Combined reflector plate, direct type backlight module and display device

Abstract

A combined reflector plate comprises at least two reflector plates, each reflector plate comprises a plurality of reflector cups, the reflector cups are adjacent to each other and arranged in an array, the two adjacent reflector plates are respectively a first reflector plate and a second reflector plate, a part of the reflector cups in the first reflector plate are provided with embedding parts, and the second reflector plate is provided with embedding parts. Part of the reflection cups in the second reflection sheet are provided with embedding openings corresponding to the embedding parts, and the embedding parts are clamped in the corresponding embedding openings. The invention further provides a direct type backlight module comprising the combined reflector plate and a display device comprising the direct type backlight module.

Description

Combined reflective sheet, direct-type backlight module and display device

[0001] This application claims the priority of Chinese patent application No. 202310807973.5 filed on July 3, 2023, and entitled “Combined reflective sheet, direct-type backlight module and display device”, all contents of which are hereby incorporated by reference into this application.

[0002] The present invention generally relates to a combined reflective sheet, and more particularly to a combined reflective sheet for a direct-type backlight module and a display device using the direct-type backlight module.

[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 that use display panels in large quantities. 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 installed thereon. As the name suggests, 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 set to reflect the light emitted by the light-emitting component to the light-emitting surface and a diffusion plate is set to even out the light. In the conventional technology, the above-mentioned reflector will have a plurality of reflective cup structures to reflect the light emitted by the corresponding light sources, and these reflective cups are usually assembled by overlapping and fixed with tape.

[0005] In response to market trends, the demand for large-sized direct-type backlight modules has increased, and multiple reflective sheets must be arranged side by side to meet the demand for large-sized direct-type backlight modules. However, when conventional reflective sheets are arranged side by side, they must be attached with tape, which not only increases the cost of the tape, but also consumes additional costs and man-hours. If the aforementioned large-sized direct-type backlight module is applied to automotive displays, it is also easy to produce optical problems caused by poor attachment after high temperature and high humidity challenge tests.

[0006] Summary of the invention

[0007] In view of the above-mentioned shortcomings of the conventional technology, the present invention proposes a novel combined reflector, which is characterized in that the reflector cup structure constituting the reflector has an interlocking portion, which can be engaged with the corresponding interlocking opening. The assembly is simple and can be fixed without the use of tape, which can save costs and work hours.

[0008] One aspect of the present invention is to provide a combined reflector sheet, comprising at least two reflectors, each of which comprises a plurality of reflector cups, wherein the plurality of reflector cups are adjacent to each other and arranged in an array, wherein the two adjacent reflectors are a first reflector sheet and a second reflector sheet, respectively, a portion of the reflector cups in the first reflector sheet has an engaging portion, and a portion of the reflector cups in the second reflector sheet has an engaging opening corresponding to the engaging portion, and the engaging portion is engaged in the corresponding engaging opening.

[0009] Another aspect of the present invention is to provide a direct-type backlight module, comprising the above-mentioned combined reflective sheet, a bottom frame, a lamp board located on the bottom frame, the lamp board having a plurality of light-emitting components arranged in an array, at least one optical film mounted on the reflective sheet, and a top frame located on the optical film, wherein the combined reflective sheet is adjacently arranged on the lamp board, the light-emitting components are located in the reflective cups, and the reflective cups reflect light emitted by the light-emitting components.

[0010] Another aspect of the present invention is to provide a display device, comprising the above-mentioned direct-type backlight module and a display panel disposed above the direct-type backlight module, which can achieve the purpose of improving optical quality.

[0011] These and other objects of the present invention will become more apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings.

[0012] 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 present invention. These drawings depict some embodiments of the present invention and explain its principles together with the description of this document, in which:

[0013] FIG1 is a perspective schematic diagram of a reflective sheet with an interlocking portion according to an embodiment of the present invention;

[0014] FIG2 is a perspective schematic diagram of a reflective sheet with an interlocking opening according to an embodiment of the present invention;

[0015] 3 is a cross-sectional schematic diagram of two reflective sheets assembled through an interlocking portion and an interlocking opening according to an embodiment of the present invention;

[0016] FIG4 is a perspective schematic diagram of a reflective sheet with an interlocking portion according to another embodiment of the present invention;

[0017] FIG5 is a perspective schematic diagram of a reflective sheet with an interlocking opening according to another embodiment of the present invention;

[0018] 6 is a three-dimensional schematic diagram of two reflective sheets assembled through the interlocking portion and the interlocking opening according to another embodiment of the present invention;

[0019] 7 is a three-dimensional schematic diagram of a plurality of reflector cup structures according to another embodiment of the present invention, which are assembled and arranged in an array through the interlocking portions and interlocking openings;

[0020] FIG8 is a three-dimensional schematic diagram of a plurality of reflector cup structures according to another embodiment of the present invention, which are assembled and arranged in an array through staggered interlocking portions and interlocking openings; and

[0021] FIG. 9 is a schematic cross-sectional view of a direct-lit backlight module according to an embodiment of the present invention.

[0022] It should be noted that all the drawings in this specification are of a legend nature. For the sake of clarity and convenience in describing the drawings, the components in the drawings may be exaggerated or reduced in size and proportion. Generally speaking, the same figure marks in the drawings are used to indicate corresponding or similar component features after modification or in different embodiments.

[0023] Exemplary embodiments of the present invention will be described in detail below, and the features described will be illustrated with reference to the accompanying drawings so that those skilled in the art can understand and achieve technical effects. Those skilled in the art will appreciate 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.

[0024] Those skilled in the art should be able to easily understand that the meanings of "on", "over" 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).

[0025] 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 component or feature to another component or features, as shown in the accompanying drawings.

[0026] 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.

[0027] 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.

[0028] The following embodiments will begin to illustrate the combined reflector sheet of the present invention, wherein at least two reflector sheets having reflector cup structures are assembled together through corresponding interlocking portions and interlocking openings. The reflector sheets having corresponding interlocking portions and interlocking openings and their assembled states will be illustrated in different stereoscopic diagrams so that those skilled in the art can have a more detailed understanding of the structure of the present invention.

[0029] Now please refer to FIG. 1, which is a three-dimensional schematic diagram of a first reflector with a fitting portion according to an embodiment of the present invention. As shown in FIG. 1, the first reflector 110 of the present invention comprises a plurality of reflector cups 111 and 112 (two reflector cups 111 and 112 in a part of the first reflector 110 are shown in the figure), each of the reflector cups 111 and 112 has a bottom plate 114 and a side wall 116 connected to the edge of the bottom plate 114, and the reflector cups 111 and 112 can be adjacent to each other through the side wall 116, and can be preferably arranged in an array on a horizontal plane. The bottom plate 114 of the reflector cup 112 has an opening 117, which is preferably located at the center of the bottom plate 114, and its function is to allow a light-emitting element to pass through the bottom plate 114 and enter the reflector cup 112, such as the light-emitting element 104 shown in FIG. 9, and the reflector cup 112 can reflect the light emitted by the light-emitting element 104. In one embodiment, a portion of the reflective cup 111 in the first reflective sheet 110 is a complete reflective cup, and another portion of the reflective cup 112 in the first reflective sheet 110 has a fitting portion 118, which is used to combine with another reflective sheet. In this embodiment, as shown in FIG. 1 , the fitting portion 118 of the reflective cup 112 extends from one edge of the bottom plate 114, which may be a snap-fit ​​structure, but the present invention is not limited thereto. In this embodiment, the edge of the bottom plate 114 where the fitting portion 118 is located does not have a side wall 116, but in other embodiments, it may also have a side wall 116, and the present invention is not limited thereto. The first reflective sheet 110 may be made of a material with high reflectivity and low transmittance, such as PET (polyethylene terephthalate), to reflect the light emitted by the light-emitting element.

[0030] Now please refer to FIG. 2, which is a three-dimensional schematic diagram of a second reflector with a fitting opening according to an embodiment of the present invention. As shown in FIG. 2, similarly, the second reflector 120 of the present invention includes a plurality of reflector cups 121 and 122 (two reflector cups in a part of the second reflector 120 are shown in the figure), each of the reflector cups 121 and 122 has a bottom plate 124 and a side wall 126 connected to the edge of the bottom plate 124, and the reflector cups 121 and 122 can be adjacent to each other through the side wall 126, and can be preferably arranged in an array on a horizontal plane. The bottom plate 124 of the reflector cup 122 has an opening 127, which is preferably located at the center of the bottom plate 124, and its function is to allow the light-emitting element to pass through the bottom plate 124 and enter the reflector cup 122. In this way, the reflector cup 122 can reflect the light emitted by these light-emitting elements. In one embodiment, a portion of the reflective cup 121 in the second reflective sheet 120 is a complete reflective cup, and unlike the first reflective sheet 110, another portion of the reflective cup 122 in the second reflective sheet 120 has an insertion opening 128. In this embodiment, as shown in FIG2 , the insertion opening 128 is located at one edge of the bottom plate 124 of the reflective cup 122, such as the junction of the bottom plate 124 and the side wall 126, and its position corresponds to the insertion portion 118 extending from one edge of the bottom plate 114 shown in FIG1 , and its size and shape can achieve a snap-fit ​​function after being assembled in the insertion portion 118, such as the slit structure shown in FIG2 (but not limited thereto). The second reflective sheet 120 can also be made of a material with high reflectivity and low transmittance, such as PET, to reflect the light emitted by the light-emitting element.

[0031] Now please refer to FIG. 3, which is a cross-sectional schematic diagram of the first reflector 110 and the second reflector 120 assembled through the interlocking portion 118 and the interlocking opening 128 according to an embodiment of the present invention. As shown in FIG. 3, the reflector cup 112 of the first reflector 110 is stacked on the reflector cup 122 of the second reflector 120, and the side wall 116 of the reflector cup 112 of the first reflector 110 and the side wall 126 of the reflector cup 122 of the second reflector 120 may not completely overlap. As shown in FIG. 3, the position where the interlocking portion 118 of the first reflector 110 is located does not have a side wall structure that overlaps with the side wall 126 of the second reflector 120. As shown in FIG. 3, the interlocking portion 118 of the first reflector 110 can pass through the interlocking opening 128 from the reflector cup 122 of the second reflector 120 to the outside and engage with it, so as to achieve the positioning and limiting of the mechanism, which has a positioning effect in both the horizontal and vertical directions. The openings 117 and 127 on the overlapping reflective cups 112 and 122 overlap each other, so that the light-emitting element can enter the reflective cup 112 through the bottom plate 114 and the bottom plate 124. The opening 117 of the upper reflective cup 112 is preferably larger than the opening 127 of the lower reflective cup 122, so that the upper reflective cup 112 can avoid blocking the light of the light-emitting element.

[0032] Please refer to FIG. 4 , which is a three-dimensional schematic diagram of a first reflector with a fitting portion according to another embodiment of the present invention. As shown in FIG. 4 , the first reflector 110 of this embodiment includes a plurality of reflector cups 111 (a reflector cup 111 of a part of the first reflector 110 is shown in the figure), each reflector cup 111 has a bottom plate and a side wall 116 connected to the edge of the bottom plate, and the reflector cups 111 can be adjacent to each other through the side wall 116, and can preferably be arranged in an array on a horizontal plane. The reflector cups 111 located in the edge area of ​​the first reflector 110 have a fitting portion 118. Different from the embodiment of FIG. 1 , as shown in FIG. 4 , the fitting portion 118 of this embodiment extends from the edge of one of the side walls 116 of the reflector cup 111, which can be a snap-fit ​​structure, but the present invention is not limited thereto. In this embodiment, the engaging portion 118 is located on an extending portion 118a extending from the side wall 116 of the reflector cup 111. The shape of the extending portion 118a is conformal to the side wall 116 of the reflector cup 122 to which it is assembled, which helps to firmly overlap the first reflector sheet 110 with the second reflector sheet 120.

[0033] Now please refer to FIG. 5, which is a three-dimensional schematic diagram of a second reflector with an insertion opening according to another embodiment of the present invention. As shown in FIG. 5, similarly, the second reflector 120 of the present invention includes a plurality of reflector cups 122 (two reflector cups 121 and 122 of a part of the second reflector 120 are shown in the figure), each of the reflector cups 121 and 122 has a bottom plate and a side wall 126 connected to the edge of the bottom plate, and the reflector cups 122 can be adjacent to each other through the side wall 126, and can preferably be arranged in an array on a horizontal plane. Different from the embodiment of FIG. 2, as shown in FIG. 5, the insertion opening 128 of this embodiment is located on the side wall 126, and its position corresponds to the insertion portion 118 extending from the edge of the side wall 116 of the reflector cup 111, rather than being located at the junction of the side wall 126 and the bottom plate.

[0034] Now please refer to FIG. 6, which is a three-dimensional schematic diagram of the first reflector 110 and the second reflector 120 assembled through the engaging portion 118 and the engaging opening 128 according to another embodiment of the present invention. As shown in FIG. 6, the extension portion 118a extending from the edge of the side wall 116 of the first reflector 110 can overlap the side wall 126 of the second reflector 120. In this way, the engaging portion 118 of the first reflector 110 can extend from the side wall 116 of the reflector cup 111 to the inner surface of the side wall 126 of the second reflector 120, and be engaged in the engaging opening 128 on the side wall 126. This design can also achieve positioning and limiting effects in both the horizontal and vertical directions.

[0035] In another embodiment, the embedding portion 118 of the reflector cup 111 in the first reflector sheet 110 may also extend directly from the edge of the side wall, and the embedding openings 128 are provided on the ridges of the two connected side walls 116 of the two adjacent reflector cups 121 of the second reflector sheet 120, and the embedding portion 118 may be inserted into the embedding opening 128 between the two connected side walls 116. In this way, the embedding portion 118 may be hidden between the two adjacent reflector cups 121, and the complete reflective surface of each reflector cup may be maintained.

[0036] Now please refer to FIG. 7, which is a three-dimensional schematic diagram of a plurality of reflector cup structures in the aforementioned embodiment assembled and arranged in an array through an interlocking portion and an interlocking opening. As shown in FIG. 7, the combined reflector sheet of the present invention is assembled from a first reflector sheet 110 and a second reflector sheet 120. The first reflector sheet 110 and the second reflector sheet 120 respectively include a plurality of reflector cups 111 and 122, which are adjacent to each other and arranged in an array, wherein the reflector cup 111 of the first reflector sheet 110 has an interlocking portion 118, and the reflector cup 122 of the second reflector sheet 120 has an interlocking opening 128 corresponding to the interlocking portions 118, and after assembly, the interlocking portions 118 are engaged in the corresponding interlocking openings 128.

[0037] In other embodiments, the reflector sheet may also have both the interlocking portion 118 and the interlocking opening 128. For example, as shown in FIG8 , it is a three-dimensional schematic diagram of a plurality of reflector cup structures in another embodiment of the present invention assembled and arranged in an array through interlaced interlocking portions and interlocking openings. The first reflector sheet 110 may be designed such that the reflector cup 112 having the interlocking opening 128 and the reflector cup 112 having the interlocking portion 118 are interlaced, and the second reflector sheet 120 may be designed such that the reflector cup 122 having the interlocking opening 128 and the reflector cup 122 having the interlocking portion 118 are interlaced and arranged complementary to the first reflector sheet 110. In this way, the first reflector sheet 110 and the second reflector sheet 120 may achieve a further snap-on effect after being assembled.

[0038] In summary of the above embodiments, the advantage of the present invention is that the reflector is assembled by means of a structural design in which the engaging portion and the engaging opening on the reflector correspond to each other. Compared with the conventional technology, the assembly is simple and does not require the use of tape to fix it, thereby saving costs and work hours. Therefore, the present invention is an invention concept that is both novel and progressive.

[0039] Now please refer to FIG. 9, which is a cross-sectional schematic diagram of a direct-type backlight module according to an embodiment of the present invention. The combined reflective sheet described in the above embodiment can be applied to a direct-type backlight module. As shown in FIG. 9, the direct-type backlight module proposed by the present invention generally includes a back frame 100, a lamp board 102, a combined reflective sheet, a diffuser 106, and a top frame 108. 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 lamp board 102 is arranged on the back frame 100, and has a plurality of light-emitting elements 104 arranged in an array to provide light. In an embodiment of the present invention, the lamp board 102 can be a printed circuit board, and the light-emitting element 104 arranged thereon can be a light-emitting diode (LED), but the present invention is not limited thereto. The combined reflective sheet includes the aforementioned first reflective sheet 110 and the second reflective sheet 120, which are arranged on the lamp board 102, and the light-emitting element 104 on the lamp board 102 can enter the reflective cups 112 and 122 through the opening of the reflective sheet. The diffuser 106 is mounted on the back frame 100, and its function is to further homogenize the light through the particles evenly distributed inside it, so that the emitted light is more uniform. Other optical films, such as color conversion films and prism films, can also be arranged on the diffuser 106, but the present invention is not limited thereto. The top frame 108 can be a plate made of a relatively rigid material such as metal or plastic, which has a predetermined mechanical strength and supporting force, and can sandwich the first reflective sheet 110 and the second reflective sheet 120 with the diffuser 106 together with the back frame 100.

[0040] In addition to the aforementioned combined reflective sheet and the direct-type backlight module using the combined reflective sheet, the present invention also proposes a display device 130, as shown in FIG. 9 , which includes the aforementioned direct-type backlight module and a display panel 132, which is arranged above the direct-type backlight module, thereby achieving the purpose of improving the optical quality.

[0041] When applied to automotive displays, multiple reflective sheets can be expanded and assembled to have high adaptability to any size. The interlocking design used in the present invention can not only remove the adhesive or tape to reduce the tape cost, but also avoid the debonding problem after the conventional challenge test.

[0042] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the protection scope of the present invention should fall within the scope of the present invention.

[0043] [List of reference numerals] 100 back frame 102 light board 104 light emitting element 106 diffusion plate 108 top frame 110 first reflection sheet 111 reflection cup 112 reflection cup 114 bottom plate 116 side wall 117 opening 118 fitting portion 118a extension portion 120 second reflection sheet 121 reflection cup 122 reflection cup 124 bottom plate 126 side wall 127 opening 128 fitting opening 130 display device 132 display panel

Claims

A combined reflector sheet comprises: at least two reflectors, each of which comprises a plurality of reflector cups, wherein the plurality of reflector cups are adjacent to each other and arranged in an array; wherein: The two adjacent reflection sheets are respectively a first reflection sheet and a second reflection sheet, a part of the reflection cups in the first reflection sheet has an embedding portion, a part of the reflection cups in the second reflection sheet has an embedding opening corresponding to the embedding portion, and the embedding portion is engaged in the corresponding embedding opening. The combined reflective sheet according to claim 1, wherein: Each reflective cup has a bottom plate and a side wall, wherein the side wall is connected to the edge of the bottom plate. The combined reflective sheet according to claim 2, wherein: The embedding portion of the first reflector extends from the side wall of the reflector cup of the first reflector and overlaps the side wall of the second reflector, and the embedding opening of the second reflector is located on the side wall, and the embedding opening of the second reflector corresponds to the embedding portion of the first reflector. The combined reflective sheet according to claim 2, wherein: The embedding portion of the first reflective sheet extends from an edge of the bottom plate. The combined reflective sheet according to claim 4, wherein: The reflector cup of the first reflector is stacked on the reflector cup of the second reflector, the side wall of the first reflector does not completely overlap with the side wall of the second reflector, and the mating opening of the second reflector is located at the junction of the bottom plate and the side wall of the second reflector, and the mating opening of the second reflector corresponds to the mating portion of the first reflector. The combined reflective sheet according to claim 1, wherein: A portion of the reflector cups in the first reflector sheet has an embedding opening, and a portion of the reflector cups in the second reflector sheet has an embedding portion corresponding to the embedding opening of the first reflector sheet. The reflector cups with the embedding opening and the reflector cups with the embedding portion in the first reflector sheet are arranged in an alternating manner, and the reflector cups with the embedding opening and the reflector cups with the embedding portion in the second reflector sheet are arranged in an alternating manner. A direct-type backlight module, comprising: a combined reflective sheet according to any one of claims 1 to 6; a bottom frame; a light board located on the bottom frame, the light board having a plurality of light-emitting elements arranged in an array; at least one optical film mounted on the reflective sheet, and a top frame located on the optical film; wherein, The combined reflective sheets are adjacently arranged on the lamp board, the light emitting components are located in the reflective cups, and the plurality of reflective cups reflect light emitted by the plurality of light emitting components. A display device comprises: the direct-type backlight module according to claim 7; and a display panel arranged above the direct-type backlight module.

Images