Direct type backlight module capable of improving peripheral brightness and display device

Abstract

The utility model relates to a direct type backlight module capable of improving peripheral brightness and a display device, and the direct type backlight module capable of improving peripheral brightness comprises a back frame which is provided with a bottom plate and a side wall surrounding the edge of the bottom plate; the lamp panel is positioned on the bottom plate and is provided with a plurality of light-emitting parts which are arranged in an array form; the reflection sheet is located on the lamp panel and provided with a plurality of reflection cups, the reflection cups are adjacent to one another and arranged in an array mode, the bottom face of each reflection cup is provided with an opening, and the light-emitting pieces are located in the openings; the side wall is arranged on the bottom plate, the diffuser plate is arranged on the side wall, the reflector plate further comprises a plurality of protruding parts, each protruding part is higher than the side wall and extends in the direction away from the bottom plate, and the bottom face of each protruding part abuts against the top of the side wall.

Description

[0001] This application claims the priority of Chinese patent application No. 202310761269.0 filed on June 26, 2023, and entitled “Direct-type backlight module and display device capable of improving peripheral brightness”, all contents of which are hereby incorporated by reference into this application. Technical Field

[0002] The utility model generally relates to a direct-type backlight module, and more specifically, to a direct-type backlight module capable of improving peripheral brightness and a display device using the direct-type backlight module. Background Art

[0003] Display panels and panel display devices using display panels have gradually become the mainstream of various display devices. For example, various panel display screens, household flat-screen TVs, flat-panel monitors for personal computers and laptop computers, mobile phones and digital camera displays, etc., are all products using display panels. In particular, the market demand for liquid crystal display devices has grown significantly in recent years. In order to meet the requirements of liquid crystal display devices in terms of function and appearance, the design of backlight modules used in liquid crystal display devices has also become increasingly diversified.

[0004] The common backlight modules in the market can be generally divided into two types: side-entry type and direct-down type according to the difference in the incident position of the light source, so as to provide a uniform surface light source to the liquid crystal display module arranged thereon. As the name implies, the direct-down backlight module has a light source (such as LED chips or cold cathode fluorescent lamps CCFL) incident from the bottom surface of the panel, and a reflector is provided to reflect the light source emitted by the light-emitting component to the light-emitting surface, and a diffusion plate is provided to uniformly distribute the light source. However, in the conventional technology, light is easily absorbed in the diffusion plate bearing area around the panel, resulting in a decrease in brightness, especially at the edge or corner of the light-emitting surface of the backlight module, thereby reducing the global uniformity of its surface scan (area scan) during detection, affecting the image quality that the panel can provide. Utility Model Content

[0005] In view of the problems encountered in the aforementioned conventional technology, the utility model proposes a novel backlight module structure, which is characterized in that a reflective sheet in the backlight module is provided with a raised portion near the periphery to reflect light, thereby preventing the light from being absorbed at the periphery of the backlight module and causing a decrease in the brightness and global uniformity (area scan) or light output uniformity of the panel, and the raised portion of the reflective sheet can be used to position the diffuser disposed thereon.

[0006] The utility model aims to provide a direct-type backlight module capable of improving peripheral brightness, comprising a back frame having a bottom plate and a side wall surrounding the edge of the bottom plate; a lamp board located on the bottom plate, the lamp board having a plurality of light-emitting elements arranged in an array; a reflective sheet located on the lamp board, the reflective sheet comprising a plurality of reflective cups, the plurality of reflective cups being adjacent to each other and arranged in an array, the bottom surface of each of the reflective cups having an opening, the light-emitting element being located in the opening, the reflective cup being used to reflect light emitted by the plurality of light-emitting elements; and a diffuser disposed on the side wall; wherein the reflective sheet further comprises a plurality of protrusions, each of the protrusions being higher than the side wall and extending in a direction away from the bottom plate, the bottom surface of each of the protrusions being against the top of the side wall.

[0007] The utility model further provides a display device, comprising: the direct-type backlight module capable of improving peripheral brightness as described above; and a display panel, which is arranged above the direct-type backlight module capable of improving peripheral brightness.

[0008] The direct-type backlight module of the utility model which can improve the peripheral brightness uses a protrusion higher than the side wall to be set at the edge or corner of the reflective sheet, which helps to reflect the light at the position where shadows are likely to be generated to the optical film above, so as to achieve the effect of improving the brightness, uniformity of the entire area or uniformity of light output.

[0009] These and other objects of the present invention will become more apparent after the detailed description of the preferred embodiments described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings constitute a part of this specification so that those skilled in the art can have a further understanding of the embodiments of the utility model. These drawings depict some embodiments of the utility model and illustrate the principles thereof together with the description herein, wherein:

[0011] Figure 1 It is a cross-sectional schematic diagram of a direct-lit backlight module capable of improving peripheral brightness according to an embodiment of the utility model;

[0012] Figure 2 It is a cross-sectional enlarged schematic diagram of a corner portion of a direct-lit backlight module capable of improving peripheral brightness according to an embodiment of the utility model;

[0013] Figure 3 is a three-dimensional enlarged schematic diagram of a corner portion of a direct-lit backlight module capable of improving peripheral brightness according to an embodiment of the utility model; and

[0014] Figure 4 It is a schematic plan view of a diffusion plate of a direct-type backlight module capable of improving peripheral brightness according to an embodiment of the utility model.

[0015] It should be noted that all figures in this specification are of a legend nature. For the sake of clarity and convenience in describing the figures, the components in the figures may be exaggerated or reduced in size and proportion. Generally speaking, the same figure marks in the figures are used to indicate corresponding or similar component features after modification or in different embodiments. DETAILED DESCRIPTION

[0016] The following will describe in detail exemplary embodiments of the present invention, which will refer to the accompanying drawings to illustrate the described features so that those skilled in the art can understand and achieve technical effects. Those skilled in the art will understand that the description herein only illustrates the present invention by way of example, rather than limiting the present invention. Various embodiments of the present application and various features that do not conflict with each other in the embodiments may be combined or reset in various ways. Without departing from the spirit and scope of the present invention, modifications, equivalents or improvements to the present application are understandable to those skilled in the art and are intended to be included within the scope of the present application.

[0017] Those skilled in the art should be able to easily understand that the meanings of "on", "on" and "above" in the present invention should be interpreted in a broad manner, so that "on" not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers, and "on" or "above" not only means "on" or "above" something, but also includes the meaning of being "on" or "above" something with no intervening features or layers (i.e., directly on something).

[0018] In addition, spatially related terms such as "under," "beneath," "lower," "over," "upper," and the like are intended for convenience in describing the relationship of one element or feature to another element or features, as shown in the accompanying drawings.

[0019] Those skilled in the art can generally understand terms, at least in part, from usage in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Similarly, depending at least in part on the context, terms such as "a", "an", "the", or "said" can also be understood to convey singular usage or to convey plural usage. In addition, the term "based on" can be understood to not necessarily be intended to convey an exclusive set of factors, but can allow for the presence of additional factors that are not necessarily explicitly described, which also depends at least in part on the context.

[0020] Those skilled in the art will further understand that when words such as "include" and / or "contain" are used in this specification, they define the existence of the stated features, regions, wholes, steps, operations, elements and / or parts, but do not exclude the possibility of the existence or addition of one or more other features, regions, wholes, steps, operations, elements, parts and / or combinations thereof.

[0021] Now please refer to Figure 1 , which is a cross-sectional schematic diagram of a direct-type backlight module capable of improving peripheral brightness according to an embodiment of the utility model. Figure 1 As shown, the direct-type backlight module proposed in the utility model generally includes a back frame 100, a light board 102, a reflective sheet 106 and a diffuser 110. The back frame 100 can be a plate made of a rigid material such as metal, which has a predetermined mechanical strength and supporting force. The light board 102 is arranged on the back frame 100, and has a plurality of light-emitting components 104 arranged in an array to provide light. In an embodiment of the utility model, the light board 102 can be a printed circuit board, and the light-emitting components 104 arranged thereon can be light-emitting diodes (LEDs), but the utility model is not limited thereto. The reflective sheet 106 is a three-dimensional reflective sheet, and is arranged on the peripheral parts of the light board 102 and the back frame 100. In an embodiment of the utility model, the reflective sheet 106 is made of a material with high reflectivity and low transmittance, such as PET (polyethylene terephthalate), to reflect the light emitted by the light-emitting component 104. The diffusion plate 110 is mounted on the back frame 100 , and its function is to further even out the light emitted by the light source through particles evenly distributed inside the diffusion plate 110 , so that the emitted light is more uniform.

[0022] For example, the portion of the reflective sheet 106 extending upward can be located at the periphery of the overall direct-type backlight module, such as a corner position or any edge position. In another embodiment, the portion of the reflective sheet 106 extending upward can also be applied to the edge position of a non-rectangular (irregular) direct-type backlight module. In the direct-type backlight module that can improve the peripheral brightness of the utility model, the portion of the reflective sheet 106 extending upward is used for the diffuser plate 110 to support, which can reduce the situation in which the light is easily absorbed by the diffuser plate 110 or other components in the direct-type backlight module. In other words, in the edge area or corner area where shadows are easily generated, the utility model uses the reflective function of the reflective sheet 106 to reflect the light upward to improve the brightness of the edge area or corner area, so as to achieve a better uniformity of the entire area or uniformity of light output.

[0023] Now please refer to Figure 2 , which is an enlarged cross-sectional schematic diagram of a corner portion of a direct-lit backlight module capable of improving peripheral brightness according to an embodiment of the present invention. As for the detailed features of the direct-lit backlight module capable of improving peripheral brightness of the present invention, Figure 2As shown, the back frame 100 has a bottom plate 100a and a side wall 100b surrounding the edge of the bottom plate 100a, thereby forming a receiving space S. The light board 102 is disposed on the bottom plate 100a of the back frame 100 and is located in the receiving space S, and the reflective sheet 106 is disposed on the light board 102 and the back frame 100. In the embodiment of the utility model, the reflective sheet 106 includes a plurality of reflective cups 106a, a positioning portion 106b, a base 106c, and a supporting wall 106d, wherein the plurality of reflective cups 106a are adjacent to each other and can be arranged in an array form (such as Figure 1 Furthermore, each reflector cup 106a has an opening 108 on its bottom surface, and the light emitting element 104 on the light board 102 can extend into the reflector cup 106a through the opening 108. The inclined side wall of the reflector cup 106a can reflect the light emitted by the light emitting element 104 toward the light emitting surface.

[0024] In the embodiment of the present invention, the portion of the reflective sheet 106 that is higher than the side wall 100b of the back frame 100 is defined as a raised portion of the reflective sheet 106, which includes a positioning portion 106b and a base portion 106c. Figure 2 As shown, the positioning portion 106b of the reflective sheet 106 is connected to the base portion 106c and extends and protrudes in a direction away from the bottom plate 100a of the back frame 100 (as shown in FIG. Figure 2 As shown in the figure, relative to the bottom plate 100a of the back frame 100, the base 106c of the reflective sheet 106 extends laterally toward the periphery of the bottom plate 100a, so that the bottom surface of the base 106c can abut against the top of the side wall 100b of the back frame 100. In addition, the supporting wall 106d of the reflective sheet 106 extends from the base 106c along the side wall 100b of the back frame 100 toward the bottom plate 100a. Through the above-mentioned base 106c and the supporting wall 106d, the reflective sheet 106 can abut against and be positioned on the side wall 100b of the back frame 100.

[0025] Please also refer to Figure 2 and Figure 3 The positioning portion 106b and the base portion 106c of the reflective sheet 106 are preferably located at the corners of the back frame 100, and the diffuser 110 is mounted on the side wall 100b of the back frame 100, separated by the reflective sheet 106. More specifically, in the embodiment of the present utility model, Figure 4 As shown, the diffuser 110 is provided with a notch 110a at a position (such as a corner of the back frame 100) corresponding to the protrusions (i.e., the positioning portion 106b and the base portion 106c), and the positioning portion 106b of the reflector 106 can be accommodated in the notch 110a, so that the diffuser 110 disposed thereon can be positioned. Figure 3As shown, the reflector 106 also has a platform portion 106e, which is located at a non-corner portion of the side wall 100b of the back frame 100 and extends laterally from the edge of the reflector 106 to the top surface of the side wall 100b. In this way, the brightness of the edge area can be improved by the reflector 106 located below the edge of the diffuser, thereby achieving a better uniformity of the entire area or uniformity of light output. The platform portion 106e of the reflector 106 is connected to the base 106c in the lateral direction, and the top surfaces of the two can be at the same height and flush. In an embodiment of the utility model, in the non-corner area of ​​the back frame 100, the diffuser 110 rests on the platform portion 106e of the reflector 106, and in the corner area of ​​the back frame 100, the diffuser 110 achieves a positioning effect with the corresponding positioning portion 106b of the reflector 106 through the notch 110a. In this way, the brightness of the edge area and the corner area can be improved by the reflective sheet 106 located below the edge of the diffuser, thereby achieving a better uniformity of the entire area or uniformity of light output. In other embodiments, the positioning portion 106b can also be formed on any side of the reflective sheet 106, and the side of the diffuser 110 corresponding to the positioning portion 106b can be formed with a notch 110a.

[0026] Continue to refer to Figure 2 . The direct-type backlight module of the utility model that can enhance the peripheral brightness also includes at least one optical film 112, which is disposed on the diffuser plate 110 and can also achieve a positioning effect through the positioning portion 106b of the reflective sheet 106. The optical film 112 may include a color conversion sheet and a prism sheet. The prism sheet can deflect light to the front viewing direction to achieve a light collection and brightening effect, and the color conversion sheet can convert the light waves emitted by the light-emitting element 104 to improve color reproducibility and durability, but the utility model is not limited to this. In an embodiment of the utility model, the top of the positioning portion 106b of the reflective sheet 106 can be flush with the surface of the optical film 112, so that a better assembly and fixing effect can be achieved. In addition, the direct-lit backlight module further includes a top frame 114, which can be a plate made of a rigid material such as metal or a plastic material with high structural strength, and has a predetermined mechanical strength and supporting force, and can sandwich the reflective sheet 106 and the diffuser 110 therebetween together with the back frame 100. In more detail, the top frame 114 covers the positioning portion 106b and the optical film 112 at the edge, and the side edge can be combined with the side wall 100b of the back frame 100, and sandwich the reflective sheet 106, the diffuser 110 and the optical film 112 therebetween.

[0027] In the four corners of the direct-type backlight module that can improve the peripheral brightness in the embodiment of the utility model, the reflective sheet is formed with four upwardly protruding positioning parts, which are used to block the light emitted from the side of the diffuser plate 110 or the optical film 112, which can effectively reduce the travel distance of the light, and the positioning parts with high reflectivity can reflect the light into the diffuser plate 110 or the optical film 112, thereby achieving 74% full-area uniformity. Compared with the 70% full-area uniformity of the conventional backlight module, this embodiment can improve the full-area uniformity by 4%. Accordingly, the utility model can indeed achieve the effect of improving the corner brightness and optimizing the full-area uniformity.

[0028] In summary, the advantage of the present invention over the prior art is that the reflective sheet is provided with an upwardly protruding positioning portion near the periphery of the back frame (e.g., edge or corner), and the positioning portion corresponds to the notch of the diffuser plate, so that not only the aforementioned positioning effect can be achieved, but also the light reflection efficiency at the edge or corner can be improved. In contrast, the reflective sheet of the prior art does not have a design of a corner protrusion, so the light at the corner of the backlight module of the prior art is easily absorbed at the corner, resulting in a decrease in the brightness and global uniformity (area scan) of the panel. Therefore, compared to the prior art, the present invention can indeed achieve the effect of improving the brightness of the corners and optimizing the uniformity of the entire area.

[0029] In addition to the above embodiments, the present invention also provides a display device such as Figure 1 As shown, it includes the direct-type backlight module capable of improving peripheral brightness and all its features as described in the above embodiment, and a display panel 116 disposed above the direct-type backlight module. Therefore, the display device of the utility model also has better uniformity in the entire area, and thus has better optical quality.

[0030] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of protection of the present invention should fall within the scope of coverage of the present invention.

[0031] [List of Reference Numerals]

[0032] 100 back frame

[0033] 100a base plate

[0034] 100b side wall

[0035] 102 light board

[0036] 104 luminous parts

[0037] 106 reflective sheet

[0038] 106a Reflection cup

[0039] 106b Positioning unit

[0040] 106c base

[0041] 106d Support wall

[0042] 106e Platform Department

[0043] 108 openings

[0044] 110 diffuser plate

[0045] 110a Notch

[0046] 112 optical film

[0047] 114 top frame

[0048] 116 Display Panel

[0049] S storage space.

Claims

1. A direct-type backlight module capable of improving peripheral brightness, characterized in that: Include: A back frame having a bottom plate and side walls surrounding the edge of the bottom plate; A light board, which is located on the bottom plate and has a plurality of light-emitting elements arranged in an array; A reflector sheet, which is located on the light board, and includes a plurality of reflector cups, which are adjacent to each other and arranged in an array, each of which has an opening on the bottom surface, and the light-emitting element is located in the opening, and the reflector cup is used to reflect the light emitted by the plurality of light-emitting elements; as well as a diffusion plate, which is arranged on the side wall; The reflective sheet further includes a plurality of protrusions, each of which is higher than the side wall and extends in a direction away from the bottom plate, and the bottom surface of each protrusion abuts against the top of the side wall.

2. The direct-lit backlight module capable of improving peripheral brightness according to claim 1, characterized in that: A notch is formed at a position of the diffusion plate corresponding to the protrusion, and the protrusion is accommodated in the notch.

3. The direct-lit backlight module capable of improving peripheral brightness according to claim 2, characterized in that: The reflection sheet further has a platform portion, which extends from an edge region of the reflection sheet to a top surface of the side wall, and is located between the diffusion plate and the side wall, and the diffusion plate rests on the platform portion.

4. The direct-lit backlight module capable of improving peripheral brightness according to claim 3, characterized in that: The raised portion includes a positioning portion and a base, the positioning portion is connected to the base, and the bottom surface of the base is against the top of the side wall, the positioning portion is accommodated in the notch, and the base is connected to the platform portion on a side facing the diffuser plate, and the diffuser plate is against the base and the platform portion.

5. The direct-lit backlight module capable of improving peripheral brightness according to claim 1, characterized in that: An optical film is also included, and the tops of the plurality of protrusions are flush with the surface of the optical film.

6. The direct-lit backlight module capable of improving peripheral brightness according to claim 5, characterized in that: A top frame is also included, and the top frame covers the edges of the plurality of protrusions and the optical film.

7. The direct-lit backlight module capable of improving peripheral brightness according to claim 1, characterized in that: The reflective sheet further includes a supporting wall, and the supporting wall extends from the protruding portion along the side wall of the back frame toward the bottom plate.

8. The direct-lit backlight module capable of improving peripheral brightness according to claim 1, characterized in that: The plurality of protrusions of the reflective sheet are located at corners of the back frame.

9. A display device, characterized in that: Include: A direct-lit backlight module capable of improving peripheral brightness according to any one of claims 1 to 8; and The display panel is arranged above the direct-type backlight module capable of improving peripheral brightness.

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