Backlight module and display module

Abstract

This application relates to a backlight module and a display module. The backlight module includes: a frame, including a base plate and a side frame disposed on one side of the base plate, the base plate and the side frame forming a cavity; a reflective sheet disposed on one side of the base plate and within the cavity; a light guide plate disposed on the side of the reflective sheet away from the base plate, the side end face of the light guide plate including a first light guide end face, and the inner surface of the side frame located in the cavity including a first frame face opposite to the first light guide end face; a plurality of light sources, at least disposed between the first light guide end face and the first frame face; and a light modulation structure film located on the side of the light guide plate away from the reflective sheet; wherein the light modulation structure film includes at least one of at least a reverse prism film and at least one periodically stacked anti-reflective film, the periodically stacked anti-reflective film including multiple layers of birefringent true zero-order waveplates and multiple layers of non-birefringent material, the birefringent true zero-order waveplates and non-birefringent material layers being alternately disposed. This application can improve the brightness of collimated light.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a backlight module and a display module. Background Technology

[0002] Liquid Crystal Displays (LCDs) offer advantages such as light weight, thinness, low power consumption, ease of driving, and absence of harmful radiation. LCDs are widely used in modern information devices such as televisions, laptops, mobile phones, and personal digital assistants, and have broad development prospects. An LCD includes a backlight module that provides the light source. In the backlight module, multiple LEDs are positioned on one side of a light guide plate. The light emitted by the LEDs passes through multiple optical films, including the light guide plate, and is then emitted to provide the light source for the display panel. When LCDs are used in near-eye displays such as Virtual Reality (VR), to enhance light perception contrast, improve virtual immersion, and prevent dizziness, ideally, high-brightness collimated emitted light should be used as the display light source.

[0003] However, existing technologies suffer from insufficient brightness of the collimated light emitted from the backlight module. Summary of the Invention

[0004] Therefore, it is necessary to provide a backlight module and a display module to address the problem of insufficient brightness of collimated light emitted by the backlight module in the existing technology.

[0005] According to a first aspect of this application, a backlight module is provided, comprising:

[0006] The frame includes a base plate and a side frame disposed on one side of the base plate, the base plate and the side frame forming an accommodating cavity;

[0007] A reflective sheet is disposed on one side of the base plate and within the receiving cavity;

[0008] A light guide plate is disposed on the side of the reflector away from the base plate. The side end face of the light guide plate includes a first light guide end face. The side frame located on the inner surface of the accommodating cavity includes a first frame surface disposed opposite to the first light guide end face.

[0009] Multiple light sources are disposed at least between the first light guide end face and the first frame face;

[0010] A light modulation structure film is located on the side of the light guide plate away from the reflective sheet;

[0011] The light modulation structure film includes at least one of an inverse prism film and at least one periodic stacked anti-reflection film. The periodic stacked anti-reflection film includes multiple layers of birefringent true zero-order waveplates and multiple layers of non-birefringent materials, with the birefringent true zero-order waveplates and non-birefringent materials alternating.

[0012] In some embodiments, the light modulation structure film includes at least one of the reverse prism films;

[0013] The reverse prism film includes a first prism film body and a plurality of first prisms located on the side of the first prism film body close to the light guide plate and protruding toward the light guide plate;

[0014] The light guide plate is a V-cut type light guide plate.

[0015] In some embodiments, the light modulation structure film further includes a prism sheet located between the light guide plate and the reverse prism film;

[0016] The prism sheet includes a second prism film body and a plurality of second prisms located on the side of the second prism film body away from the light guide plate and protruding away from the light guide plate.

[0017] In some embodiments, the first prism includes a first prism surface near the first light-guiding end face and a second prism surface away from the first light-guiding end face, with the first prism surface and the second prism surface sandwiching the first prism; the angle between the first prism surface and the first normal is 6.6 degrees to 8.6 degrees, the angle between the second prism surface and the first normal is 27.8 degrees to 29.8 degrees, and the first normal is perpendicular to the plane containing the first prism film body; and / or,

[0018] The second prism includes a third prism surface near the first light-guiding end face and a fourth prism surface away from the first light-guiding end face, wherein the second prism is sandwiched between the third prism surface and the fourth prism surface; the angle between the third prism surface and the plane containing the second prism film body is 52 degrees to 54 degrees, and the angle between the fourth prism surface and the plane containing the second prism film body is 36 degrees to 38 degrees; and / or,

[0019] The light guide plate includes a first light guide surface near the reflector sheet. The light guide plate includes a plurality of cuts on the first light guide surface. The cuts are V-shaped. Each cut includes a first cut surface near the first light guide end face and a second cut surface away from the first light guide end face. The angle between the first cut surface and the plane containing the first light guide surface is 1 degree to 3 degrees, and the angle between the second cut surface and the plane containing the first light guide surface is 87 degrees to 89 degrees.

[0020] In some embodiments, the light modulation structure film includes at least one periodically stacked antireflective film;

[0021] The periodically stacked antireflective coating transmits ordinary light and reflects extraordinary light.

[0022] In some embodiments, the ordinary refractive index of the birefringent true zero-order waveplate layer is n. o The unusual optical refractive index of the birefringent true zero-order waveplate layer is n. e The refractive index of the non-birefringent material layer is the first refractive index n1;

[0023] Where, n e <n o = n1.

[0024] In some embodiments, the wavelength of the unusual light reflected by the periodically stacked antireflective coating includes 380 nm to 780 nm; and / or,

[0025] At least some of the birefringent true zero-order waveplate layers have different thicknesses; and / or,

[0026] At least some of the non-birefringent material layers have the same thickness.

[0027] In some embodiments, the light modulation structure film includes at least one of the reverse prism films and at least one periodically stacked anti-reflection film.

[0028] The reverse prism film is located on the side of the periodically stacked antireflective film away from the reflective sheet;

[0029] The periodically stacked antireflective coating transmits ordinary light and reflects extraordinary light.

[0030] In some embodiments, the light guide plate is a V-cut type light guide plate;

[0031] The ordinary refractive index of the birefringent true zero-order waveplate layer is n. o The unusual optical refractive index of the birefringent true zero-order waveplate layer is n. e The refractive index of the non-birefringent material layer is a first refractive index n1; where n e <n o = n1.

[0032] According to a second aspect of this application, a display module is provided, including the backlight module described in any one of the above-mentioned methods, the display module further including a display panel located on the side of the light modulation structure film away from the reflective sheet.

[0033] In this embodiment, the light modulation structure film is located on the side of the light guide plate away from the reflector. The light modulation structure film includes at least one of a reverse prism film and at least one periodically stacked anti-reflective film. The periodically stacked anti-reflective film includes multiple layers of birefringent true zero-order waveplates and multiple layers of non-birefringent materials, with the birefringent true zero-order waveplates and non-birefringent materials alternating between the two. Firstly, the reverse prism film can convert / converge obliquely oriented light rays emitted at a wide angle into narrow-angle / normal-oriented light rays, reducing the amount of obliquely oriented light emitted and increasing the amount of narrow-angle / normal-oriented light emitted, thereby improving the collimated light brightness of the backlight module. Secondly, the periodically stacked anti-reflective film includes multiple layers of birefringent true zero-order waveplates and multiple layers of non-birefringent materials, with the birefringent true zero-order waveplates and non-birefringent materials alternating between the two. The birefringent true zero-order waveplate separates light into ordinary and extraordinary light. One type of ordinary and extraordinary light (e.g., ordinary light) can pass through the birefringent true zero-order waveplate, while the other type (e.g., extraordinary light) can be reflected by the birefringent true zero-order waveplate. The reflected light (e.g., extraordinary light) is reflected again by the reflector and becomes a mixture of ordinary and extraordinary light, which then re-enters the periodically stacked anti-reflective coating. This repeated transmission and reflection allows more light emitted from the light source to enter the display panel. Combined with the lower polarizer of the display panel and the periodically stacked anti-reflective coating, which transmits the same type of light (e.g., ordinary light), the light output and brightness of the backlight module can be greatly improved, thus enhancing the collimated light brightness of the backlight module. Thirdly, the combination of the reverse prism film and the periodically stacked anti-reflective coating not only allows more light emitted from the light source to enter the display panel but also reduces the output of oblique-view light and increases the output of narrow-viewing / direct-view light, further improving the collimated light brightness of the backlight module. The embodiments of this application have at least one of the effects described above. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of this application, the drawings used in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a first type of backlight module provided in an embodiment of this application.

[0036] Figure 2 This is yet another schematic diagram of a first type of backlight module provided in an embodiment of this application.

[0037] Figure 3This is an enlarged schematic diagram of a light modulation structure film in a backlight module provided in an embodiment of this application.

[0038] Figure 4 This is a schematic diagram of a second type of backlight module provided in an embodiment of this application.

[0039] Figure 5 This is yet another schematic diagram of a second type of backlight module provided in an embodiment of this application.

[0040] Figure 6 This is a schematic diagram of a third type of backlight module provided in an embodiment of this application.

[0041] Reference numerals: Display module 300; Display panel 200; Backlight module 100; Frame 10; Reflective sheet 20; Light guide plate 30; Light source 40; Side frame 11; Base plate 12; Receiving cavity 10q; First light guide end face 311; First frame surface 111; Reverse prism film 60; Periodically stacked anti-reflection film 70; Birefringent true zero-order waveplate layer 71; Non-birefringent material layer 72; First ordinary ray g11; First extraordinary ray g12; Second ordinary ray g21; Second extraordinary ray g22; Frontal ray 101; Oblique ray 102; Upper polarizer 81; Liquid crystal cell; 82; Lower polarizer; 83; First prism film body 601; First prism 60t; First prism surface 60t1; Second prism surface 60t2; First included angle α1; Second included angle α2; First light guide surface 301a; Cut 30t; First cut surface 30t1; Second cut surface 30t2; Fifth included angle α5; Sixth included angle α6; Prism sheet 50; Second prism film body 501; Second prism 50t; Third prism surface 50t1; Fourth prism surface 50t2; Third included angle α3; Fourth included angle α4. Detailed Implementation

[0042] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0043] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0048] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0049] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the implementation methods provided in the embodiments of this application can be combined with each other without contradiction.

[0050] Existing technologies suffer from insufficient brightness of collimated light emitted from backlight modules.

[0051] To address the aforementioned issues, this application provides a backlight module and a display module.

[0052] Please see Figures 1 to 6 . Figure 1 This is a schematic diagram of a first type of backlight module provided in an embodiment of this application. Figure 2 This is yet another schematic diagram of a first type of backlight module provided in an embodiment of this application. Figure 3 This is an enlarged schematic diagram of a light modulation structure film in a backlight module provided in an embodiment of this application. Figure 4 This is a schematic diagram of a second type of backlight module provided in an embodiment of this application. Figure 5 This is yet another schematic diagram of a second type of backlight module provided in an embodiment of this application. Figure 6 This is a schematic diagram of a third type of backlight module provided in an embodiment of this application.

[0053] It should be noted that, in order to more clearly explain the spirit of the invention, Figure 1 and Figure 2 The same, or with different numbering or emphasis on different characteristics, Figure 4 and Figure 5 They are the same, or they have been numbered differently or have different features emphasized. Figure 6 It also illustrates a display module 300.

[0054] Firstly, please refer to Figures 1 to 6 This application provides a backlight module 100, which includes a frame 10, a reflective sheet 20, a light guide plate 30, multiple light sources 40, and a light modulation structure film. The frame 10 includes a base plate 12 and a side frame 11 disposed on one side of the base plate 12, the base plate 12 and the side frame 11 forming a cavity 10q; the reflective sheet 20 is disposed on one side of the base plate 12 and within the cavity 10q; the light guide plate 30 is disposed on the side of the reflective sheet 20 away from the base plate 12, the side end face of the light guide plate 30 includes a first light guide end face 311, and the inner surface of the side frame 11 located in the cavity 10q includes a first frame surface 111 opposite to the first light guide end face 311; multiple light sources 40... The light source 40 is at least disposed between the first light guide end face 311 and the first frame face 111; the light modulation structure film is located on the side of the light guide plate 30 away from the reflector 20; wherein, the light modulation structure film includes at least one of at least one reverse prism film 60 and at least one periodic stacked anti-reflection film 70, the periodic stacked anti-reflection film 70 includes multiple layers of birefringent true zero-order waveplate layer 71 and multiple layers of non-birefringent material layer 72, the birefringent true zero-order waveplate layer 71 and the non-birefringent material layer 72 are alternately disposed.

[0055] For example, the light source 40 can be an LED lamp, but is not limited to this. The incident light emitted by the light source 40 enters the light guide plate 30 through the first light guide end face 311, and then exits from the side of the light modulation structure film away from the reflector 20.

[0056] For example, the light modulation structure film includes at least one of at least an inverse prism film 60 and at least one periodically stacked anti-reflective film 70. Figures 1 to 3 As shown, the light modulation structure film includes at least one inverse prism film 60. (As...) Figure 4 and Figure 5 As shown, the light modulation structure film includes at least one periodically stacked antireflective film 70. (As...) Figure 6 As shown, the light modulation structure film includes at least one reverse prism film 60 and at least one periodically stacked anti-reflection film 70.

[0057] For example, such as Figure 2 As shown, the reverse prism film 60 can transform / converge the oblique light rays 102 emitted from the oblique angle and wide angle into narrow angle / normal light rays 101, reduce the amount of light emitted from the oblique light rays 102, increase the amount of light emitted from the narrow angle / normal light rays 101, and improve the collimated light brightness of the backlight module 100.

[0058] For example, the birefringent true zero-order waveplate layer 71 is one type of birefringent material layer. The material of the birefringent true zero-order waveplate layer can be an anisotropic crystal, having different refractive indices for light with different polarization directions. The birefringent true zero-order waveplate layer can have an ultrathin thickness on the micrometer scale, but is not limited to this. The material of the birefringent true zero-order waveplate layer includes at least one of quartz, mica, and MgF2, but is not limited to this.

[0059] For example, non-birefringent material layers utilize isotropic materials to achieve precise zero-order phase delay, but are not limited to this.

[0060] For example, such as Figure 5 As shown, the periodic stacked antireflective coating 70 includes multiple layers of birefringent true zero-order waveplates 71 and multiple layers of non-birefringent material 72; in a direction perpendicular to the plane of the reflector 20, the birefringent true zero-order waveplates 71 and the non-birefringent material layers 72 are alternately arranged. The birefringent true zero-order waveplate layer 71 separates light into ordinary light and extraordinary light. One of the ordinary light and extraordinary light (e.g., ordinary light) can pass through the birefringent true zero-order waveplate layer 71, while the other (e.g., extraordinary light) can be reflected by the birefringent true zero-order waveplate layer 71. The reflected light (e.g., extraordinary light) is reflected again by the reflector 20 and becomes a mixed light of ordinary light and extraordinary light, which is then incident on the periodically stacked anti-reflective film 70 again. This repeated transmission and reflection allows more light emitted from the light source 40 to be incident on the display panel 200. When the lower polarizer 83 of the display panel 200 and the periodically stacked anti-reflective film 70 transmit the same type of light (e.g., ordinary light), the light output and brightness of the backlight module 100 can be greatly improved, thus enhancing the collimated light brightness of the backlight module 100.

[0061] In this embodiment, the light modulation structure film is located on the side of the light guide plate 30 away from the reflector 20. The light modulation structure film includes at least one of a reverse prism film 60 and at least one periodically stacked anti-reflective film 70. The periodically stacked anti-reflective film 70 includes multiple layers of birefringent true zero-order waveplates 71 and multiple layers of non-birefringent material layers 72, with the birefringent true zero-order waveplates 71 and non-birefringent material layers 72 alternately arranged. Firstly, the reverse prism film 60 can transform / converge obliquely angled light rays 102 emitted at a wide angle into narrow-angle / normal-angle light rays 101, reducing the amount of light emitted from the obliquely angled light rays 102 and increasing the amount of light emitted from the narrow-angle / normal-angle light rays 101, thereby improving the collimated light brightness of the backlight module 100. Secondly, the periodically stacked anti-reflective film 70 includes multiple layers of birefringent true zero-order waveplates 71 and multiple layers of non-birefringent material layers 72, with the birefringent true zero-order waveplates 71 and non-birefringent material layers 72 alternately arranged. The birefringent true zero-order waveplate layer 71 separates light into ordinary light and extraordinary light. One of the ordinary light and extraordinary light (e.g., ordinary light) can pass through the birefringent true zero-order waveplate layer 71, while the other (e.g., extraordinary light) can be reflected by the birefringent true zero-order waveplate layer 71. The reflected light (e.g., extraordinary light) is reflected again by the reflector 20 and becomes a mixed light of ordinary light and extraordinary light, which is then incident on the periodically stacked anti-reflective film 70 again. This repeated transmission and reflection allows more light emitted from the light source 40 to be incident on the display panel 200. When the lower polarizer 83 of the display panel 200 and the periodically stacked anti-reflective film 70 transmit the same type of light (e.g., ordinary light), the light output and brightness of the backlight module 100 can be greatly improved, thus enhancing the collimated light brightness of the backlight module 100. Thirdly, the combination of the reverse prism film 60 and the periodically stacked anti-reflective film 70 not only allows more light emitted from the light source 40 to be incident on the display panel 200, but also reduces the amount of light emitted from the oblique-viewing light 102 and increases the amount of light emitted from the narrow-viewing / direct-viewing light 101, thereby better improving the collimated light brightness of the backlight module 100. The embodiments of this application have at least one of the above-mentioned effects.

[0062] In some embodiments, the light modulation structure film includes at least one reverse prism film 60; the reverse prism film 60 includes a first prism film body 601 and a plurality of first prisms 60t located on the side of the first prism film body 601 near the light guide plate 30 and protruding toward the light guide plate 30; the light guide plate 30 is a V-cut type light guide plate.

[0063] For example, such as Figures 1 to 3As shown, the light guide plate 30 is a V-cut type light guide plate, meaning that the light guide plate 30 includes a first light guide surface 301a near the reflector 20, and the light guide plate 30 includes a plurality of cuts 30t located on the first light guide surface 301a, the cuts 30t being V-shaped. For example, the cuts 30t include a first cut surface 30t1 near the first light guide end face 311, and a second cut surface 30t2 away from the first light guide end face 311.

[0064] For example, the first prism 60t includes a first prism surface 60t1 on the side close to the first light guide end face 311 and a second prism surface 60t2 on the side away from the first light guide end face 311, with the first prism surface 60t1 and the second prism surface 60t2 sandwiching the first prism 60t.

[0065] For example, the light guide plate 30 is a V-cut type light guide plate. The light guide plate 30 improves the light utilization rate and the light output of the narrow angle / front view light 101 by means of, but not limited to: light transmitted in the light guide plate 30 in a near-horizontal direction, or light reflected by the second light guide surface of the light guide plate away from the reflector 20, being reflected or totally reflected by the first cut surface 30t1 into the light of the narrow angle / front view light 101, thereby reducing the light output of the oblique view light 102, increasing the light output of the narrow angle / front view light 101, and improving the collimated light brightness of the backlight module 100.

[0066] For example, the reverse prism film 60 improves light utilization and increases the amount of light emitted from the narrow-angle / normal-view ray 101 by means of, but not limited to: oblique rays incident from the first prism surface 60t1 are reflected or totally reflected into narrow-angle / normal-view ray 101 from the second prism surface 60t2, thereby reducing the amount of light emitted from the oblique rays 102, increasing the amount of light emitted from the narrow-angle / normal-view ray 101, and improving the collimated light brightness of the backlight module 100.

[0067] For example, the V-cut light guide plate 30 is combined with the reverse prism film 60. The light guide plate 30 converts the light into a narrower angle light, and the reverse prism film 60 further converts the narrower angle light into a positive angle / collimated light for emission. Through step-by-step / multiple conversions, the amount of positive angle / collimated light emitted can be greatly improved, and the brightness of the collimated light can be greatly enhanced.

[0068] In some embodiments, the light modulation structure film further includes a prism sheet 50 located between the light guide plate 30 and the reverse prism film 60; the prism sheet 50 includes a second prism film body 501 and a plurality of second prisms 50t located on the side of the second prism film body 501 away from the light guide plate 30 and protruding away from the light guide plate 30.

[0069] For example, such as Figures 1 to 3As shown, the light modulation structure film also includes a prism sheet 50, which is disposed opposite to the reverse prism film 60.

[0070] In some implementations, such as Figure 1 As shown, the plurality of first prisms 60t of the reverse prism film 60 can be offset relative to the plurality of second prisms 50t of the prism sheet 50.

[0071] In other implementations, such as Figure 2 As shown, the plurality of first prisms 60t of the reverse prism film 60 can be arranged opposite to the plurality of second prisms 50t of the prism sheet 50.

[0072] In some implementations, such as Figures 1 to 3 As shown, the first prism 60t includes a first prism surface 60t1 near the first light-guiding end face 311 and a second prism surface 60t2 away from the first light-guiding end face 311. The first prism 60t is sandwiched between the first prism surface 60t1 and the second prism surface 60t2. The angle between the first prism surface 60t1 and the first normal is 6.6 degrees to 8.6 degrees, and the angle between the second prism surface 60t2 and the first normal is 27.8 degrees to 29.8 degrees. The first normal is perpendicular to the plane where the first prism film body 601 is located. And / or, the second prism 50t includes a third prism surface 50t1 near the first light-guiding end face 311 and a fourth prism surface 50t2 away from the first light-guiding end face 311. The second prism 50t is sandwiched between the third prism surface 50t1 and the fourth prism surface 50t2. The angle between the mirror surface 50t1 and the plane containing the second prism 50t film body 501 is 52 degrees to 54 degrees, and the angle between the fourth prism surface 50t2 and the plane containing the second prism 50t film body 501 is 36 degrees to 38 degrees; and / or, the light guide plate 30 includes a first light guide surface 301a near the reflector 20, and the light guide plate 30 includes a plurality of cuts 30t located on the first light guide surface 301a. The cuts 30t are V-shaped, and the cuts 30t include a first cut surface 30t1 near the first light guide end face 311 and a second cut surface 30t2 away from the first light guide end face 311; the angle between the first cut surface 30t1 and the plane containing the first light guide surface 301a is 1 degree to 3 degrees, and the angle between the second cut surface 30t2 and the plane containing the first light guide surface 301a is 87 degrees to 89 degrees.

[0073] For example, please refer to Figure 3 The angle between the surface 60t1 of the first prism and the first normal is the first included angle α1, which is 6.6 degrees to 8.6 degrees. For example, the first included angle α1 can be any value among 6.6 degrees, 7.6 degrees and 8.6 degrees.

[0074] For example, please refer to Figure 3The angle between the second prism surface 60t2 and the first normal is the second included angle α2, which is 27.8 degrees to 29.8 degrees. For example, the second included angle α2 can be any value among 27.8 degrees, 28.8 degrees, and 29.8 degrees.

[0075] For example, please refer to Figure 3 The angle between the surface 50t1 of the third prism and the plane containing the membrane body 501 of the second prism 50t is the third included angle α3, which is 52 degrees to 54 degrees. For example, the third included angle α3 can be any value among 52 degrees, 53 degrees and 54 degrees.

[0076] For example, please refer to Figure 3 The angle between the surface of the fourth prism 50t2 and the plane containing the membrane body 501 of the second prism 50t is the fourth included angle α4, which is 36 degrees to 38 degrees. For example, the fourth included angle α4 can be any value among 36 degrees, 37 degrees and 38 degrees.

[0077] For example, please refer to Figure 3 The angle between the first cut surface 30t1 and the plane containing the first light guide surface 301a is the fifth angle α5, which is 1 degree to 3 degrees. For example, the fifth angle α5 can be any value among 1 degree, 2 degrees and 3 degrees.

[0078] For example, please refer to Figure 3 The angle between the second cut surface 30t2 and the plane containing the first light guide surface 301a is the sixth included angle α6, which is 87 degrees to 89 degrees. For example, the sixth included angle α6 can be any value among 87 degrees, 88 degrees, and 89 degrees.

[0079] For example, the backlight module 100 may improve the brightness of collimated light in ways including but not limited to: light transmitted in the light guide plate 30 in a near-horizontal direction, or light reflected by the second light guide surface in the light guide plate away from the reflector 20, being reflected or totally reflected by the first notch surface 30t1 into light with a narrower viewing angle, the narrower viewing angle light being refracted / totally reflected by the third prism surface 50t1 and the fourth prism surface 50t2, and incident from an appropriate angle onto the first prism surface 60t1 and the second prism surface 60t2, the narrower viewing angle light being reflected or totally reflected by the second prism surface 60t2 into light with a narrow viewing angle / direct viewing ray 101, thereby reducing the amount of light emitted by the oblique viewing ray 102, increasing the amount of light emitted by the narrow viewing angle / direct viewing ray 101, and improving the brightness of the collimated light of the backlight module 100. By setting appropriate and matching angles among the above-mentioned slits 30t, second prism 50t, and first prism 60t, the amount of collimated light emitted from the positive angle / collimated light source can be improved better, step by step, and in a better way, thus greatly improving the brightness of the collimated light.

[0080] For example, such as Figure 2As shown, simulation verification shows that the full width at half maximum (FWHM) of the emitted light from the backlight module 100 is less than 5 degrees at 0 degrees azimuth angle (horizontal direction) and less than 5 degrees at 90 degrees azimuth angle (horizontal direction), with a brightness gain of approximately 330%.

[0081] In some implementations, such as Figures 4 to 5 As shown, the light modulation structure film includes at least one periodically stacked anti-reflective film 70; the periodically stacked anti-reflective film 70 transmits ordinary light and reflects extraordinary light.

[0082] For example, such as Figure 5 As shown, the birefringent true zero-order waveplate layer 71 and the non-birefringent material layer 72 are alternately arranged. The birefringent true zero-order waveplate layer 71 separates light into ordinary light and extraordinary light. The first ordinary light g11 can pass through the birefringent true zero-order waveplate layer 71, and the first extraordinary light g12 can be reflected by the birefringent true zero-order waveplate layer 71. The reflected first extraordinary light g12 is reflected again by the reflector 20 and becomes a mixture of the second ordinary light g21 and the second extraordinary light g22, which is then incident on the periodically stacked anti-reflection film 70. The second ordinary light g21 can pass through the birefringent true zero-order waveplate layer 71, and the second extraordinary light g22 can be reflected by the birefringent true zero-order waveplate layer 71. This repeated transmission and reflection allows more light emitted from the light source 40 to be incident on the display panel 200. When the lower polarizer 83 of the display panel 200 and the periodically stacked anti-reflection film 70 transmit the same type of light (such as ordinary light), the light output and brightness of the backlight module 100 can be greatly improved, thus improving the collimated light brightness of the backlight module 100.

[0083] For example, such as Figure 5 As shown, the lower polarizer 83 of the display panel 200 transmits ordinary light.

[0084] For example, the material of the birefringent true zero-order waveplate layer 71 includes quartz or mica. The material of the non-birefringent material layer 72 includes titanium dioxide, aluminum oxide, glass, etc.

[0085] It should be noted that the periodically stacked antireflective film 70 can be directly formed on the surface of the light guide plate 30. For example, alternating birefringent true zero-order waveplate layers 71 and non-birefringent material layers 72 can be formed directly on the surface of the light guide plate 30 away from the reflector 20 by vapor deposition, which can reduce the thickness of the backlight module 100.

[0086] In some implementations, such as Figures 4 to 5 As shown, the ordinary refractive index of the birefringent true zero-order waveplate layer 71 is n. o The unusual refractive index of the birefringent true zero-order waveplate layer 71 is n eThe refractive index of the non-birefringent material layer 72 is the first refractive index n1; where n e <n o = n1.

[0087] For example, n o = n1 can increase the transmittance of ordinary light through the birefringent true zero-order waveplate layer 71 and reduce the total internal reflection / reflection of ordinary light.

[0088] In some implementations, such as Figures 4 to 5 As shown, the wavelengths of unusual light reflected by the periodically stacked antireflective coating 70 include 380 nm to 780 nm; and / or, at least some of the birefringent true zero-order waveplate layers 71 have different thicknesses; and / or, at least some of the non-birefringent material layers 72 have the same thickness.

[0089] For example, the periodically stacked antireflective coating 70 may include hundreds or even more sub-film layers, and at least a portion of the different birefringent true zero-order waveplate layers 71 may have different thicknesses, such that birefringent true zero-order waveplate layers 71 of different thicknesses can reflect light of different wavelengths.

[0090] For example, different non-birefringent material layers 72 have the same thickness, which can reduce manufacturing difficulty.

[0091] For example, such as Figure 5 As shown in the simulation, the brightness gain of the emitted light from the backlight module 100 is greater than 60%.

[0092] In some implementations, such as Figure 6 As shown, the light modulation structure film includes at least one reverse prism film 60 and at least one periodic stacked anti-reflective film 70. The reverse prism film 60 is located on the side of the periodic stacked anti-reflective film 70 away from the reflector 20. The periodic stacked anti-reflective film 70 transmits ordinary light and reflects extraordinary light.

[0093] For example, such as Figure 6 As shown, the V-cut light guide plate 30, prism sheet 50, reverse prism film 60, and periodically stacked anti-reflective film 70, combined / work together, can better improve the light output efficiency and the proportion of collimated light, thereby better improving the brightness of the collimated light. For example, as... Figure 6 As shown in the simulation, the brightness gain of the emitted light from the backlight module 100 is greater than 390%.

[0094] In some implementations, such as Figure 6 As shown, the light guide plate 30 is a V-cut type light guide plate 30; the ordinary refractive index of the birefringent true zero-order waveplate layer 71 is n. o The unusual refractive index of the birefringent true zero-order waveplate layer 71 is ne The refractive index of the non-birefringent material layer 72 is the first refractive index n1; where n e <n o = n1.

[0095] Secondly, combining Figure 6 As shown, this application also provides a display module 300, which includes the backlight module 100 of any of the above. The display module also includes a display panel 200, which is located on the side of the light modulation structure film away from the reflective sheet 20.

[0096] For example, such as Figure 6 As shown, the display module 300 includes a backlight module 100 and a display panel 200 disposed on the light-emitting side of the backlight module 100 (the display panel 200 is disposed on the side of the light modulation structure film away from the base plate 12). The backlight module 100 provides a light source for the display panel 200 to display.

[0097] For example, when the display panel 200 is a liquid crystal display panel (LCD), the display panel 200 may include a color filter substrate and an array substrate, as well as a liquid crystal layer sandwiched between the color filter substrate and the array substrate.

[0098] For example, when the display panel 200 is a liquid crystal display panel (LCD), the display panel 200 may include an upper polarizer 81, a liquid crystal cell 82 and a lower polarizer 83 stacked in sequence, with the upper polarizer 81 located on the side of the liquid crystal cell 82 away from the reflector 20.

[0099] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A backlight module, characterized in that, include: The frame includes a base plate and a side frame disposed on one side of the base plate, the base plate and the side frame forming an accommodating cavity; A reflective sheet is disposed on one side of the base plate and within the receiving cavity; A light guide plate is disposed on the side of the reflector away from the base plate. The side end face of the light guide plate includes a first light guide end face. The side frame located on the inner surface of the accommodating cavity includes a first frame surface disposed opposite to the first light guide end face. Multiple light sources are disposed at least between the first light guide end face and the first frame face; A light modulation structure film is located on the side of the light guide plate away from the reflective sheet; The light modulation structure film includes at least one of an inverse prism film and at least one periodic stacked anti-reflection film. The periodic stacked anti-reflection film includes multiple layers of birefringent true zero-order waveplates and multiple layers of non-birefringent materials, with the birefringent true zero-order waveplates and non-birefringent materials alternating.

2. The backlight module according to claim 1, characterized in that, The light modulation structure film includes at least one of the reverse prism films; The reverse prism film includes a first prism film body and a plurality of first prisms located on the side of the first prism film body close to the light guide plate and protruding toward the light guide plate; The light guide plate is a V-cut type light guide plate.

3. The backlight module according to claim 2, characterized in that, The light modulation structure film also includes a prism sheet, which is located between the light guide plate and the reverse prism film; The prism sheet includes a second prism film body and a plurality of second prisms located on the side of the second prism film body away from the light guide plate and protruding away from the light guide plate.

4. The backlight module according to claim 3, characterized in that, The first prism includes a first prism surface near the first light-guiding end face and a second prism surface away from the first light-guiding end face, with the first prism surface and the second prism surface sandwiching the first prism; the angle between the first prism surface and the first normal is 6.6 degrees to 8.6 degrees, the angle between the second prism surface and the first normal is 27.8 degrees to 29.8 degrees, and the first normal is perpendicular to the plane containing the first prism film body; and / or, The second prism includes a third prism surface near the first light-guiding end face and a fourth prism surface away from the first light-guiding end face, wherein the second prism is sandwiched between the third prism surface and the fourth prism surface; the angle between the third prism surface and the plane containing the second prism film body is 52 degrees to 54 degrees, and the angle between the fourth prism surface and the plane containing the second prism film body is 36 degrees to 38 degrees; and / or, The light guide plate includes a first light guide surface near the reflector sheet. The light guide plate includes a plurality of cuts on the first light guide surface. The cuts are V-shaped. Each cut includes a first cut surface near the first light guide end face and a second cut surface away from the first light guide end face. The angle between the first cut surface and the plane containing the first light guide surface is 1 degree to 3 degrees, and the angle between the second cut surface and the plane containing the first light guide surface is 87 degrees to 89 degrees.

5. The backlight module according to claim 1, characterized in that, The light modulation structure film includes at least one periodically stacked antireflective film; The periodically stacked antireflective coating transmits ordinary light and reflects extraordinary light.

6. The backlight module according to claim 5, characterized in that, The ordinary refractive index of the birefringent true zero-order waveplate layer is n. o The unusual optical refractive index of the birefringent true zero-order waveplate layer is n. e The refractive index of the non-birefringent material layer is the first refractive index n1; Where, n e <n o = n1.

7. The backlight module according to claim 5, characterized in that, The wavelength of the unusual light reflected by the periodically stacked antireflective coating includes 380 nm to 780 nm; and / or, At least some of the birefringent true zero-order waveplate layers have different thicknesses; and / or, At least some of the non-birefringent material layers have the same thickness.

8. The backlight module according to claim 1, characterized in that, The light modulation structure film includes at least one of the reverse prism films and at least one periodically stacked anti-reflection film. The reverse prism film is located on the side of the periodically stacked antireflective film away from the reflective sheet; The periodically stacked antireflective coating transmits ordinary light and reflects extraordinary light.

9. The backlight module according to claim 8, characterized in that, The light guide plate is a V-cut type light guide plate; The ordinary refractive index of the birefringent true zero-order waveplate layer is n. o The unusual optical refractive index of the birefringent true zero-order waveplate layer is n. e The refractive index of the non-birefringent material layer is the first refractive index n1; Where, n e <n o = n1.

10. A display module, characterized in that, The display module includes a backlight module as described in any one of claims 1 to 9, and the display module further includes a display panel located on the side of the light modulation structure film away from the reflective sheet.

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