Backlight module and display device

Abstract

The utility model provides a kind of backlight module, it includes light source component, microstructure diffusion film, first prism sheet, second prism sheet and third prism sheet.Microstructure diffusion film has multiple microstructures and diffusion film substrate, these microstructures are set on at least one surface of diffusion film substrate.The surface of first prism sheet facing microstructure diffusion film has multiple first prism structures extending along first direction, the surface of second prism sheet away from first prism sheet has multiple second prism structures extending along second direction, the surface of third prism sheet away from second prism sheet has multiple third prism structures extending along third direction.The utility model also provides a kind of display device with the above-mentioned backlight module.The backlight module and display device proposed by the utility model can improve normal viewing angle luminance.

Description

Technical Field

[0001] This utility model relates to an optical module and an electronic device, and more particularly to a backlight module and a display device. Background Technology

[0002] A backlight module is used to provide backlight for a display device. Existing direct-lit backlight modules use a matrix arrangement of light-emitting diodes (LEDs) as the light source. Because LEDs have the strongest light emission intensity in the forward direction, they are prone to forming bright light above the LEDs, which is a hot spot phenomenon, resulting in a decrease in the uniformity of light emission from the light-emitting surface.

[0003] To address this issue, two high-haze diffusion films (e.g., haze of at least 80%) are typically used to diffuse the light emitted by multiple LEDs multiple times, thereby improving the hotspot phenomenon. However, the use of high-haze diffusion films increases the emission angle of the backlight module and reduces the brightness at the front viewing angle.

[0004] The "Background Art" paragraph is only used to help understand the content of this utility model. Therefore, the content disclosed in the "Background Art" paragraph may include some known technologies that are not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of this utility model were known or recognized by those skilled in the art before this utility model application. Utility Model Content

[0005] This utility model provides a backlight module and a display device that can improve hot spot phenomena and simultaneously enhance brightness at the normal viewing angle.

[0006] Other objects and advantages of this utility model can be further understood from the technical features disclosed herein.

[0007] To achieve one, some, or all of the above-mentioned objectives, or other objectives, an embodiment of the present invention provides a backlight module, comprising: a light source assembly, a microstructure diffusion film, a first prism sheet, a second prism sheet, and a third prism sheet. The light source assembly includes at least one substrate and a plurality of light-emitting units, the plurality of light-emitting units being arrayed on the at least one substrate. The microstructure diffusion film is disposed on one side of the light source assembly and has a plurality of microstructures and a diffusion film substrate. The diffusion film substrate includes a first surface and a second surface facing each other, and a plurality of microstructures are disposed on at least one of the first surface and the second surface. The first prism sheet is disposed on one side of the second surface of the microstructure diffusion film, and the surface of the first prism sheet facing the second surface of the microstructure diffusion film has a plurality of first prism structures, the plurality of first prism structures extending along a first direction. The second prism sheet is disposed on the side of the first prism sheet away from the microstructure diffusion film, and the surface of the second prism sheet away from the first prism sheet has a plurality of second prism structures, the plurality of second prism structures extending along a second direction, the angle between the first direction and the second direction being greater than or equal to 65 degrees and less than or equal to 90 degrees. The third prism is located on the side of the second prism away from the first prism. The surface of the third prism away from the second prism has multiple third prism structures. The multiple third prism structures extend along a third direction. The angle between the second direction and the third direction is greater than or equal to 80 degrees and less than or equal to 90 degrees.

[0008] To achieve one or more of the above objectives or other objectives, another embodiment of the present invention provides a display device, which includes: a backlight module and a display panel of the present invention, wherein the display panel is disposed on the backlight module.

[0009] Based on the above, the embodiments of this utility model have at least one of the following advantages or effects. In the design of the backlight module and display device in this embodiment, through the two-dimensional diffusion and light diffusion angle control of the microstructure diffusion film, the one-dimensional diffusion of the first prism sheet, and the light guiding design of the second and third prism sheets, the hot spot phenomenon is improved, and the efficiency of the backlight module is also improved (i.e., the brightness at the viewing angle is increased). In addition, by using blue light-emitting units and setting blue light transmission film and color conversion film, the brightness of the backlight module is improved, the color gamut performance is enhanced, and thus superior display performance is achieved.

[0010] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of an embodiment of the backlight module of this utility model;

[0012] Figure 2 for Figure 1Simulated diagram of the light emission angle distribution after the light emitted by the light-emitting unit passes through the microstructure diffusion film;

[0013] Figure 3 for Figure 1 A top view of the first, second, and third prisms;

[0014] Figure 4 for Figure 1 A simulation diagram of the light emission angle distribution after the light emitted by the light-emitting unit passes through the microstructure diffusion film and the first prism sheet;

[0015] Figure 5 To replace using two high-haze diffusion films Figure 1 Simulated diagram of the light emission angle distribution behind the microstructure diffusion film and the first prism sheet;

[0016] Figure 6 for Figure 1 A three-dimensional schematic diagram of an embodiment of the microstructure of the diffusion membrane;

[0017] Figure 7 for Figure 6 Top view;

[0018] Figure 8 for Figure 1 A three-dimensional schematic diagram of another embodiment of the microstructure of the diffusion membrane;

[0019] Figure 9 for Figure 8 Top view;

[0020] Figure 10 for Figure 1 A three-dimensional schematic diagram of an embodiment of a microstructured diffusion membrane;

[0021] Figure 11 This is a three-dimensional schematic diagram of an embodiment of the microstructure diffusion film of the backlight module of this utility model;

[0022] Figure 12 These are schematic cross-sectional views of various embodiments of the microstructure of the microstructure diffusion membrane of this utility model;

[0023] Figure 13 This is a partially enlarged schematic diagram of the first prism sheet of this utility model;

[0024] Figure 14 This is a partially enlarged schematic diagram of the second prism sheet of this utility model;

[0025] Figure 15 This is a partially enlarged schematic diagram of the third prism sheet of this utility model;

[0026] Figure 16 This is a schematic diagram of an embodiment of the display device of this utility model;

[0027] Figure 17 This is a schematic diagram of another embodiment of the backlight module of this utility model; and

[0028] Figure 18 This is a schematic diagram of another embodiment of the display device of this utility model. Detailed Implementation

[0029] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present utility model. It should be noted that some drawings are labeled with X, Y, and Z directions to show the arrangement relationship of the components in the drawings; the X, Y, and Z directions are orthogonal to each other, but this is not a limitation.

[0030] Figure 1 This is a schematic diagram of one embodiment of the backlight module of this utility model. Please refer to [link / reference]. Figure 1 The backlight module 100 of this embodiment includes a light source assembly 110, a microstructure diffusion film 120, a first prism sheet 130, a second prism sheet 140, and a third prism sheet 150. In this embodiment, the backlight module 100 is, for example, a direct-lit backlight module.

[0031] The light source assembly 110 includes at least one substrate 112 and a plurality of light-emitting units 114, the plurality of light-emitting units 114 being arrayed on the at least one substrate 112. The substrate 112 is adapted to electrically connect the plurality of light-emitting units 114. The substrate 112 is, for example, a circuit board, and its material includes, for example, a metal or alloy with good thermal conductivity; the light-emitting units 114 are, for example, light-emitting diodes (LEDs), mini light-emitting diodes (mini LEDs), micro LEDs, or other suitable light sources. Furthermore, in this embodiment, the light-emitting unit 114 can be a white light-emitting unit emitting white light. In one embodiment, the light source assembly 110 may further include a light source driver (not shown), which is electrically connected to the substrate 112 and adapted to individually (or in groups) control the light emission of the plurality of light-emitting units 114. The light source driver can be a separate driver or integrated into other drivers or processors.

[0032] In this embodiment, the number of substrates 112 may be one, and the shape of substrate 112 may be, for example, rectangular, while the plurality of light-emitting units 114 are arranged in a matrix at intervals, but this is not a limitation. In other embodiments, the number of substrates 112 may be multiple, and the shape of substrate 112 may be, for example, strip-shaped, while the plurality of light-emitting units 114 may be respectively disposed on the plurality of substrates 112. The number of substrates 112 and light-emitting units 114 can be adjusted and designed according to actual needs.

[0033] A microstructured diffusion film 120 is disposed on one side of the light source assembly 110 (i.e., the microstructured diffusion film 120 is disposed on one side of the light-emitting surface of the plurality of light-emitting units 114), and has a plurality of microstructures 122 and a diffusion film substrate 124. The diffusion film substrate 124 includes a first surface 124a and a second surface 124b facing each other. The first surface 124a faces the light source assembly 110, and the plurality of microstructures 122 are disposed on at least one of the first surface 124a and the second surface 124b. In this embodiment, the plurality of microstructures 122 are disposed on the first surface 124a of the diffusion film substrate 124, but this is not a limitation.

[0034] The microstructure diffusion film 120 has a two-dimensional diffusion effect, and the diffusion angle of the light emitted by the multiple light-emitting units 114 can be controlled by the arrangement of multiple microstructures 122 to improve the hot spot phenomenon. Specifically, the multiple microstructures 122 disperse the light emitted by the multiple light-emitting units 114 into multiple light spots, thus dispersing the emitted light, which was originally concentrated in the forward direction (e.g., emission angle of 0 degrees), to a larger emission angle, thereby improving the hot spot phenomenon (e.g., ...). Figure 2 As shown, Figure 2 for Figure 1 A simulation diagram of the light emission angle distribution after the light emitted by the light-emitting unit passes through the microstructure diffusion film. Figure 2 The darker the color, the higher the brightness.

[0035] The first prism sheet 130 is disposed on one side of the second surface 124b of the microstructure diffusion film 120. The first prism sheet 130 has a surface 132 facing the second surface 124b of the microstructure diffusion film 120, and a plurality of first prism structures 134 are disposed on the surface 132. The plurality of first prism structures 134 extend along the first direction F and are arranged parallel to each other. Therefore, in this embodiment, the first prism sheet 130 is, for example, a reverse prism sheet (the prism is disposed on the light-incident surface of the prism sheet). Wherein, the first direction F is the prism axis of the first prism structure 134 (e.g., the ridge line of the first prism structure 134); the first prism sheet 130 is used to perform one-dimensional diffusion in a single direction to further improve the hot spot phenomenon. In this embodiment, the first prism sheet 130 may include a first substrate 136, and a plurality of first prism structures 134 are disposed on the surface of the first substrate 136 facing the microstructure diffusion film 120 (e.g., surface 132 of the first prism sheet 130). The material of the first substrate 136 is, for example, polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polystyrene (PS), or polycarbonate (PC). The material of the plurality of first prism structures 134 may include ultraviolet-curable adhesive (UV glue) or other suitable photocurable polymers, thermosetting polymers, etc. In some other embodiments, the refractive index of the plurality of first prism structures 134 may be between 1.4 and 1.7. In other embodiments, the first substrate 136 and the plurality of first prism structures 134 may be made of the same material, and this invention is not particularly limited.

[0036] The second prism sheet 140 is disposed on the side of the first prism sheet 130 away from the microstructure diffusion film 120. The surface 142 of the second prism sheet 140 away from the first prism sheet 130 has a plurality of second prism structures 144. These multiple second prism structures 144 extend along a second direction S and are arranged parallel to each other. The angle θ1 between the first direction F and the second direction S is greater than or equal to 65 degrees and less than or equal to 90 degrees. Therefore, in this embodiment, the second prism sheet 140 is, for example, a positive prism (the prism is disposed on the light-emitting surface of the prism sheet). The second direction S is the prism axis of the second prism structure 144 (e.g., the ridge line of the second prism structure 144). Since the first prism sheet 130 can deflect light from the microstructure diffusion film 120 to a specific angular range, by designing the angle between the first direction F and the second direction S to be greater than or equal to 65 degrees and less than or equal to 90 degrees, light from the first prism sheet 130 within the specific angular range can be guided by the second prism sheet 140 to a specific viewing angle range.

[0037] In this embodiment, the angle θ1 between the first direction F and the second direction S can be equal to 90 degrees (i.e., the prism axis of the first prism structure 134 is orthogonal to the prism axis of the second prism structure 144, such as...). Figure 3 As shown, Figure 3 for Figure 1 A top view of the first, second, and third prisms is provided (the first prism structure 134 of the first prism 130 is drawn with dashed lines because it bulges in the negative Z direction), but this is not a limitation. Furthermore, the second prism 140 may include a second substrate 146, with multiple second prism structures 144 disposed on the surface of the second substrate 146 away from the first prism 130 (e.g., surface 142 of the second prism 140). The material of the second substrate 146 may be, for example, polyethylene terephthalate, polymethyl methacrylate, polystyrene, or polycarbonate. The material of the multiple second prism structures 144 may include UV-curable adhesives or other suitable photocurable polymers, thermosetting polymers, etc. In some other embodiments, the refractive index of the multiple second prism structures 144 may be between 1.4 and 1.7. In other embodiments, the second substrate 146 and the multiple second prism structures 144 may be made of the same material; this invention is not particularly limited.

[0038] The third prism 150 is disposed on the side of the second prism 140 away from the first prism 130 (i.e., the second prism 140 is disposed between the third prism 150 and the first prism 130). The surface 152 of the third prism 150 away from the second prism 140 has a plurality of third prism structures 154. The plurality of third prism structures 154 extend along a third direction T and are arranged parallel to each other. The angle θ2 between the second direction S and the third direction T is greater than or equal to 80 degrees and less than or equal to 90 degrees. Therefore, in this embodiment, the third prism 150 is, for example, a positive prism. Here, the third direction T is the prism axis of the third prism structure 154 (e.g., the ridge line of the third prism structure 154). By designing the angle θ2 between the second direction S and the third direction T to be between 80 degrees and 90 degrees, the second prism 140 and the third prism 150 can guide the light from the first prism 130 to be emitted at a positive angle, which helps to improve the positive light emission brightness of the backlight module 100. It should be noted that the extension direction of the above-mentioned prisms (e.g., the first prism structure 134, the second prism structure 144 and the third prism structure 154) is, for example, the ridge line of the prism. However, the present invention is not limited to this. In other embodiments, the ridge line of the prism may be a reciprocating curve (e.g., a sine curve), and the extension direction may be, for example, the linear trend line of the curve.

[0039] In this embodiment, the angle θ2 between the second direction S and the third direction T can be equal to 90 degrees (i.e., the prism axis of the second prism structure 144 is orthogonal to the prism axis of the third prism structure 154, such as...). Figure 3 (As shown), but not limited thereto. Furthermore, the third prism sheet 150 may include a third substrate 156, and a plurality of third prism structures 154 are disposed on the surface of the third substrate 156 away from the second prism sheet 140. The material of the third substrate 156 may be, for example, polyethylene terephthalate, polymethyl methacrylate, polystyrene, or polycarbonate. The material of the plurality of third prism structures 154 may include UV-curable adhesives or other suitable photocurable polymers, thermosetting polymers, etc. In some other embodiments, the refractive index of the plurality of third prism structures 154 may be between 1.4 and 1.7. In other embodiments, the third substrate 156 and the plurality of third prism structures 154 may be made of the same material; this invention is not particularly limited.

[0040] The working principle of the microstructure diffusion film 120 and the first prism sheet 130 is further explained below. Figure 4 for Figure 1 The simulated luminescence angle distribution of the light emitted by the light-emitting unit after passing through the microstructure diffusion film and the first prism sheet is shown in the figure. Figure 5 This is a simulation diagram of the emission angle distribution of a typical backlight module, where two high-haze diffusion films are placed on the light-emitting unit. Figure 4 and Figure 5 In optical simulation analysis, darker colors represent higher brightness. Figure 4 and Figure 5 Light within the black circle B is directed to the positive viewing angle range after passing through the second prism 140 and the third prism 150. From Figure 4 and Figure 5 It can be seen that, Figure 4 The light intensity near the center of the black circle B is higher than Figure 5 The light intensity near the center of the black circle B. Therefore, it can be known that compared to Figure 5 A typical backlight module, Figure 4 The backlight module 100 allows more light to be directed to the positive viewing angle by the second prism 140 and the third prism 150, thereby improving the efficiency of the backlight module 100.

[0041] Furthermore, in this embodiment, the shapes of the substrate 112, diffusion film substrate 124, first substrate 136, second substrate 146, and third substrate 156 may be rectangular, but are not limited thereto. The shapes of the substrate 112, diffusion film substrate 124, first substrate 136, second substrate 146, and third substrate 156 can be changed according to design requirements. In addition, the microstructure diffusion film 120, first prism sheet 130, second prism sheet 140, and third prism sheet 150 can be separated from each other, but are not limited thereto. For example, at least two of the microstructure diffusion film 120, first prism sheet 130, second prism sheet 140, and third prism sheet 150 can also be bonded together with optical adhesive.

[0042] The following further describes the microstructure 122 of the microstructure diffusion membrane 120. Figure 6 for Figure 1 A three-dimensional schematic diagram of an embodiment of the microstructure of the diffusion membrane. Figure 7 for Figure 6 A top view. See also Figure 1 , Figure 6 and Figure 7 In this embodiment, the microstructure 122 can be a pyramidal structure, i.e., a four-cornered pyramid shape. Specifically, each microstructure 122 may include four side surfaces 122a and a bottom surface 122b. The side surfaces 122a may be triangular, and the bottom surface 122b may be rectangular (i.e., the pyramidal structure may have a rectangular bottom surface). The bottom surface 122b is located, for example, on the first surface 124a of the diffusion film substrate 124. Since the pyramidal microstructure 122 can be used to split the light emitted by the light-emitting unit 114, the backlight module 100 of the microstructure diffusion film 120 using the microstructure 122 can achieve the effect of image uniformity.

[0043] Figure 8 for Figure 1 A three-dimensional schematic diagram of another embodiment of the microstructure of the diffusion membrane. Figure 9 for Figure 8 A top view. See also Figure 8 and Figure 9 The microstructure 122' can be a frustum pyramid structure, i.e., a four-cornered frustum shape. Specifically, each microstructure 122' may include four sides 122'a, a bottom surface 122'b, and a top surface 122'c. The sides 122'a may be trapezoidal, the bottom surface 122'b may be rectangular (i.e., the frustum pyramid structure may have a rectangular bottom surface), and the top surface 122'c may be rectangular. The bottom surface 122'b is, for example, located on the first surface 124a of the diffusion film substrate 124, and the top surface 122'c is, for example, parallel to the bottom surface 122'b or at an angle less than or equal to 10 degrees. The area of ​​the top surface 122'c is, for example, smaller than the area of ​​the bottom surface 122'b. The backlight module 100 using the microstructure diffusion film 120 with microstructure 122' can achieve similar effects to using microstructure 122, which will not be described in detail here.

[0044] Figure 10 for Figure 1 A three-dimensional schematic diagram of an embodiment of the microstructured diffusion film. Please refer to... Figure 1 and Figure 10In the microstructure diffusion film 120 of this embodiment, adjacent microstructures 122 can be connected to each other, and the microstructures 122 are closely arranged. The distribution density of the microstructures 122 is, for example, greater than (e.g., more than twice) the distribution density of the light-emitting units 114. Therefore, it is not necessary to align them with the light-emitting units 114, which can reduce the processing precision of the light-emitting units 114 and the tolerance requirements for the assembly of the backlight module 100, but this is not a limitation. For example, please refer to Figure 11 This is a three-dimensional schematic diagram of an embodiment of the microstructure diffusion film of the backlight module of this utility model. In this embodiment of the microstructure diffusion film 120, multiple adjacent microstructures 122 can be separated from each other (i.e., there can be gaps between each microstructure 122). In one embodiment, the multiple microstructures 122 can be uniformly arranged, such as in an array, but are not limited thereto.

[0045] Figure 12 These are cross-sectional schematic diagrams of various embodiments of the microstructure of the microstructured diffusion membrane of this utility model. Please refer to... Figure 12 The microstructure diffusion membrane 120 may have seven different embodiments of microstructures (i.e., microstructures 122, 122', 123a, 123b, 123c, 123d, and 123e). The top of the microstructures in different embodiments may be planar / sloping, rounded, or pointed. Specifically, the cross-sectional profile of microstructure 122 is triangular, the cross-sectional profile of microstructure 122' is a combination of multiple straight line segments, the cross-sectional profiles of microstructures 123a, 123b, and 123c are a combination of straight line segments and arc segments, and the cross-sectional profiles of microstructures 123d and 123e are a combination of multiple arc segments (i.e., the cross-sectional profile of each microstructure may be a triangle, a combination of multiple straight line segments, a combination of multiple arc segments, or a combination of straight line segments and arc segments). The three-dimensional structure of microstructure 123d may be composed of... Figure 6 The microstructure 122 is formed by changing the side surface 122a of the microstructure 122 to an outwardly convex arc surface, and the three-dimensional structure of the microstructure 123e can be formed by... Figure 6 The side surface 122a of the microstructure 122 is modified into an inwardly concave arc surface. The cross-section of the microstructure refers to a cross-section passing through the top of the microstructure and perpendicular to the light-incident surface (i.e., the first surface 124a) or light-exit surface (i.e., the second surface 124b) of the diffusion film substrate 124. In one embodiment, multiple microstructures are arranged, for example, in an array (e.g.,...). Figure 10 or Figure 11As shown in the figure, the cross-section is more parallel to one of the arrangement directions of the array. In other embodiments, the cross-sectional profile of the microstructure on the microstructure diffusion film 120 can also be adjusted according to the actual light pattern requirements (or beam splitting effect). It should be noted that the shapes of adjacent microstructures on the microstructure diffusion film 120 can be the same or different. In particular, the bottom surface of the microstructure of this invention is not limited to rectangle; in other embodiments, the bottom surface of the microstructure can be, for example, polygonal (e.g., hexagonal) or circular.

[0046] Figure 13 This is a partially enlarged schematic diagram of the first prism sheet of this utility model. Please refer to [link / reference]. Figure 13 Each first prism structure 134 of the first prism sheet 130 has a first apex angle A1, which may be greater than or equal to 80 degrees and less than or equal to 100 degrees. In a preferred embodiment, the first apex angle A1 is 90 degrees.

[0047] Figure 14 This is a partially enlarged schematic diagram of the second prism sheet of this utility model. Figure 15 This is a partially enlarged schematic diagram of the third prism sheet of this utility model. Please refer to... Figure 14 and Figure 15 Each second prism structure 144 of the second prism sheet 140 has a second apex angle A2, which may be greater than or equal to 80 degrees and less than or equal to 100 degrees. Each third prism structure 154 of the third prism sheet 150 has a third apex angle A3, which may be greater than or equal to 80 degrees and less than or equal to 100 degrees. In a preferred embodiment, the second apex angle A2 is 90 degrees and the third apex angle A3 is 90 degrees.

[0048] It should be noted that in the backlight module 100, the refractive index (material) of the first prism sheet 130 and the first apex angle A1 of the first prism structure 134 will affect the light's path through the black circle B (e.g., Figure 4The light intensity near the center (as shown) is affected by the angles θ1 between the prism axis of the first prism structure 134 and the prism axis of the second prism structure 144, θ2 between the prism axis of the second prism structure 144 and the prism axis of the third prism structure 154, and the second apex angle A2 of the second prism structure 144 and the third apex angle A3 of the third prism structure 154, which affect the amount of light guiding the positive angle. In a preferred embodiment, the refractive index of the first prism sheet 130 is between 1.4 and 1.7, and the first apex angle A1 of the first prism structure 134, the second apex angle A2 of the second prism structure 144, and the third apex angle A3 of the third prism structure 154 are all 90 degrees. When the angles θ1 between the prism axis of the first prism structure 134 and the prism axis of the second prism structure 144 and the prism axis of the second prism structure 144 and the prism axis of the third prism structure 154 are also 90 degrees, the backlight module 100 has better efficiency and has the effect of brightness gain.

[0049] Figure 16 This is a schematic diagram of an embodiment of the display device of this utility model. Please refer to... Figure 16 The display device 200 includes a backlight module 100 and a display panel 210, with the display panel 210 disposed on the backlight module 100 (i.e., the display panel 210 is disposed on the side of the third prism sheet 150 away from the second prism sheet 140). In this embodiment, the display panel 210 is, for example, a liquid crystal display panel, and the backlight module 100 provides light to the display panel 210. However, this invention does not impose many limitations on the type of display panel 210. Compared to the prior art, the display device 200 of this embodiment uses a backlight module 100, which can improve hot spot phenomena and also enhance the brightness at the normal viewing angle.

[0050] Figure 17 This is a schematic diagram of another embodiment of the backlight module of this utility model. Please refer to [link / reference]. Figure 17 In addition to the light source assembly 110, microstructure diffusion film 120, first prism sheet 130, second prism sheet 140, and third prism sheet 150, the backlight module 300 may also include a blue light transmission (BLT) film 360 and a color conversion film 370. The blue light transmission film 360 is disposed between the light source assembly 110 and the microstructure diffusion film 120, and the color conversion film 370 is disposed between the blue light transmission film 360 and the microstructure diffusion film 120. Furthermore, in this embodiment, all the multiple light-emitting units 114 of the light source assembly 110 are blue light-emitting units.

[0051] The blue light transmission film 360 is used to achieve high transmittance (e.g., 80% or more) of blue light emitted by the multiple light-emitting units 114 of the light source assembly 110, while simultaneously achieving high reflectance (e.g., 80% or more) of red and green light. This reduces the loss of red and green light, thereby improving the luminance of the backlight module 300. The color conversion film 370 can be a quantum dot (QD) film or a fluorescent film. The color conversion film 370 is used to convert at least a portion of the blue light emitted by the multiple light-emitting units 114 of the light source assembly 110 into red and green light, and at least another portion of the blue light passes through the color conversion film 370. Specifically, when the blue light emitted by the multiple light-emitting units 114 of the light source assembly 110 passes through the color conversion film 370, it possesses the three primary colors of blue, red, and green light, significantly improving color gamut performance and making colors more vivid, thus achieving superior display performance.

[0052] Please refer to Table 1, which is... Figure 17 The backlight module 300 and the use of two high-haze diffusion films to replace Figure 17 A comparison table of simulation results between the microstructure diffusion film 120 and the backlight module (i.e., the general backlight module) behind the first prism sheet 130.

[0053] Table 1

[0054] Brightness (unit: nits) 42684 47659 Ratio 1 1.12

[0055] As shown in Table 1, the backlight module 300 utilizes a microstructure diffusion film 120 and a first prism sheet 130 to replace the two high-haze diffusion films of a typical backlight module for two-dimensional light diffusion and guidance, thereby achieving higher brightness (i.e., a luminance gain effect). In other words, when the prism axis of the first prism sheet 130 is orthogonal to the prism axis of the second prism sheet 140, the first prism sheet 130 can also deflect light within a specific angle range, allowing light within this angle range to be guided by the second prism sheet 140 and the third prism sheet 150 to the normal direction of the viewing angle, thereby improving the efficiency of the backlight module 300.

[0056] Figure 18 This is a schematic diagram of another embodiment of the display device of this utility model. Please refer to... Figure 18The display device 400 includes a backlight module 300 and a display panel 410, with the display panel 410 disposed on the backlight module 300 (i.e., the display panel 310 is disposed on the side of the third prism sheet 150 away from the second prism sheet 140). In this embodiment, the display panel 410 is, for example, a liquid crystal display panel, and the backlight module 300 provides light to the display panel 410. However, this invention does not impose many limitations on the type of display panel 410. Compared to the prior art, the display device 400 of this embodiment uses a backlight module 300, which can improve hot spot phenomena and also enhance the brightness at the viewing angle.

[0057] In summary, the backlight module and display device of the present invention have at least one of the following advantages: through the two-dimensional diffusion and light diffusion angle control of the microstructure diffusion film, the one-dimensional diffusion of the first prism sheet, and the light guiding design of the second and third prism sheets, hot spot phenomena are improved while also increasing the efficiency of the backlight module (i.e., increasing the brightness at the viewing angle). Furthermore, the use of blue light-emitting units and the arrangement of a blue light-transmitting film and a color conversion film enhances the brightness of the backlight module and improves color gamut performance, thereby achieving superior display performance.

[0058] The above description is merely a preferred embodiment of this utility model and should not be construed as limiting the scope of this utility model. Any simple equivalent changes and modifications made in accordance with the claims and description of this utility model are still within the scope of this utility model patent. Furthermore, no embodiment or claim of this utility model needs to achieve all the purposes, advantages, or features disclosed in this utility model. In addition, the abstract and headings are only used to assist in patent document retrieval and are not intended to limit the scope of this utility model. Furthermore, the terms "first," "second," etc., mentioned in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

Claims

1. A backlight module, characterized in that, include: A light source assembly includes at least one substrate and a plurality of light-emitting units, wherein the plurality of light-emitting units are arranged in an array on the at least one substrate; A microstructure diffusion film is disposed on one side of the light source assembly and has multiple microstructures and a diffusion film substrate. The diffusion film substrate includes a first surface and a second surface that are opposite to each other, and the multiple microstructures are disposed on at least one of the first surface and the second surface. A first prism sheet is disposed on one side of the second surface of the microstructure diffusion film. The surface of the first prism sheet facing the second surface of the microstructure diffusion film has a plurality of first prism structures, and the plurality of first prism structures extend along a first direction. The second prism sheet is disposed on the side of the first prism sheet away from the microstructure diffusion film. The surface of the second prism sheet away from the first prism sheet has a plurality of second prism structures. The plurality of second prism structures extend along a second direction. The angle between the first direction and the second direction is greater than or equal to 65 degrees and less than or equal to 90 degrees. as well as A third prism is disposed on the side of the second prism away from the first prism. The surface of the third prism away from the second prism has a plurality of third prism structures. The plurality of third prism structures extend along a third direction. The angle between the second direction and the third direction is greater than or equal to 80 degrees and less than or equal to 90 degrees.

2. The backlight module according to claim 1, characterized in that, All of the multiple light-emitting units are blue light-emitting units, and the backlight module further includes: A blue light-transmitting film is disposed between the light source component and the microstructure diffusion film; and A color conversion film is disposed between the blue light transmitting film and the microstructure diffusion film.

3. The backlight module according to claim 1, characterized in that, Each of the plurality of microstructures is a pyramidal structure or a frustum pyramidal structure.

4. The backlight module according to claim 3, characterized in that, The pyramidal structure or the frustum-shaped pyramidal structure has a rectangular base.

5. The backlight module according to claim 1, characterized in that, The adjacent microstructures are connected to each other.

6. The backlight module according to claim 1, characterized in that, The adjacent microstructures are separated from each other.

7. The backlight module according to claim 1, characterized in that, The cross-sectional profile of each of the multiple microstructures is a triangle, a combination of multiple straight line segments, a combination of multiple arc segments, or a combination of straight line segments and arc segments.

8. The backlight module according to claim 1, characterized in that, Each of the plurality of first prism structures has a first apex angle, which is greater than or equal to 80 degrees and less than or equal to 100 degrees.

9. The backlight module according to claim 1, characterized in that, Each of the plurality of second prism structures has a second apex angle, which is greater than or equal to 80 degrees and less than or equal to 100 degrees, and each of the plurality of third prism structures has a third apex angle, which is greater than or equal to 80 degrees and less than or equal to 100 degrees.

10. A display device, characterized in that, include: The backlight module as described in claim 1; as well as The display panel is mounted on the backlight module.

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