Backlight module and liquid crystal display device

Abstract

The utility model provides a backlight module and a liquid crystal display device, relates to the technical field of display, and aims to solve the problem of light leakage at the edge of the backlight module. The backlight module comprises a bottom frame; the optical film layer is arranged in the bottom frame; the middle frame is arranged on the bottom frame, and the edge of the optical film layer and the middle frame are arranged in a spaced mode; the middle frame comprises a main body part and a shading part, the main body part is arranged on the bottom frame, and the shading part is connected with the main body part and extends towards the optical film layer, so that the shading part shields a gap between the optical film layer and the middle frame. The problem of light leakage of the backlight module can be solved, and bright edges on the edge of the liquid crystal display device are effectively avoided.

Description

Technical Field

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

[0002] Liquid crystal display (LCD) has many advantages such as thin body, power saving, no radiation, etc., and has been widely used, such as mobile phones, personal digital assistants (PDAs), digital cameras, computer screens or laptop screens. Most of the liquid crystal display devices on the current market are backlight type liquid crystal display devices, which include a housing, a liquid crystal panel arranged in the housing, and a backlight module arranged in the housing. As the requirements for the frame size of liquid crystal display devices become higher and higher, the frame is made narrower and narrower, and light leakage may occur at the edge of the backlight module, resulting in the problem of bright edge at the edge of the display device. Utility Model Content

[0003] In view of this, the present application provides a backlight module and a liquid crystal display device, which are used to improve the problem of light leakage at the edge of the backlight module.

[0004] The technical solution adopted by this application to solve the above technical problems is:

[0005] In a first aspect, an embodiment of the present application provides a backlight module, comprising:

[0006] Bottom frame;

[0007] An optical film layer is arranged in the bottom frame;

[0008] A middle frame is provided on the bottom frame, and an edge of the optical film layer is spaced apart from the middle frame;

[0009] The middle frame includes a main body and a shading portion, the main body is arranged on the bottom frame, the shading portion is connected to the main body and extends toward the optical film layer so that the shading portion blocks the gap between the optical film layer and the middle frame.

[0010] In some embodiments of the present application, a first connecting groove is provided on the side of the main body facing the optical film layer, and a connecting head matching the shape of the first connecting groove is provided on the side of the shading portion facing the main body, and the connecting head is located in the first connecting groove.

[0011] In some embodiments of the present application, the first connecting groove includes a first sub-groove and a second sub-groove, the first sub-groove extends in a direction away from the optical film layer, and the second sub-groove is located between the first sub-groove and the bottom frame and is connected to the second sub-groove; the connecting head includes a plug and a clamp, the clamp is connected to the side of the plug facing the bottom frame, the plug is located in the first sub-groove, and the clamp is located in the second sub-groove.

[0012] In some embodiments of the present application, the main body portion and the light shielding portion are connected by integral injection molding through the first connecting groove.

[0013] In some embodiments of the present application, the shading portion extends from a side of the optical film layer toward the main body and is located on a side of the main body away from the bottom frame.

[0014] In some embodiments of the present application, a second connecting groove is provided on the side of the main body facing away from the bottom frame, and a protrusion is provided on the side of the shading portion facing the main body, and the protrusion is snapped into the second connecting groove, or the protrusion is connected to the main body through the second connecting groove by injection molding.

[0015] In some embodiments of the present application, the surface of the light shielding portion is sticky.

[0016] In some embodiments of the present application, the light shielding portion has elastic properties.

[0017] In some embodiments of the present application, the surface of the main body portion is in an increasing reflection color, and the surface of the shading portion is in a decreasing reflection color.

[0018] In a second aspect, an embodiment of the present application provides a liquid crystal display device, comprising:

[0019] Frame;

[0020] The backlight module as described in the first aspect, wherein the backlight module is arranged in the outer frame;

[0021] The liquid crystal panel is arranged on the light-emitting side of the bottom frame module and is located inside the outer frame.

[0022] In summary, due to the adoption of the above technical solution, this application has at least the following beneficial effects:

[0023] The embodiments of the present application provide a backlight module and a liquid crystal display device, which are mainly achieved by setting a middle frame as a main body and a light shielding portion. The main body is equivalent to the middle frame in the related art, and mainly plays the role of supporting and providing an installation position, and the light shielding portion mainly plays a light shielding role, thereby preventing the light source emitted by the backlight module from being transmitted from the side of the optical film layer. In detail, the light shielding portion is mainly connected to the main body, and the light shielding portion extends toward the optical film layer, thereby forming a shielding on the gap defined between the optical film layer and the main body, having a light shielding effect, effectively preventing the light emitted by the light source in the backlight module from being emitted through the gap, and improving the problem of light leakage at the edge of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments are briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, but are not intended to limit the present application, wherein:

[0025] Figure 1 A schematic diagram of the structure of a liquid crystal display device provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of a backlight module provided in an embodiment of the present application;

[0027] Figure 3 for Figure 2 Schematic diagram of the structure of the middle frame;

[0028] Figure 4 A schematic diagram of the structure of another backlight module provided in an embodiment of the present application;

[0029] Figure 5 for Figure 4 Schematic diagram of the structure of the middle frame.

[0030] Description of reference numerals:

[0031] 1. Outer frame; 2. Backlight module; 21. Bottom frame; 22. Optical film layer; 23. Middle frame; 231. Main body; 2311. First connecting groove; 2312. Second connecting groove; 232. Shading portion; 2321. Connector; 2322. Protrusion; 24. Gap; 25. Light guide plate; 26. Reflector; 3. Liquid crystal panel; 31. Liquid crystal box; 32. First polarizer; 33. Second polarizer; 4. Glue. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not 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.

[0033] In the description of this application, it should be understood that the words "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description". Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, known structures and processes are not elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles disclosed in this application.

[0035] See also Figure 1 , an embodiment of the present application provides a liquid crystal display device, comprising:

[0036] Outer frame 1;

[0037] A backlight module 2, which is arranged in the outer frame 1;

[0038] The liquid crystal panel 3 is disposed on the light-emitting side of the backlight module 2 and is located inside the outer frame 1 .

[0039] The liquid crystal display device can be applied to electronic devices with display screens, such as mobile phones, desktop computers, and notebook computers.

[0040] Wherein, the liquid crystal panel 3 includes:

[0041] The liquid crystal box 31 is responsible for signal processing, pixel control, color correction and power management. The liquid crystal box 31 is arranged on the light-emitting side of the backlight module 2, and the liquid crystal box 31 has a plurality of liquid crystal molecules that can be flipped with electronic control;

[0042] The first polarizer 32 and the second polarizer 33 are arranged on the side of the liquid crystal box 31 facing the backlight module 2, and the second polarizer 33 is arranged on the side of the liquid crystal box 31 away from the backlight module 2. The first polarizer 32 and the second polarizer 33 are mainly used to adjust and filter light, enhance contrast and protect the liquid crystal box 31 to a certain extent.

[0043] Most of the liquid crystal display devices on the current market are backlight type liquid crystal display devices, and their working principle is to control the rotation of the liquid crystal molecules in the liquid crystal box 31 by applying a driving voltage, and refract the light of the backlight module 2 to produce a picture. Since the liquid crystal panel 3 itself does not emit light, it needs to rely on the light source provided by the backlight module 2 to display the image normally. Therefore, the backlight module 2 becomes one of the key components of the liquid crystal display device. The backlight module 2 is divided into two types: an edge-entry backlight module 2 and a direct-type backlight module 2 according to the different incident positions of the light source. The direct-type backlight module 2 is a light source such as a cathode fluorescent lamp (CCFL) or a light emitting diode (LED) arranged behind the liquid crystal panel 3 to directly form a surface light source to provide to the liquid crystal panel 3. The edge-entry backlight module 2 is a backlight LED light bar (Light bar) disposed at the edge of the middle frame 23 behind the side of the liquid crystal panel 3. The light emitted by the LED light bar enters the light guide plate 25 from the light entrance surface of the light guide plate 25 (LGP) on one side, and is emitted from the light exit surface of the light guide plate 25 after reflection and diffusion, and then passes through the optical film layer 22 to form a surface light source to provide to the liquid crystal panel 3. Whether it is an edge-entry backlight module 2 or a direct-type backlight module 2, when the backlight module 2 emits light, there is a gap between the backlight module 2 and the liquid crystal panel 3, and there is a light leakage path at the edge of the backlight module 2 in addition to the optical film layer 22 path for light transmission in the backlight module 2, resulting in the problem of light leakage at the edge of the backlight module 2. Finally, when the liquid crystal display device displays the picture, it will show the problem of bright edges at the edge, which seriously affects the user experience.

[0044] Based on this, see Figures 1 to 5 The present application provides a liquid crystal display device, which can effectively improve the situation where the edge of the liquid crystal display device is bright by improving the structure of the backlight module 2. The backlight module 2 includes:

[0045] Bottom frame 21;

[0046] The optical film layer 22 is disposed in the bottom frame 21;

[0047] The middle frame 23 is disposed on the bottom frame 21, and the edge of the optical film layer 22 is spaced apart from the middle frame 23;

[0048] The middle frame 23 includes a main body 231 and a shading portion 232 , wherein the main body 231 is disposed on the bottom frame 21 , and the shading portion 232 is connected to the main body 231 and extends toward the optical film layer 22 , so that the shading portion 232 blocks the gap 24 between the optical film layer 22 and the middle frame 23 .

[0049] The technical solution provided by the embodiment of the present application is mainly to set the middle frame 23 as a main body 231 and a light shielding part 232. The main body 231 is equivalent to the middle frame 23 in the related art, and mainly plays the role of supporting and providing an installation position, and the light shielding part 232 mainly plays a light shielding role, thereby preventing the light source emitted by the backlight module 2 from being transmitted from the side of the optical film layer 22. In detail, the light shielding part 232 is mainly connected to the main body 231, and the light shielding part 232 extends toward the optical film layer 22, so as to form a shielding effect on the gap 24 defined between the optical film layer 22 and the main body 231, and effectively prevent the light emitted by the light source in the backlight module 2 from being emitted through the gap 24, thereby improving the problem of light leakage at the edge of the backlight module 2.

[0050] See also Figure 2 and Figure 3 In some embodiments, a first connecting groove 2311 is provided on the side of the main body 231 facing the optical film layer 22, and a connecting head 2321 matching the shape of the first connecting groove 2311 is provided on the side of the shading portion 232 facing the main body 231, and the connecting head 2321 is located in the first connecting groove 2311. Through the cooperation of the connecting head 2321 and the first connecting groove 2311, the connection between the main body 231 and the shading portion 232 is more stable and firm. It should also be noted that the main body 231 and the shading portion 232 can be an integrally molded structure or a detachable structure. In this embodiment, integral molding is adopted, specifically, after the main body 231 is subjected to a first injection molding, a second injection molding is performed based on the first connecting groove 2311 to form the shading portion 232, thereby improving the structural strength and stability of the middle frame 23.

[0051] Furthermore, the first connecting groove 2311 includes a first sub-groove and a second sub-groove, the first sub-groove extends in a direction away from the optical film layer 22, the second sub-groove is located between the first sub-groove and the bottom frame 21 and communicates with the second sub-groove; the connecting head 2321 includes a plug and a clamp, the clamp is connected to the side of the plug facing the bottom frame 21, the plug is located in the first sub-groove, and the clamp is located in the second sub-groove. For details, please see Figure 2 and Figure 3Through the structural limitation of the above-mentioned first connecting groove 2311 and the connecting head 2321, the connecting head 2321 is in a barb shape, and correspondingly, the first connecting groove 2311 is also in a barb shape, that is, the connecting head 2321 and the first connecting groove 2311 both have an oblique shape to facilitate the close combination of the connecting head 2321 and the first connecting groove 2311.

[0052] Furthermore, the end of the shading portion 232 away from the main body 231 extends to between the optical film layer 22 and the first polarizer 32, and the first polarizer 32 and the optical film layer 22 form contact and compression on the shading portion 232, effectively preventing the optical film layer 22 from shifting during transportation or when other vibration conditions occur. A mouth glue 4 is also provided between the main body 231 and the liquid crystal box 31, and the mouth glue 4 is used to adhere and fix the main body 231 to the liquid crystal box 31, and one side of the mouth glue 4 extends to the shading portion 232 and is bonded to the shading portion 232, thereby improving the connection stability between the backlight module 2 and the liquid crystal panel 3.

[0053] In some embodiments, the side of the shading portion 232 away from the optical film layer 22 extends toward the main body 231 and is located on the side of the main body 231 away from the bottom frame 21, so that a part of the shading portion 232 can be located at the position originally used to set the mouth glue 4, replacing the mouth glue 4, so that the shading portion 232 can be located between the main body 231 and the liquid crystal box 31, playing the role of connecting the main body 231 and the liquid crystal box 31, reducing the setting process of the mouth glue 4 and the use of materials.

[0054] It should be noted that the surface of the light shielding portion 232 needs to be sticky in order to bond the liquid crystal box 31 to the main body 231. Of course, in addition to the sticky portion of the light shielding portion 232 between the liquid crystal box 31 and the main body 231, other surfaces of the light shielding portion 232 may also be sticky to improve the bonding stability between the light shielding portion 232 and other components. And, for another structural solution proposed in the aforementioned embodiment: the structural solution in which the connector 2321 cooperates with the first connecting groove 2311, the light shielding portion 232 is also suitable for the technical means of having a sticky surface.

[0055] For further information, see Figure 4 and Figure 5The main body 231 is provided with a second connection groove 2312 on the side facing away from the bottom frame 21, and the light shielding part 232 is provided with a protrusion 2322 on the side facing the main body 231, and the protrusion 2322 is snapped into the second connection groove 2312. With this technical solution, the main body 231 and the light shielding part 232 are detachably connected, and the specific connection method is snap connection. Alternatively, an integrated molding technical solution can be adopted, such as the protrusion 2322 is connected to the main body 231 through the second connection groove 2312 by injection molding, so that the main body 231 and the light shielding part 232 are integrally molded.

[0056] It should be noted that the shading portion 232 has elastic properties and is applicable to any embodiment of the present application. Its material can be silicone material or other soft elastic materials, without specific limitation. By utilizing the elastic properties of the shading portion 232, when the first polarizer 32 and the optical film layer 22 squeeze the shading portion 232, it will not be damaged due to the hardness of the shading portion 232, and the position of the first polarizer 32 and the optical film layer 22 can be more fixed, effectively avoiding the displacement of the optical film layer 22. Similarly, for some embodiments, a portion of the shading portion 232 will extend between the liquid crystal box 31 and the main body 231. This portion of the shading portion 232 can also protect the surface of the main body 231 and the surface of the liquid crystal box 31 and improve the fixing stability of the main body 231 and the liquid crystal box 31, effectively avoiding the displacement of the liquid crystal box 31.

[0057] In some embodiments, the surface of the main body 231 is a reflective color, and the surface of the shading portion 232 is a subtractive color. The reflective color refers to a color that can enhance the reflectivity, and the subtractive color refers to a color that can reduce the reflectivity. In this embodiment, the surface of the main body 231 is preferably white to achieve as much light reflection as possible, which is beneficial to improving the brightness of the backlight module 2 when emitting light; the surface of the shading portion 232 is preferably light gray, so that it can play a shading role without generating dark bands. The dark band refers to the shading portion 232 using a color with a high light absorbance, such as black, which causes part of the shading portion 232 to be black, and the color difference with the part close to the middle of the edge is more obvious, and the black edge phenomenon appears when the backlight module 2 emits light or the liquid crystal display device displays the picture.

[0058] In some embodiments, see Figure 2 or Figure 4The backlight module 2 further includes a light guide plate 25, a light source (not shown in the figure) and a reflective sheet 26. The light source is an LED light bar, which is arranged on the side of the main body 231 of the middle frame 23 facing the optical film layer 22, and is used to emit light; the reflective sheet 26 is arranged in the bottom frame 21 and is located on the light-emitting side of the light source; the light guide plate 25 is arranged in the bottom frame 21 and is located on the light-emitting side of the light source, and receives the light emitted from the light source. After being reflected by the reflective sheet 26 and diffused by the light guide plate 25, the light is emitted from the light-emitting surface of the light guide plate 25, and then passes through the optical film layer 22 to form a surface light source to be provided to the liquid crystal panel 3.

[0059] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0060] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0061] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

Claims

1. A backlight module, characterized in that: include: Bottom frame; An optical film layer is arranged in the bottom frame; A middle frame is provided on the bottom frame, and an edge of the optical film layer is spaced apart from the middle frame; The middle frame includes a main body and a shading portion, the main body is arranged on the bottom frame, the shading portion is connected to the main body and extends toward the optical film layer so that the shading portion blocks the gap between the optical film layer and the middle frame.

2. The backlight module according to claim 1, characterized in that: A first connecting groove is formed on a side of the main body facing the optical film layer, and a connecting head matching the shape of the first connecting groove is formed on a side of the light shielding portion facing the main body, and the connecting head is located in the first connecting groove.

3. The backlight module according to claim 2, characterized in that: The first connecting groove includes a first sub-groove and a second sub-groove, the first sub-groove extends in a direction away from the optical film layer, and the second sub-groove is located between the first sub-groove and the bottom frame and is connected to the second sub-groove; the connecting head includes a plug and a clamp, the clamp is connected to the side of the plug facing the bottom frame, the plug is located in the first sub-groove, and the clamp is located in the second sub-groove.

4. The backlight module according to claim 2, wherein: The main body and the light shielding portion are connected through the first connecting groove by integral injection molding.

5. The backlight module according to claim 1, wherein: The light shielding portion extends from a side of the optical film layer toward the main body and is located at a side of the main body away from the bottom frame.

6. The backlight module according to claim 5, characterized in that: A second connecting groove is provided on a side of the main body away from the bottom frame, and a protrusion is provided on a side of the shading portion facing the main body. The protrusion is snapped into the second connecting groove, or the protrusion is connected to the main body through the second connecting groove by injection molding.

7. The backlight module according to claim 5, characterized in that: The surface of the light shielding portion is sticky.

8. The backlight module according to any one of claims 1 to 7, characterized in that: The light shielding portion has elastic properties.

9. The backlight module according to claim 8, characterized in that: The surface of the main body is in an increasing reflection color, and the surface of the light shielding part is in a decreasing reflection color.

10. A liquid crystal display device, characterized in that: include: Frame; The backlight module according to any one of claims 1 to 9, wherein the backlight module is arranged in the outer frame; The liquid crystal panel is arranged on the light-emitting side of the bottom frame module and is located inside the outer frame.

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