Backlight module, display device and preparation method of display device

Abstract

The invention provides a backlight module, a display device and a preparation method of the display device. The backlight module comprises a substrate; the light-emitting unit is arranged on one side of the substrate; the first polaroid is located on the side, away from the substrate, of the light-emitting unit; the first quarter phase compensation film is located on the side, away from the substrate, of the first polaroid; the semi-transparent and semi-reflective film is located on the side, away from the substrate, of the first quarter phase compensation film; the second quarter phase compensation film is positioned on one side, deviating from the substrate, of the semi-transparent and semi-reflective film; and the second polarizing film is positioned on one side, deviating from the substrate, of the second quarter phase compensation film. The backlight module provided by the invention is light, thin and compact, the light can be uniformly diffused in the backlight module to ensure that the brightness of a screen is uniform, and the situation of local excess or too dark is avoided, so that the display device has a good dodging effect and brightness uniformity.

Description

Backlight module, display device and preparation method of display device TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a backlight module, a display device and a preparation method of the display device. BACKGROUND

[0002] LED (Light Emitting Diode) is widely used in liquid crystal display products because of its wide color gamut, fast response, energy saving and high efficiency, long service life and other advantages.

[0003] The existing LED backlight module usually includes a plurality of components such as a light guide plate, and the overall thickness of the backlight module is relatively thick, which is not conducive to the light and thin of the product.

[0004] SUMMARY

[0005] The present application provides a backlight module, a display device and a preparation method of the display device.

[0006] The first aspect of the present application provides a backlight module, comprising:

[0007] a substrate;

[0008] a light emitting unit arranged on one side of the substrate;

[0009] a first polarizing plate located on the side of the light emitting unit away from the substrate;

[0010] a first quarter phase compensation film located on the side of the first polarizing plate away from the substrate;

[0011] a semi-transmissive and semi-reflective film located on the side of the first quarter phase compensation film away from the substrate;

[0012] a second quarter phase compensation film located on the side of the semi-transmissive and semi-reflective film away from the substrate;

[0013] a second polarizing plate located on the side of the second quarter phase compensation film away from the substrate.

[0014] In some embodiments, the backlight module further comprises a first substrate arranged between the first quarter phase compensation film and the semi-transmissive and semi-reflective film;

[0015] and / or a second substrate arranged between the second quarter phase compensation film and the semi-transmissive and semi-reflective film.

[0016] The backlight module of the related technology includes a light guide plate and the like structure, and converts a point light source or a line light source into a uniformly distributed surface light source by using the light guide plate and the like structure, to provide a bright and uniform backlight for a display device. The backlight module provided by the embodiments of the present application omits the light guide plate and the like structure, and adopts a semi-transmissive and semi-reflective film, a polarizing plate and a quarter phase compensation film to realize uniform light. The thickness of the semi-transmissive and semi-reflective film, the polarizing plate and the quarter phase compensation film in the backlight module is thinner than the thickness of the light guide plate and the like structure in the related technology, so that the overall thickness of the backlight module can be thinned, the backlight module can avoid occupying too much space, and the thinning and compactness of the display device can be realized. The light emitted by the light emitting unit can be uniformly diffused after multiple reflections in the backlight module under the action of the semi-transmissive and semi-reflective film, the polarizing plate and the quarter phase compensation film, the screen brightness is uniform, the local over-bright or over-dark situation is avoided, the display device has good uniform light effect and brightness uniformity, and the color performance of the display device can be improved, to provide a comfortable visual experience for the user.

[0017] In some embodiments, the backlight module further comprises a first microlens array layer arranged between the first quarter phase compensation film and the semi-transmissive and semi-reflective film.

[0018] And / or, the backlight module further comprises a second microlens array layer arranged between the second quarter phase compensation film and the semi-transmissive and semi-reflective film.

[0019] In some embodiments, the backlight module further comprises a first planarization layer arranged between the first quarter phase compensation film and the first microlens array layer, and the refractive index of the first microlens array layer is greater than the refractive index of the first planarization layer.

[0020] And / or, the backlight module further comprises a second planarization layer arranged between the second quarter phase compensation film and the second microlens array layer, and the refractive index of the second microlens array layer is greater than the refractive index of the second planarization layer.

[0021] In some embodiments, the backlight module further comprises a color conversion film arranged between the light emitting unit and the first polarizing plate.

[0022] Or, the color conversion film is arranged on the side of the second polarizing plate away from the substrate.

[0023] In some embodiments, in the case that the color conversion film is arranged between the light emitting unit and the first polarizing plate, the color conversion film and the light emitting unit are integrally arranged.

[0024] In some embodiments, the backlight module further comprises a prism film arranged on the side of the color conversion film away from the substrate.

[0025] In some embodiments, the backlight module further comprises a reflective layer disposed between the light emitting unit and the substrate.

[0026] In some embodiments, the light emitting unit is located on a side of the reflective layer away from the substrate, or the light emitting unit is located on a side of the backlight module.

[0027] A second aspect of the embodiments of the present application provides a display device, comprising a liquid crystal module and the backlight module described above.

[0028] In some embodiments, the liquid crystal module comprises a liquid crystal display screen and a third polarizer located on a side of the liquid crystal display screen facing the backlight module.

[0029] In some embodiments, the liquid crystal module comprises a liquid crystal display screen, and in the case that the color conversion film is disposed between the light emitting unit and the first polarizer, the liquid crystal display screen is attached to a side of the second polarizer away from the substrate.

[0030] A third aspect of the embodiments of the present application provides a preparation method of a display device, comprising:

[0031] disposing the light emitting unit on a side of the substrate;

[0032] preparing the semi-transmissive and semi-reflective film, and sequentially preparing the first quarter phase compensation film and the first polarizer on a side of the semi-transmissive and semi-reflective film, and preparing the second quarter phase compensation film and the second polarizer on the other side;

[0033] attaching the first polarizer to a side of the substrate on which the light emitting unit is disposed;

[0034] stacking the liquid crystal module on the second polarizer.

[0035] In some embodiments, the preparation method further comprises:

[0036] preparing the first substrate, preparing the first microlens array layer between the first substrate and the first quarter phase compensation film, and preparing the semi-transmissive and semi-reflective film on a side of the first substrate away from the first microlens array layer.

[0037] In some embodiments, the preparation method further comprises:

[0038] preparing the second substrate, sequentially preparing the second quarter phase compensation film and the second polarizer on a side of the second substrate, and attaching the semi-transmissive and semi-reflective film to the other side of the second substrate.

[0039] In some embodiments, the preparation method further comprises:

[0040] attaching the color conversion film between the light emitting unit and the first polarizer, or attaching the color conversion film on a side of the second polarizer facing away from the substrate.

[0041] In some embodiments, the preparation method further comprises: attaching the prism film on a side of the color conversion film facing away from the substrate.

[0042] It should be understood that the general description above and the detailed description below are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0043] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0044] FIG. 1 is a structural schematic diagram of a display device according to an embodiment of the present application;

[0045] FIG. 2 is a light path schematic diagram of the display device shown in FIG. 1;

[0046] FIG. 3 is a structural schematic diagram of another display device according to an embodiment of the present application;

[0047] FIG. 4 is a structural schematic diagram of still another display device according to an embodiment of the present application;

[0048] FIG. 5 is a structural schematic diagram of still another display device according to an embodiment of the present application;

[0049] FIG. 6 is a structural schematic diagram of still another display device according to an embodiment of the present application;

[0050] FIG. 7 is a structural schematic diagram of still another display device according to an embodiment of the present application;

[0051] FIG. 8 is a structural schematic diagram of still another display device according to an embodiment of the present application;

[0052] FIG. 9 is a structural schematic diagram of still another display device according to an embodiment of the present application;

[0053] FIG. 10 is a structural schematic diagram of still another display device according to an embodiment of the present application. DETAILED DESCRIPTION

[0054] The backlight module, display device and preparation method of the display device according to the embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the features in the following embodiments and implementation manners can be complementary or combined with each other.

[0055] A first aspect of the present application provides a backlight module 100 as shown in FIG. 1, the backlight module 100 comprises a substrate 10, a light emitting unit 20, a semi-transmissive and semi-reflective film 30, a first quarter phase compensation film 41, a second quarter phase compensation film 42, a first polarizer 51 and a second polarizer 52. Among them, the light emitting unit 20 is arranged on one side of the substrate 10; the first polarizer 51 is located on the side of the light emitting unit 20 away from the substrate 10; the first quarter phase compensation film 41 is located on the side of the first polarizer 51 away from the substrate 10; the semi-transmissive and semi-reflective film is located on the side of the first quarter phase compensation film 41 away from the substrate 10; the second quarter phase compensation film 42 is located on the side of the semi-transmissive and semi-reflective film 30 away from the substrate 10; the second polarizer 52 is located on the side of the second quarter phase compensation film 42 away from the substrate 10.

[0056] The backlight module 100 provided by the embodiment of the present application omits the light guide plate and the like structure, the thickness of each film layer component in the backlight module 100 is thinner than the thickness of the light guide plate and the like structure, which can make the overall thickness of the backlight module 100 thinner, avoid the backlight module 100 occupying too much space, and be beneficial to realizing the lightness and thinness and compactness of the display device. The light emitted by the light emitting unit 20 can be uniformly diffused after multiple reflections in the backlight module 100 under the action of the semi-transmissive and semi-reflective film 30, the polarizer and the quarter phase compensation film 41, which ensures the uniformity of screen brightness, avoids the occurrence of local over-brightness or over-darkness, makes the display device have good light uniformity effect and brightness uniformity, and is beneficial to improving the color performance of the display device and providing comfortable visual experience for users.

[0057] Each light emitting unit 20 comprises at least one light emitting element, and the light emitting element can comprise an inorganic light emitting diode with a size of hundreds of microns or less, wherein the inorganic light emitting diode with a size of hundreds of microns or less can be a mini LED or a micro LED. The size range of the mini LED is about 100 μm-500 μm, and the size of the micro LED is less than 100 μm. The light emitting unit 20 can be a blue light LED or a white light LED.

[0058] The first polarizer 51 and the second polarizer 52 are reflective polarizers. The first polarizer 51 and the second polarizer 52 can selectively reflect light of a certain polarization state. When non-polarized light is emitted from the light emitting unit 20 and reaches the first polarizer 51 or the second polarizer 52, only light of a specific polarization direction is reflected back to the liquid crystal layer, and light of other polarization directions is absorbed or transmitted. In some embodiments, the first polarizer 51 can be a vertical reflective polarizer. When light emitted from the light emitting unit 20 reaches the first polarizer 51, vertically polarized light is reflected, and horizontally polarized light can be transmitted through the first polarizer 51. The second polarizer 52 can be a horizontal reflective polarizer. When light emitted from the light emitting unit 20 reaches the second polarizer 52, horizontally polarized light is reflected, and vertically polarized light can be transmitted through the second polarizer 52. Of course, the first polarizer 51 can also be a horizontal reflective polarizer, and the second polarizer 52 can be a vertical reflective polarizer.

[0059] The first polarizer 51 and the second polarizer 52 can reflect light that cannot pass through the polarizer, so that the light forms a recycling use in the backlight module 100. In this way, the utilization efficiency of light energy can be improved, especially in the case of sufficient ambient light, the dependence on internal light reflecting units can be reduced.

[0060] The first quarter phase compensation film 41 and the second quarter phase compensation film 42 adjust the phase of light by precisely controlling the optical thickness of the film layer (i.e., the propagation distance of light in the film is equivalent to one quarter of the wavelength of light). Light usually passes through different film layers during propagation, and its phase may change accordingly. The first quarter phase compensation film 41 and the second quarter phase compensation film 42 are designed so that when light passes through the phase compensation film, it can obtain a phase difference of π / 2, which is one quarter of the phase difference accumulated before passing through. A phase difference of π / 2 can make the phase relationship of light flip 90°. The first quarter phase compensation film 41 and the second quarter phase compensation film 42 can produce corresponding phase delays for light of different wavelengths. The use of phase compensation films can improve the distribution of light.

[0061] In some embodiments, the first quarter phase compensation film 41 is a positive quarter phase compensation film, which can make the light wave passing through the phase compensation film delayed by exactly one quarter phase relative to the light wave not passing through the film; the second quarter phase compensation film 42 is a negative quarter phase compensation film, which can make the light wave passing through it delayed by a negative quarter phase relative to the light wave not passing through the film.

[0062] The semi-transmissive and semi-reflective film 30 can realize partial reflection and partial transmission of incident light. When external ambient light irradiates the semi-transmissive and semi-reflective film 30, part of the light is reflected back to the user's eyes, so that even without an internal backlight, partial display function can be realized by means of ambient light, thereby reducing energy consumption. Of course, the light emitted by the light emitting unit 20 can also pass through the semi-transmissive and semi-reflective film 30 and be reflected multiple times in the backlight module to achieve good uniform light effect.

[0063] The light path of the backlight module of the present application will be described below taking FIG. 2 as an example. The first polarizer 51 is a vertical reflective polarizer, the second polarizer 52 is a horizontal reflective polarizer, the first quarter phase compensation film 41 is a positive quarter phase compensation film, and the second quarter phase compensation film 42 is a negative quarter phase compensation film. Two light paths are shown in FIG. 2: light path A and light path B.

[0064] In light path A, after the light is emitted from the light emitting unit 20 and passes through the first polarizer 51, horizontal linearly polarized light is formed. The horizontal linearly polarized light enters the first quarter phase compensation film 41 and is decomposed into two mutually perpendicular polarization components, and one of the components is quarter-wavelength different from the other component. The two polarization components are recombined to form left-handed circularly polarized light when exiting. After the circularly polarized light passes through the semi-transmissive and semi-reflective film 30, part of the light is transmitted from the semi-transmissive and semi-reflective film 30, and after passing through the second quarter phase compensation film 42, the circularly polarized light reverts to horizontal linearly polarized light. The horizontal linearly polarized light reaches the second polarizer 52 and is reflected and transmitted through the second quarter phase compensation film 42 to exit. The light is reflected at the semi-transmissive and semi-reflective film 30 and again reaches the second quarter phase compensation film 42. Since the horizontal linearly polarized light passes through the second quarter phase compensation film 42 twice, the light wave is delayed by exactly one half phase, so the horizontal linearly polarized light becomes vertical linearly polarized light, and the light can be transmitted through the second polarizer 52 to exit.

[0065] In light path B, after the light is emitted from the light emitting unit 20 and passes through the first polarizer 51, horizontal linearly polarized light is formed. The horizontal linearly polarized light passes through the first quarter phase compensation film 41 to form left-handed circularly polarized light. The circularly polarized light reaches the semi-transmissive and semi-reflective film 30, and part of the light is reflected by the semi-transmissive and semi-reflective film 30. The reflected light passes through the second quarter phase compensation film 42, and the circularly polarized light becomes vertical linearly polarized light. The vertical linearly polarized light reaches the first polarizer 51, is reflected by the first polarizer 51, and again enters the first quarter phase compensation film 41 to form circularly polarized light. After the light passes through the semi-transmissive and semi-reflective film 30 and the second quarter phase compensation film 42 in turn, the circularly polarized light reverts to vertical linearly polarized light, and the light can be transmitted through the second polarizer 52 to exit.

[0066] It should be noted that the embodiments of the present application only show two light paths, i.e. light path A and light path B, and the other light paths are similar to the two light paths, and thus will not be described herein.

[0067] In some embodiments, as shown in FIG. 1, the backlight module 100 further comprises a first substrate 61 arranged between the first quarter phase compensation film 41 and the semi-transmissive semi-reflective film 30. In this way, the light can propagate and scatter multiple times in the first substrate 61, which is conducive to making the display screen brightness more uniform, reducing local bright spots or dark areas, and improving the display quality.

[0068] In some embodiments, as shown in FIG. 1, the backlight module 100 further comprises a second substrate 62 arranged between the second quarter phase compensation film 42 and the semi-transmissive semi-reflective film 30. In this way, the light can propagate and scatter multiple times in the first substrate 61, which is conducive to making the display screen brightness more uniform, reducing local bright spots or dark areas, and improving the display quality.

[0069] In the embodiment shown in FIG. 1, the backlight module 100 comprises both the first substrate 61 and the second substrate 62, and the two substrates can make the light scattering more uniform and improve the brightness uniformity of the display device. In the embodiment shown in FIG. 3, the backlight module 100 only comprises the second substrate 62 arranged between the semi-transmissive semi-reflective film 30 and the second quarter phase compensation film 42. In some embodiments, the backlight module can only comprise the first substrate 61 arranged between the semi-transmissive semi-reflective film 30 and the first quarter phase compensation film 41. Only one layer of substrate can thin the thickness of the backlight module.

[0070] In some embodiments, as shown in FIG. 1, the backlight module 100 further comprises a first microlens array layer 71 arranged between the first quarter phase compensation film 41 and the semi-transmissive semi-reflective film 30. The first microlens array layer 71 comprises a plurality of tiny lenses, and the lens diameter can be microns. The lenses are arranged in an orderly array in the first microlens array layer 71, and the microlenses can be designed in different shapes, such as spherical, cylindrical or aspherical, etc. The microlens array can more effectively converge the light emitted by the light emitting unit 20 and uniformly distribute the light to each position of the display device, thereby improving the utilization efficiency of the light and the brightness uniformity of the display device.

[0071] In some embodiments, as shown in FIG. 4, the backlight module further comprises a second microlens array layer 72 arranged between the second quarter phase compensation film 42 and the transflector 30. The second microlens array layer 72 comprises a plurality of tiny lenses, which can be arranged in an array with a diameter of microns. The microlenses can be designed in different shapes, such as spherical, cylindrical or aspherical, etc. The microlens array can more effectively converge the light emitted by the light emitting unit 20 and uniformly distribute the light to each position of the display device, thereby improving the light utilization efficiency and the brightness uniformity of the display device.

[0072] The multiple reflections of light can be achieved by the transflector, the phase compensation film and the polarizer in the backlight module, which increases the contact times of light with the microlens array, and is more conducive to improving the light uniformity of the backlight module.

[0073] In some embodiments, as shown in FIG. 5, the backlight module 100 can be provided with both the first microlens array layer 71 and the second microlens array layer 72. In this way, the light can be finely regulated by microlenses of different levels, so that the brightness distribution of the display device is more uniform.

[0074] In some embodiments, as shown in FIG. 1, the backlight module 100 further comprises a first planarization layer 73 arranged between the first quarter phase compensation film 41 and the first microlens array layer 71, and the refractive index of the first microlens array layer 71 is greater than that of the first planarization layer 73. The first planarization layer 73 can compensate for the microscopic unevenness of the microlens array surface, so that the light can uniformly irradiate the liquid crystal panel after passing through the microlens, thereby improving the display uniformity and contrast. Selecting a material with a smaller refractive index as the first planarization layer 73 can reduce the reflection and scattering of light during the transition from the first microlens array layer 71 to the liquid crystal panel, thereby reducing light loss and improving light transmittance and utilization.

[0075] In some embodiments, as shown in FIG. 5, the backlight module 100 further comprises a second planarization layer 74 arranged between the second quarter phase compensation film 42 and the second microlens array layer 72, and the refractive index of the second microlens array layer 72 is greater than that of the second planarization layer 74. The second planarization layer 74 can compensate for the microscopic unevenness of the microlens array surface, so that the light can uniformly irradiate the liquid crystal panel after passing through the microlens, thereby improving the display uniformity and contrast. Selecting a material with a smaller refractive index as the second planarization layer 74 can reduce the reflection and scattering of light during the transition from the second microlens array layer 72 to the liquid crystal panel, thereby reducing light loss and improving light transmittance and utilization.

[0076] In some embodiments, as shown in FIG. 6, the backlight module 100 only includes the first microlens array layer 71, which is arranged above the first quarter phase compensation film 41 in a stacked manner. Such an arrangement can further reduce the thickness of the backlight module.

[0077] In some embodiments, as shown in FIG. 7, the backlight module 100 further includes a color conversion film 80 arranged between the light emitting unit 20 and the first polarizer 51. For a backlight module in which the light emitting unit 20 is a blue light LED, the color conversion film 80 can convert part of the blue light into red light and green light. The color conversion film 80 can be a fluorescent film or a quantum dot film, which absorbs blue light and radiates light of different wavelengths through the use of materials such as fluorescent powder or quantum dots, thereby achieving full-color display. As shown in FIG. 8, the color conversion film 80 can be directly integrated with the light emitting unit 20. Such an arrangement of the backlight module 100 has higher integration and can make the overall thickness of the backlight module 100 thinner. In other embodiments, as shown in FIG. 1, the color conversion film 80 can also be arranged on the side of the second polarizer 52 facing away from the substrate 10.

[0078] In some embodiments, as shown in FIG. 1, the backlight module 100 further includes a prism film 90 arranged on the side of the color conversion film 80 facing away from the substrate 10. The prism film 90 focuses and converges the light emitted from the light emitting unit 20 in the vertical direction through the micro-prism structure on its surface, thereby enhancing the front brightness of the display device.

[0079] In some embodiments, as shown in FIG. 1, the backlight module 100 further includes a reflective layer 11 arranged between the light emitting unit 20 and the substrate 10. The reflective layer 11 can reflect the light that is not effectively utilized back into the backlight assembly, so that it can participate in light conduction and diffusion again, thereby improving the utilization rate of the light source and reducing the loss of light energy.

[0080] In some embodiments, as shown in FIG. 1, the light emitting unit 20 is located on the side of the reflective layer 11 facing away from the substrate 10, i.e., the backlight module 100 is a direct-lit backlight module. The direct-lit backlight module has higher brightness uniformity and better dynamic range, because it can achieve local dimming, and each light emitting unit can be independently switched on or off or adjusted in brightness, thereby enhancing the picture contrast.

[0081] In some embodiments, as shown in FIG. 9, the light emitting unit 20 is located on the side of the backlight module 100, i.e., the backlight module 100 is a side-lit backlight module. Light is guided from the edge and uniformly diffused to the entire screen. Since the side-lit backlight module does not need to arrange a large number of light emitting units on the substrate, the thickness of the backlight module can be reduced. In the embodiment shown in FIG. 9, the light emitting unit can be a white light LED without a color conversion film, so as to make the backlight module thinner.

[0082] The second aspect of the present application provides a display device, which comprises a liquid crystal module 200 and the backlight module 100 described above.

[0083] In some embodiments, as shown in FIG. 1, the liquid crystal module 200 comprises a liquid crystal display screen 201 and a third polarizer 202 located on the side of the liquid crystal display screen 201 facing the backlight module 100. The third polarizer 202 can convert unpolarized light into polarized light, and use the rotation property of the liquid crystal material to the polarized light to achieve on-off control of the light, thereby achieving the purpose of displaying images.

[0084] In some embodiments, as shown in FIG. 10, when the color conversion film 80 is arranged between the light emitting unit 20 and the first polarizer 51, the liquid crystal display screen 201 is directly arranged on the side of the second polarizer 52 away from the substrate 10. In this embodiment, the second polarizer 52 can simultaneously serve as the lower polarizer of the liquid crystal display screen 201, so that the thickness of the display device can be reduced.

[0085] The third aspect of the present application provides a preparation method of a display device, comprising the following steps:

[0086] Step 301: arranging the light emitting unit 20 on one side of the substrate 10;

[0087] Step 302: preparing the semi-transmissive and semi-reflective film 30, and sequentially preparing the first quarter phase compensation film 41 and the first polarizer 51 on one side of the semi-transmissive and semi-reflective film 30, and preparing the second quarter phase compensation film 42 and the second polarizer 52 on the other side of the semi-transmissive and semi-reflective film 30;

[0088] Step 303: adhering the first polarizer 51 to the side of the substrate 10 provided with the light emitting unit 20;

[0089] Step 304: laminating the liquid crystal module 200 on the second polarizer 52.

[0090] Each film layer of the display device can be prepared in a stacking manner or an integrated manner, or in a stacking + integrated manner. In the stacking manner, each film layer is stacked in order, and the cost of the stacking manner is relatively low, but the thickness of the display device may be relatively large. In the integrated manner, the integration between the film layers is more compact, which can reduce the gap between the film layers and significantly reduce the thickness of the display device as a whole.

[0091] In some embodiments, the material of the semi-transmissive and semi-reflective film 30 can be a metal material such as aluminum or silver.

[0092] In some embodiments, the material of the first quarter phase compensation film 41 and the second quarter phase compensation film 42 can be optical plastic or polymer with high transparency and specific birefringence, such as polyvinyl alcohol, polyethylene terephthalate, etc.

[0093] In some embodiments, the material of the first polarizer 51 and the second polarizer 52 can be polyvinyl alcohol, triacetate cellulose, polyester, polycarbonate, etc. polymer materials.

[0094] In some embodiments, step 302 further comprises preparing the first substrate 61, preparing the first microlens array layer 71 between the first substrate 61 and the first quarter phase compensation film 41, and preparing the transflective film 30 on the side of the first substrate 61 away from the first microlens array layer 71. The diameter of each microlens in the first microlens array layer 71 ranges from 3 μm to 500 μm, the height ranges from 1 μm to 100 μm, and the refractive index ranges from 1.5 to 2.0.

[0095] In some embodiments, step 302 further comprises preparing the first planarization layer 73 on the side of the first microlens array layer 71 away from the transflective film 30, and the refractive index of the first planarization layer 73 ranges from 1.2 to 1.5.

[0096] In some embodiments, step 302 further comprises preparing the second substrate 62, preparing the second quarter phase compensation film 42 and the second polarizer 52 on the side of the second substrate 62 in sequence, and adhering the transflective film 30 to the other side of the second substrate 62. The diameter of each microlens in the second microlens array layer 72 ranges from 3 μm to 500 μm, the height ranges from 1 μm to 100 μm, and the refractive index ranges from 1.5 to 2.0.

[0097] In some embodiments, step 302 further comprises preparing the second planarization layer 74 on the side of the second microlens array layer 72 away from the transflective film 30, and the refractive index of the second planarization layer 74 ranges from 1.2 to 1.5.

[0098] In some embodiments, the method for preparing the display device further comprises step 305: adhering the color conversion film 80 between the light emitting unit 20 and the first polarizer 51; or adhering the color conversion film 80 to the side of the second polarizer 52 away from the substrate 10.

[0099] In some embodiments, the method for preparing the display device further comprises step 306: adhering the prism film 90 to the side of the color conversion film 80 away from the substrate 10.

Claims

1. A backlight module, characterized in that, The backlight module comprises: a substrate; a light emitting unit arranged on one side of the substrate; a first polarizer arranged on a side of the light emitting unit away from the substrate; a first quarter phase compensation film arranged on a side of the first polarizer away from the substrate; a semi-transmissive and semi-reflective film arranged on a side of the first quarter phase compensation film away from the substrate; a second quarter phase compensation film arranged on a side of the semi-transmissive and semi-reflective film away from the substrate; a second polarizer arranged on a side of the second quarter phase compensation film away from the substrate.

2. The backlight module of claim 1, wherein, The backlight module further comprises a first substrate arranged between the first quarter phase compensation film and the semi-transmissive and semi-reflective film; and / or, a second substrate arranged between the second quarter phase compensation film and the semi-transmissive and semi-reflective film.

3. The backlight module of claim 1, wherein, The backlight module further comprises a first microlens array layer arranged between the first quarter phase compensation film and the semi-transmissive and semi-reflective film; and / or, the backlight module further comprises a second microlens array layer arranged between the second quarter phase compensation film and the semi-transmissive and semi-reflective film.

4. The backlight module of claim 3, wherein, The backlight module further comprises a first planarization layer arranged between the first quarter phase compensation film and the first microlens array layer, wherein the refractive index of the first microlens array layer is greater than the refractive index of the first planarization layer; and / or, the backlight module further comprises a second planarization layer arranged between the second quarter phase compensation film and the second microlens array layer, wherein the refractive index of the second microlens array layer is greater than the refractive index of the second planarization layer.

5. The backlight module of claim 1, wherein, The backlight module further comprises a color conversion film arranged between the light emitting unit and the first polarizer; or, a color conversion film arranged on a side of the second polarizer away from the substrate.

6. The backlight module of claim 5, wherein, In the case where the color conversion film is arranged between the light emitting unit and the first polarizer, the color conversion film and the light emitting unit are integrally arranged.

7. The backlight module of claim 5, wherein, The backlight module further comprises a prism film arranged on a side of the color conversion film away from the substrate.

8. The backlight module of claim 1, wherein, The backlight module further comprises a reflective layer arranged between the light emitting unit and the substrate.

9. The backlight module of claim 8, wherein, The light emitting unit is arranged on a side of the reflective layer away from the substrate, or the light emitting unit is arranged on a side of the backlight module.

10. A display device, characterized by comprising: The display device comprises a liquid crystal module and the backlight module according to any one of claims 1 to 9.

11. The display device according to claim 10, wherein The liquid crystal module comprises a liquid crystal display screen and a third polarizer arranged on a side of the liquid crystal display screen facing the backlight module.

12. The display device according to claim 10, wherein The liquid crystal module comprises a liquid crystal display screen, and in the case where the color conversion film is arranged between the light emitting unit and the first polarizer, the liquid crystal display screen is attached to a side of the second polarizer away from the substrate.

13. A production method of a display device, the production method being used for producing the display device according to claim 10, characterized by, The preparation method comprises: arranging the light emitting unit on one side of the substrate; preparing the semi-transmissive and semi-reflective film, and sequentially preparing the first quarter phase compensation film and the first polarizer on one side of the semi-transmissive and semi-reflective film, and preparing the second quarter phase compensation film and the second polarizer on the other side at one time; attaching the first polarizer to a side of the substrate provided with the light emitting unit; The liquid crystal module is laminated on the second polarizer.

14. The method of claim 13, wherein, The preparation method further comprises: The first substrate is prepared, the first microlens array layer is prepared between the first substrate and the first quarter phase compensation film, and the semi-transmission semi-reflection film is prepared on the side of the first substrate away from the first microlens array layer.

15. The method of claim 14, wherein, The preparation method further comprises: The second substrate is prepared, the second quarter phase compensation film and the second polarizer are sequentially prepared on one side of the second substrate, and the other side of the second substrate is attached to the semi-transmission semi-reflection film.

Images