancement film and a second diffuser stacked in sequence; the backlight module 100 also includes a reflective sheet arranged between the light guide plate 2 and the bottom frame 1.
[0044] The present application does not limit the specific form of the rubber frame 4. In some embodiments, the rubber frame 4 can be made of a specific material. In the direction from the light guide plate 2 to the optical film 3, the rubber frame 4 is in a hard state and is used to support the display panel 200. In the direction from the light guide plate 2 to the rubber frame 4, the rubber frame 4 can undergo elastic deformation. During reliability testing or normal use, after the light guide plate 2 and the optical film 3 expand due to heat, the expansion of the light guide plate 2 and the optical film 3 is absorbed.
[0045] In some embodiments, the rubber frame 4 includes two hard rubber layers and one stress deformation layer, and the thickness of the stress deformation layer is much greater than the thickness of the hard rubber layer.
[0046] In other embodiments, see Figure 4 and Figure 5 , in the direction from the light guide plate 2 to the glue frame 4, the glue frame 4 includes a plurality of first glue layers 41 and a plurality of second glue layers 42 stacked, a second glue layer 42 is sandwiched between two adjacent first glue layers 41, the first glue layer 41 is set as a hard glue layer, and the second glue layer 42 is set as the stress deformation layer; wherein, the plurality of first glue layers 41 are used to support the display panel 200 toward the side of the optical film 3; that is, the glue frame 4 is a multi-film layer structure, in the direction from the light guide plate 2 to the glue frame 4, the second glue layer 42 can undergo elastic deformation, so that the glue frame 4 can undergo elastic deformation, and in the direction from the light guide plate 2 to the optical film 3, the first glue layer 41 can support the display panel 200; in this way, it can absorb the expansion of the light guide plate 2 and the optical film 3 during reliability testing or normal use, and at the same time, it can take into account the support of the display panel 200.
[0047] The present application does not impose any specific limitation on the materials of the first adhesive layer 41 and the second adhesive layer 42 .
[0048] In one embodiment, the first rubber layer 41 is configured as hard rubber.
[0049] In one embodiment, the stress deformation layer is configured as foam.
[0050] It should be noted that the above two technical features can be set selectively or simultaneously. Specifically, in one embodiment, the above two technical features are set simultaneously, that is, the rubber frame 4 includes multiple layers of hard rubber and multiple layers of foam, and a layer of foam is sandwiched between two adjacent layers of the hard rubber. The hard rubber can support the display panel 200, and the foam can produce deformation to absorb the expansion of the light guide plate 2 and the optical film 3.
[0051] The present application does not impose any specific limitation on the size of the first adhesive layer 41 and the second adhesive layer 42. Figure 4 , the first adhesive layer 41 and the second adhesive layer 42 have the same area, and the second adhesive layer 42 can be elastically deformed in the direction from the light guide plate 2 to the adhesive frame 4, so that the adhesive frame 4 can be elastically deformed, and the first adhesive layer 41 can support the display panel 200 in the direction from the light guide plate 2 to the optical film 3; in other embodiments, please refer to Figure 5 The area of the first adhesive layer 41 is greater than the area of the second adhesive layer 42 . Thus, the material usage of the second adhesive layer 42 can be reduced, thereby reducing costs.
[0052] In one embodiment, the thickness of the plastic frame 4 is set to D1 in the direction from the light guide plate 2 to the plastic frame 4, wherein 0.3mm≤D1≤2mm; thus, the plastic frame 4 will not occupy too much space due to being too thick, nor will it be too thin to cause insufficient deformation.
[0053] In one embodiment, in the direction from the light guide plate 2 to the rubber frame 4, the thickness of the rubber frame 4 is set to D1, and the deformation amount of the rubber frame 4 due to extrusion is set to 0.2D1~0.4D1; that is, the light guide plate 2 and the optical film 3 expand, and the thickness of the rubber frame 4 after compression is 0.6D1~0.8D1, so as to ensure that the deformation amount of the rubber frame 4 due to extrusion can meet the expansion amount of the light guide plate 2.
[0054] It should be noted that the above two technical features can be set either one or at the same time; specifically, in one embodiment, the above two technical features are set at the same time.
[0055] It can be known that during reliability testing or normal use, the light guide plate 2 and the optical film 3 will expand due to heat. Since the expansion of the light guide plate 2 is greater than the expansion of the optical film 3, in the initial state, the edge of the optical film 3 can be set beyond the end of the light guide plate 2.
[0056] The present application does not impose any specific limitation on the location of the optical film 3 .
[0057] In some embodiments, see Figure 1 , under the premise that the deformation of the plastic frame 4 is sufficient, the side of the optical film 3 is attached to the plastic frame 4. Since the edge of the optical film 3 exceeds the light guide plate 2, there is still a certain expansion gap between the light guide plate 2 and the plastic frame 4. The expansion gap and the deformation of the plastic frame 4 can provide an accommodation space for the expansion of the light guide plate 2; at the same time, since the side of the optical film 3 is attached to the plastic frame 4, the expansion gap between the optical film 3 and the plastic frame 4 is 0, so that a sufficient spacing can be designed between the end of the light guide plate 2 and the edge of the display area A of the display panel 200, thereby eliminating the risk of light leakage at the edge of the narrow-frame product.
[0058] In some embodiments, see Figure 2An expansion gap X1 is formed between the side of the optical film 3 and the rubber frame 4, and the expansion gap X1 is set to 0.15mm~0.2mm; the expansion gap X1 is set between the optical film 3 and the rubber frame 4, which can absorb the expansion of the optical film 3; because the edge of the optical film 3 exceeds the light guide plate 2, the expansion gap X2 between the light guide plate 2 and the rubber frame 4 is greater than the expansion gap X1 between the optical film 3 and the rubber frame 4, so that the expansion of the light guide plate 2 can be better absorbed; in this way, under the premise of ensuring that the expansion of the optical film 3 and the light guide plate 2 is absorbed, the expansion gap X1 can be reduced, so that a sufficient spacing can be designed between the end of the light guide plate 2 and the edge of the display area A of the display panel 200, eliminating the risk of edge light leakage of narrow-frame products.
[0059] Based on the above embodiments, it can be known that in the initial state, the expansion gap X2 between the light guide plate 2 and the rubber frame 4 is set to 0.3mm~0.5mm; in this way, the expansion gap X2 between the light guide plate 2 and the rubber frame 4 and the deformation of the rubber frame 4 can provide accommodation space for the expansion of the light guide plate 2.
[0060] It can be understood that the rubber frame 4 is used to support the display panel on the optical film 3; therefore, the rubber frame 4 has a first end away from the base plate 11; the optical film 3 has a first surface away from the light guide plate 2; the first end is arranged flush with the first surface, or the first end is arranged beyond the first surface.
[0061] See also Figure 6 In one embodiment, the backlight module 100 further includes a guide component 5, the guide component 5 includes a sliding groove 51 and a slider 52 that are slidably matched, the slide groove 51 and the slider 52, one of which is arranged on the rubber frame 4, and the other is correspondingly arranged on the bottom plate 11; wherein the slide groove 51 extends in a direction from the light guide plate 2 to the rubber frame 4; it can be understood that after the light guide plate 2 is heated and expanded, the expansion amount of each part of the light guide plate 2 is uneven, which causes the squeezing force received by each part of the rubber frame 4 to be different, which easily causes the rubber frame 4 to be skewed; the guide component 5 is arranged between the bottom plate 11 and the rubber frame 4, which can play a guiding role in the compression and rebound of the rubber frame 4, so that the compression and rebound trajectories of the rubber frame 4 are more consistent, thereby improving the stability of the rubber frame 4.
[0062] In one embodiment, the spacing H between the end of the light guide plate 2 and the outer edge of the display area A of the display panel 200 is set to 0.5mm~1.5mm; this can ensure that a sufficient spacing can be designed between the end of the light guide plate 2 and the edge of the display area A of the display panel 200, eliminating the risk of light leakage at the edges of narrow-frame products.
[0063] In a second aspect, an embodiment of the present application further provides a display device 1000 , which includes a display panel 200 and a backlight module 100 , wherein the backlight module 100 is disposed on a light incident side of the display panel 200 , and a plastic frame 4 of the backlight module 100 supports the display panel 200 . It should be noted that the backlight module 100 is set as the above-mentioned backlight module 100, that is, the backlight module 100 has all the embodiments of the above-mentioned backlight module 100. During the reliability test or normal use, after the light guide plate 2 and the optical film 3 of the backlight module 100 expand due to heat, the glue frame 4 can undergo elastic deformation and absorb the expansion of the light guide plate 2 and the optical film 3; in this way, the expansion gap between the optical film 3 or the light guide plate 2 and the glue frame 4 can be reduced, and even on the premise that the deformation of the glue frame 4 is sufficient, the setting of the expansion gap can be cancelled, so that a sufficient spacing can be designed between the end of the light guide plate 2 and the edge of the display area A of the display panel 200, thereby eliminating the risk of edge light leakage of narrow-frame products.
[0064] Please read further Figure 1 and Figure 2 The display device 1000 further includes a light shielding tape 300 , and the light shielding tape 300 adheres and fixes the display panel 200 to the plastic frame 4 and the optical film 3 .
[0065] The display device 1000 further includes an edge glue 400 , one end of which is adhered to the bottom plate 11 , and the other end of which covers the side plate 12 and extends to adhere to the frame area B of the display panel 200 .
[0066] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0067] The above is a detailed introduction to a backlight module and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A backlight module, characterized in that: include: A bottom frame, the bottom frame comprising a bottom plate and side plates connected to each other; A light guide plate, the light guide plate is located in the bottom frame and is arranged on the bottom plate; An optical film, wherein the optical film is arranged in the bottom frame and is located at a side of the light guide plate away from the bottom plate; as well as, The glue frame is arranged in the bottom frame and between the end of the light guide plate and the side plate. In the direction from the light guide plate to the glue frame, the glue frame includes at least one stress deformation layer.
2. The backlight module according to claim 1, characterized in that: In the direction from the light guide plate to the glue frame, the glue frame includes a plurality of first glue layers and a plurality of second glue layers stacked together, a second glue layer is sandwiched between two adjacent first glue layers, the first glue layer is set as a hard glue layer, and the second glue layer is set as the stress deformation layer.
3. The backlight module according to claim 2, characterized in that: The first rubber layer is configured as hard rubber; and / or, The stress deformation layer is configured as foam.
4. The backlight module according to claim 2, wherein: The areas of the first adhesive layer and the second adhesive layer are equal, or the area of the first adhesive layer is greater than the area of the second adhesive layer.
5. The backlight module according to claim 1, wherein: In the direction from the light guide plate to the plastic frame, the thickness of the plastic frame is set to D1, wherein 0.3 mm ≤ D1 ≤ 2 mm; and / or, In the direction from the light guide plate to the glue frame, the thickness of the glue frame is set to D1, and the deformation amount of the glue frame due to extrusion is set to 0.2D1-0.4D1.
6. The backlight module according to claim 1, wherein: The edge of the optical film is arranged beyond the end of the light guide plate; The side edge of the optical film is in contact with the plastic frame, or an expansion gap X1 is formed between the side edge of the optical film and the plastic frame, and the expansion gap X1 is set to 0.15 mm to 0.2 mm.
7. The backlight module according to claim 1, wherein: The plastic frame has a first end portion away from the bottom plate; The optical film has a first surface away from the light guide plate; The first end is arranged flush with the first surface, or the first end is arranged beyond the first surface.
8. The backlight module according to claim 1, wherein: The backlight module further comprises a guide assembly, the guide assembly comprises a sliding groove and a sliding block which are slidably matched, one of the sliding groove and the sliding block is arranged on the plastic frame, and the other is correspondingly arranged on the bottom plate; Wherein, the slide groove extends in a direction from the light guide plate to the plastic frame.
9. A display device, characterized in that: include: Display panel; as well as, The backlight module according to any one of claims 1 to 8, wherein the backlight module is arranged on the light incident side of the display panel, and the end of the rubber frame of the backlight module away from the bottom plate supports the display panel.
10. The display device according to claim 9, characterized in that The distance H between the end of the light guide plate of the backlight module and the outer edge of the display area of the display panel is set to 0.5 mm to 1.5 mm.