Backlight module and display device

Abstract

The invention discloses a backlight module and a display device. In one specific implementation mode, the backlight module comprises a light-emitting layer and a light adjusting layer arranged on the light-emitting side of the light-emitting layer, and the light-emitting layer comprises a plurality of light-emitting units; the light adjusting layer comprises an optical waveguide layer, a first light homogenization structure, a first reflection structure and a second reflection structure, the first light homogenization structure is located on the side, close to the light emitting layer, of the optical waveguide layer, and the first reflection structure is located on the side, close to or away from the light emitting layer, of the optical waveguide layer; the second reflection structure is located on the side, close to the light emitting layer, of the first light homogenization structure, the orthographic projection of the light emitting unit on the optical waveguide layer covers the orthographic projection of the first reflection structure on the optical waveguide layer, and the orthographic projection of the second reflection structure on the optical waveguide layer is at least partially overlapped with the orthographic projection of the first light homogenization structure on the optical waveguide layer. The orthographic projection of the second reflection structure on the optical waveguide layer surrounds the orthographic projection of the light-emitting unit on the optical waveguide layer.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and more specifically, to a backlight module and a display device. Background Art

[0002] Backlight modules with LED (Light Emitting Diode) as backlight sources have the advantages of wide color gamut, excellent image quality, long service life, thin and beautiful appearance, strong stability, and green environmental protection, and are widely used in liquid crystal display products. In particular, direct-type LED backlight sources have the advantages of high brightness, good uniformity, high energy utilization, and high contrast, and are widely used in large-size liquid crystal panels with excellent performance.

[0003] However, in actual applications, since the direct-type LED backlight source is not equipped with a light guide plate, in order to ensure the uniformity of the backlight source brightness, a larger light mixing height is required to allow the light emitted to mix freely, or more diffusion plates are used to achieve the required brightness uniformity, resulting in the problem of a larger thickness of the backlight module. Summary of the invention

[0004] The purpose of the present disclosure is to provide a backlight module and a display device to solve at least one of the problems existing in the prior art.

[0005] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0006] A first aspect of the present disclosure provides a backlight module, comprising a light-emitting layer and a light-adjusting layer arranged on a light-emitting side of the light-emitting layer, wherein the light-emitting layer comprises a plurality of light-emitting units;

[0007] The light adjustment layer includes an optical waveguide layer, a first light homogenizing structure, a first reflective structure, and a second reflective structure. The first light homogenizing structure is located on a side of the optical waveguide layer close to the light-emitting layer, the first reflective structure is located on a side of the optical waveguide layer close to or far from the light-emitting layer, the second reflective structure is located on a side of the first light homogenizing structure close to the light-emitting layer, the orthographic projection of the light-emitting unit on the optical waveguide layer covers the orthographic projection of the first reflective structure on the optical waveguide layer, the orthographic projection of the second reflective structure on the optical waveguide layer at least partially overlaps with the orthographic projection of the first light homogenizing structure on the optical waveguide layer, and the orthographic projection of the second reflective structure on the optical waveguide layer surrounds the orthographic projection of the light-emitting unit on the optical waveguide layer.

[0008] The light emitted from the light emitting layer is homogenized and then emitted through the light regulating layer. The light regulating layer is integrated with a first reflection structure, a second reflection structure and a light homogenization structure on the side of the light waveguide layer close to the light emitting layer and the side away from the light emitting layer, thereby reducing the light mixing height and the overall thickness required for the backlight module; part of the light entering the light waveguide layer is uniformly emitted after multiple reflections and scattering, and the first reflection structure arranged on the side of the light waveguide layer close to or away from the light emitting layer transmits more light into the light waveguide, further improving the light efficiency, and can avoid most of the light being integrated at a positive viewing angle, causing the problem of poor brightness uniformity of the backlight module; the overall thickness of the backlight module is less than 1 cm, which improves the light efficiency and ensures the brightness uniformity of the backlight module while reducing the thickness of the backlight module.

[0009] Optionally, the first light homogenizing structure is a first light homogenizing structure disposed on a surface of the light waveguide layer close to the light emitting layer, or the first light homogenizing structure is formed by a surface of the light waveguide layer close to the light emitting layer.

[0010] Optionally, the first reflective structure is a reflective layer structure, and the reflective layer structure is located on a side of the optical waveguide layer away from the light-emitting layer.

[0011] Optionally, the reflectivity of the reflective layer structure is greater than or equal to 20%.

[0012] Optionally, the first reflective structure is a light coupling structure.

[0013] Optionally, the light coupling structure is a tilted grating or a blazed grating.

[0014] Optionally, the light regulating layer further comprises a second light homogenizing structure, which is located on a side of the optical waveguide layer away from the light emitting layer, and an orthographic projection of the second light homogenizing structure on the optical waveguide layer surrounds an orthographic projection of the light emitting unit on the optical waveguide layer.

[0015] Optionally, the light regulation layer further comprises a third light homogenizing structure arranged on a side of the light emitting unit close to the light waveguide layer, and the orthographic projection of the light emitting unit on the light waveguide layer covers the orthographic projection of the third light homogenizing structure on the light waveguide layer.

[0016] Optionally, the backlight module further includes a protective layer located on a side of the light regulating layer away from the light emitting layer.

[0017] A second aspect of the present disclosure provides a display device, comprising the backlight module provided by the first aspect of the present disclosure.

[0018] The beneficial effects of the present disclosure are as follows:

[0019] The technical solution disclosed in the present invention provides a light adjustment layer on the light-emitting side of the light-emitting layer to homogenize the light emitted by the light-emitting layer before emitting it. The light adjustment layer includes an optical waveguide layer, a first light homogenizing structure provided on the side of the optical waveguide layer close to the light-emitting layer, a first reflective structure provided on the side of the optical waveguide layer close to or away from the light-emitting layer, and a second reflective structure provided on the side of the first light homogenizing structure close to the light-emitting layer. Through the optical waveguide layer, the first light homogenizing structure provided on the side of the optical waveguide layer close to the light-emitting layer, and the second reflective structure provided on the side of the first light homogenizing structure close to the light-emitting layer, part of the light entering the optical waveguide layer is uniformly emitted after multiple reflections and scattering. The first reflective structure provided on the side of the optical waveguide layer close to or away from the light-emitting layer transmits more light into the optical waveguide, further improving the light efficiency, and avoiding the problem of poor brightness uniformity of the backlight module caused by integrating most of the light at a positive viewing angle. The overall thickness of the backlight module is less than 1 cm, which reduces the thickness of the backlight module while improving the light efficiency and ensuring the brightness uniformity of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific implementation methods of the present disclosure are further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 A schematic structural diagram of a display device in the related art is shown.

[0022] Figure 2 A schematic structural diagram of a backlight module provided by an embodiment of the present disclosure is shown.

[0023] Figure 3 A schematic structural diagram of a backlight module provided by another embodiment of the present disclosure is shown.

[0024] Figure 4 A schematic structural diagram of a backlight module provided by another embodiment of the present disclosure is shown.

[0025] Figure 5 A schematic structural diagram of a backlight module provided by another embodiment of the present disclosure is shown.

[0026] Figure 6 A schematic structural diagram of a backlight module provided by another embodiment of the present disclosure is shown.

[0027] Figure 7 A schematic structural diagram of a backlight module provided by another embodiment of the present disclosure is shown.

[0028] Figure 8 A schematic structural diagram of a backlight module provided by another embodiment of the present disclosure is shown.

[0029] Fig. 9 A schematic structural diagram of a backlight module provided by another embodiment of the present disclosure is shown.

[0030] Fig.10 A schematic structural diagram of a light-emitting layer provided by an embodiment of the present disclosure is shown.

[0031] Fig.11 A schematic structural diagram of a light-emitting layer provided in another embodiment of the present disclosure is shown.

[0032] Fig.12 A preparation flow chart of a backlight module provided by an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0033] The terms “on”, “formed on” and “disposed on” in the present disclosure may mean that one layer is directly formed or disposed on another layer, or may mean that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers.

[0034] It should be noted that, although the terms "first", "second", etc. may be used herein to describe various parts, components, elements, regions, layers and / or parts, these parts, components, elements, regions, layers and / or parts should not be limited by these terms. Instead, these terms are used to distinguish one part, component, element, region, layer and / or part from another.

[0035] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. It can be understood that when an element such as a layer, a film, a region or a substrate is referred to as being "on" or "under" another element, the element can be "directly" located "on" or "under" another element, or there can be an intermediate element.

[0036] In order to ensure the uniformity of light output from the LED backlight display module, the LED backlight display device in the related art needs to be provided with at least two layers of scattering films, and the light mixing height thereof is relatively large. Figure 1As shown, it is a schematic diagram of the structure of an existing LED backlight display device, which includes a substrate 10, an LED light source 20, a color transfer film 30, a first scattering film 40, a second scattering film 50 and a liquid crystal panel 60 which are stacked in sequence. With this structure, light emitted from the LED light source 20 to the color transfer film 30 is converted into white light, and the white light is diffused by the first scattering film 40 and the second scattering film 50 in sequence before reaching the liquid crystal panel 60 to improve the uniformity of the light. Due to the large light mixing height and the large number of diffusion film layers, the existing backlight module has a large thickness, ranging from 3 to 5 cm, and its structure needs to be improved.

[0037] In view of this, the present disclosure provides a backlight module, such as Figure 2 As shown, the backlight module includes a light-emitting layer 101 and a light-adjusting layer arranged on the light-emitting side of the light-emitting layer 101;

[0038] Wherein, the light-emitting layer 101 includes a plurality of light-emitting units 102;

[0039] The light adjustment layer includes a light waveguide layer 103, a first light homogenizing structure 104, a first reflective structure 106 and a second reflective structure 105.

[0040] The first light homogenizing structure 104 is located on a side of the light waveguide layer 103 close to the light emitting layer 101;

[0041] The first reflective structure 106 is located on a side of the optical waveguide layer 103 close to or away from the light emitting layer 101;

[0042] The second reflective structure 105 is located on a side of the first light homogenizing structure 104 close to the light emitting layer 101;

[0043] The orthographic projection of the light emitting unit 102 on the optical waveguide layer 103 covers the orthographic projection of the first reflective structure 106 on the optical waveguide layer 103, the orthographic projection of the second reflective structure 105 on the optical waveguide layer 103 at least partially overlaps with the orthographic projection of the first light homogenizing structure 104 on the optical waveguide layer 103, and the orthographic projection of the second reflective structure 105 on the optical waveguide layer 103 surrounds the orthographic projection of the light emitting unit 102 on the optical waveguide layer 103;

[0044] The light emitted from the light emitting layer 101 enters the optical waveguide layer 103, part of the light is emitted directly, and the other part of the light is totally reflected in the optical waveguide structure. After the part of the light reaches the first light homogenizing structure 104, the light is scattered and enters the second reflecting structure 105 covering the first light homogenizing structure 104 and is reflected to the first light homogenizing structure 104. The light is further diffused, and the direction of the light is changed to enter the first light homogenizing structure 104, and is emitted from the surface of the optical waveguide layer 103 away from the light emitting layer 101 to obtain homogenized light. The first reflecting structure 106 can make the light more uniform, avoid most of the light being concentrated at the normal viewing angle, and cause the problem of poor brightness uniformity. The light entering the first reflecting structure 106 will be reflected back to the optical waveguide layer 103 again, and the light is further scattered, so that more light effects are emitted through the optical waveguide.

[0045] In this embodiment, a light regulating layer is arranged on the light-emitting side of the light-emitting layer 101 to homogenize the light emitted by the light-emitting layer 101 and then emit it. The light regulating layer includes an optical waveguide layer 103, a first light homogenizing structure 104 arranged on the side of the optical waveguide layer 103 close to the light-emitting layer 101, a first reflective structure 106 arranged on the side of the optical waveguide layer 103 close to or away from the light-emitting layer 101, and a second reflective structure 105 arranged on the side of the first light homogenizing structure 104 close to the light-emitting layer 101; through the optical waveguide layer 103 and the first light homogenizing structure 104 arranged on the side of the optical waveguide layer 103 close to the light-emitting layer 101, a light-regulating layer 104 is arranged on the side of the light-regulating layer 103 close to the light-emitting layer 101. 04 and a second reflective structure 105 arranged on the first light homogenizing structure 104 near the light emitting layer 101, so that part of the light entering the optical waveguide layer 103 is uniformly emitted after multiple reflections and scattering, and the first reflective structure 106 arranged on the optical waveguide layer 103 near or far from the light emitting layer 101 transmits more light into the optical waveguide, further improving the light efficiency, and can avoid most of the light being integrated at the positive viewing angle, causing the problem of poor brightness uniformity of the backlight module; the overall thickness of the backlight module is less than 1 cm, which reduces the thickness of the backlight module while improving the light efficiency and ensuring the brightness uniformity of the backlight module.

[0046] In a specific example, the optical waveguide layer is, for example, an optical waveguide glass. The optical waveguide glass has a high refractive index and is composed of a high refractive index core layer and a low refractive index cladding layer. It can totally reflect light at a specific angle and limit the light at a specific angle to propagate inside the waveguide. For example, light with an incident angle greater than thirty degrees is totally reflected in the optical waveguide glass, and light with an incident angle less than thirty degrees is directly emitted. Part of the light totally reflected in the optical waveguide glass is reflected into the light homogenization structure, and the direction of the light is changed by the light homogenization structure and the reflective metal covering the light homogenization structure, so that the outgoing light of the backlight module is further diffused.

[0047] It should be noted that the above limitation that total reflection occurs when the incident angle is greater than thirty degrees is only an example.

[0048] In a specific example, the light-emitting layer includes a plurality of light-emitting units. In order to improve light mixing uniformity, the density of the light-emitting units in the edge area of ​​the backlight module is greater than the density of the light-emitting units in other areas.

[0049] In a specific example, the first light homogenizing structure 104 is a first light homogenizing structure 104 disposed on a surface of the optical waveguide layer 103 on a side close to the light emitting layer 101, and the side of the first light homogenizing structure 104 close to the light emitting layer 101 is uneven, so that the light incident on the first light homogenizing structure 104 can be diffused more evenly.

[0050] Specifically, the surface of the first light homogenizing structure 104 close to the light emitting layer 101 has a plurality of protrusions, which may be hemispherical, conical or prism-shaped. Of course, the shape of the protrusions is not limited to hemispherical, conical or prism-shaped, and other shapes may also be used.

[0051] In a specific example, if Figure 3 As shown, the first light homogenization structure is provided on the entire surface of the light waveguide glass near the light emitting layer to reduce the process cost and further increase the degree of light diffusion.

[0052] In a specific example, the first light homogenizing structure 104 may be composed of a transparent polymer and reflective particles. The light homogenizing structure is an ordered or disordered micrometer-sized structure and may be manufactured by thermal reflow, nano-imprinting, or the like.

[0053] In this embodiment, the material of the first light homogenizing structure includes reflective particles, so that the light is emitted in all directions through scattering, thereby increasing the uniformity of the light.

[0054] In another specific example, Figure 4 As shown, the first light homogenizing structure 104 is formed by the surface of the light waveguide layer 103 on one side close to the light emitting layer 101 .

[0055] Specifically, a pattern transfer method is used to etch the surface of the optical waveguide layer 103 close to the light emitting layer 101 to form an uneven surface, so that the light incident on the first light homogenizing structure 104 can be diffused more evenly.

[0056] In a specific example, the first reflective structure 106 is a reflective layer structure, and the reflective layer structure is located on a side of the optical waveguide layer 103 away from the light emitting layer 101 .

[0057] Specifically, the reflective layer structure is made of metal with high reflectivity, such as metal aluminum, metal silver, etc.

[0058] In a specific example, the reflectivity of the reflective layer structure is greater than 20%; and the orthographic projection area of ​​the reflective structure on the optical waveguide layer 103 is greater than or equal to 20 square micrometers and less than or equal to 200 square micrometers.

[0059] It should be noted that, in order to further reduce the thickness of the display module, a first opening is provided on the surface of the optical waveguide layer 103 away from the light emitting layer 101 , and the reflective layer structure is embedded in the first opening.

[0060] In a specific example, the first reflective structure 106 is a light coupling structure.

[0061] In a specific example, if Figure 5 As shown, the light coupling structure is a blazed grating, and the blazed grating is located on the side of the light waveguide layer 103 close to the light emitting layer 101 to transmit more light into the light waveguide glass, thereby improving the light effect, wherein,

[0062] The blazed grating has a symmetrical structure, a blazed grating period of 200 to 600 nm, a grating height of 50 to 400 nm, a grating duty cycle of 0.2 to 0.8, a grating tilt angle of 30 to 80°, a grating material refractive index of 1.7 to 2.0, and the grating material is a transparent material without metal deposition.

[0063] It should be noted that when detecting from the design direction, the intensity of the spectrum is the largest. This phenomenon is called blaze, and this grating is called a blazed grating. Blaze greatly improves the diffraction efficiency of the grating, and is used as a coupling device for the optical waveguide layer to improve the incident efficiency of light. And it is designed to improve the +1 order diffraction efficiency, so there is no special limit on the blaze angle of the blazed grating, as long as the grating energy can be concentrated at the +1 order.

[0064] In a specific example, if Figure 6 As shown, the optical coupling structure is a tilted grating, which is arranged on the surface of the optical waveguide layer close to the light-emitting layer 101 to transmit more light into the optical waveguide glass, thereby improving the light efficiency. The tilted grating is a symmetrical structure so that basically equal amounts of +1 and -1 light enter the optical waveguide structure.

[0065] It should be noted that grating diffraction has 0th order, ±1st order, etc. Different orders have different angles and energies. By setting the parameters of the grating, most of the light energy can be concentrated at a certain angle order, thus achieving control over the direction of the light.

[0066] In a specific example, if Figure 7 As shown, the optical coupling structure is a tilted grating, and the tilted grating is arranged on the side of the optical waveguide layer away from the light emitting layer 101, wherein:

[0067] The tilted grating is a symmetrical structure.

[0068] Specifically, a metal material is deposited between the inclined grating disposed on the side of the optical waveguide layer away from the light-emitting layer and the optical waveguide glass to further increase the light reflected into the optical waveguide layer.

[0069] In a specific example, the material of the optical coupling structure is optical resin.

[0070] In a specific example, the tilted grating and the blazed grating should satisfy at least one of the following conditions to further ensure the brightness uniformity of the emitted light:

[0071] The period of the grating is greater than or equal to 200nm and less than or equal to 600nm, the grating height is greater than or equal to 50nm and less than or equal to 400nm, the grating duty cycle is greater than or equal to 0.2 and less than or equal to 0.8, the grating tilt angle is greater than or equal to 30° and less than or equal to 80°, and the refractive index of the grating material is greater than or equal to 1.7 and less than or equal to 2.

[0072] In a specific example, if Figure 8 As shown, the light adjustment layer further includes a second light homogenizing structure 109, which is located on a side of the light guide layer 103 away from the light emitting layer 101, and the orthographic projection of the second light homogenizing structure 109 on the light guide layer 103 surrounds the orthographic projection of the light emitting unit 102 on the light guide layer 103. Light emitted from the surface of the part of the light guide structure overlapping with the second light homogenizing structure 109 enters the light homogenizing structure, and the light is further diffused and emitted from the protective layer covering the second light homogenizing structure 109.

[0073] In this embodiment, the light adjustment layer further includes a second light homogenizing structure 109 located on the side of the light waveguide layer 103 away from the light emitting layer 101, which receives part of the emitted light of the light waveguide layer 103 and further disperses the light, further increasing the brightness uniformity of the backlight module.

[0074] In a specific example, if Fig. 9 As shown, the light adjustment layer further includes a third light homogenizing structure 10A disposed on a side of the light emitting unit 102 close to the optical waveguide layer 103 , and the orthographic projection of the light emitting unit 102 on the optical waveguide layer 103 covers the orthographic projection of the third light homogenizing structure 10A on the optical waveguide layer 103 .

[0075] In a specific example, if Fig.10 As shown, the light emitting layer 101 further includes a color conversion layer covering the light emitting unit 102 , and the color conversion layer includes a first color conversion layer 1081 and a second color conversion layer 1082 which are stacked.

[0076] The first color conversion layer is, for example, a red color conversion layer, and the second color conversion layer is, for example, a green color conversion layer.

[0077] It should be noted that this embodiment does not specifically limit the stacking order of the first color conversion layer and the second color conversion layer.

[0078] In a specific example, the substrate is a glass substrate, and the display device further includes white oil 10C that is arranged on a side of the glass substrate away from the light homogenizer and covers the glass substrate.

[0079] Specifically, the white oil may include resin (eg, epoxy resin, polytetrafluoroethylene resin), titanium dioxide (chemical formula TiO2) and organic solvent (eg, dipropylene glycol methyl ether), etc. The white oil may be printed using a screen printing process, and the reflectivity of the formed film layer is greater than or equal to 80%.

[0080] Specifically, the LED light-emitting chip is directly embedded in the glass substrate. After the light reflected by the first reflective structure 106 is diffused through the color conversion layer covering the light-emitting unit 102, part of the light is incident on the white oil covering the glass substrate through the glass substrate. The white oil has a high reflectivity and reflects the light onto the optical waveguide glass, further increasing the light emitted from the waveguide, thereby improving the light utilization rate and the light output uniformity of the backlight module.

[0081] In a specific example, if Fig.11 As shown, the light-emitting layer 101 further includes a color conversion layer 108 covering the light-emitting unit 102 , and the color conversion layer 108 includes a first color conversion material and a second color conversion material.

[0082] Specifically, the first color conversion material is, for example, red quantum dots, and the second color conversion material is, for example, green quantum dots.

[0083] It should be noted that the light-emitting unit of the light-emitting layer emits blue light, and the color changes to white light after passing through the color conversion layer.

[0084] Below Figure 2 The preparation process of the backlight module is described in detail by taking the backlight module shown in FIG. Fig.12 As shown:

[0085] First, a first reflective structure is fabricated on a first surface of the optical waveguide layer and patterned;

[0086] The optical waveguide layer is optical waveguide glass; the first reflective structure is reflective metal, and the reflectivity of the reflective metal is greater than or equal to 20%;

[0087] Next, a protective layer is deposited on the first surface, where the protective layer covers the first reflective metal layer and prevents the reflective metal from being scratched;

[0088] Specifically, the protective layer is a transparent inorganic film layer or a transparent adhesive material, and can be made of inorganic materials such as silicon oxide and silicon nitride, or can be made of polymer materials.

[0089] Then, a light homogenizing structure is fabricated on the second surface of the optical waveguide glass, and a concave-convex microstructure is formed on the surface of the optical waveguide glass by heat reflow, nanoimprinting, etc. to obtain a light homogenizing layer, and the light homogenizing layer is patterned to obtain a first light homogenizing structure 104;

[0090] Depositing and patterning a reflective metal on the first light homogenizing structure 104 to form a second reflective structure 105 covering the light homogenizing structure;

[0091] The second reflective structure 105 is reflective metal.

[0092] The first light homogenizing structure 104 has an arc-shaped structure, which can increase the light diffusion area and the reflection area of ​​the second reflection structure 105, thereby increasing the light utilization rate.

[0093] Next, the metal wiring 10B is manufactured and patterned, and then the substrate embedded with the LED light source is bonded to the metal wiring 10B, and white oil 10C covering the substrate is formed on the backlight side of the substrate.

[0094] It should be noted that the orthographic projection of the light-emitting area of ​​the substrate inlaid with the LED light source on the optical waveguide layer 103 covers the orthographic projection of the first reflective metal layer on the optical waveguide glass, the second reflective structure 105, that is, the orthographic projection of the second reflective metal layer on the optical waveguide glass, at least partially overlaps with the orthographic projection of the first light homogenizing structure 104 on the optical waveguide glass, and the orthographic projection of the second reflective structure 105 on the optical waveguide glass surrounds the orthographic projection of the light-emitting area on the optical waveguide glass.

[0095] By using the structure prepared as above, light is emitted from the LED light source to the optical waveguide layer, wherein part of the light meets the emission condition and is emitted directly, part of the light is reflected to the first light homogenizing structure by reflection in the optical waveguide layer, diffused to the second reflective structure by the first light homogenizing structure, reflected to the first light homogenizing structure by reflection for secondary diffusion, and part of the light meets the emission condition and is emitted from the optical waveguide layer, the back and forth propagation of light improves the utilization rate of light, and at the same time improves the uniformity of light mixing, reduces the light mixing height of the backlight module, and the first light homogenizing structure and the second reflective structure are integrated on the second surface of the optical waveguide layer, further reducing the thickness of the backlight module.

[0096] It should be noted that the LED light source can be replaced by a CCFL light source.

[0097] An embodiment of the present application provides a display device, which includes the above-mentioned backlight module.

[0098] The display device may be any product or component with a display function, such as a television, a monitor, a digital photo frame, a mobile phone, a tablet computer, etc., wherein the display device further includes a flexible circuit board, a printed circuit board and a backplane.

[0099] In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. In the embodiment of the present application, all directional indications (such as up, down, left, right, front, back, top, bottom ...) are only used to explain the relative position relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their deformations are intended to cover non-exclusive inclusions. For example, the process, method, system, product or equipment comprising a series of steps or units are not limited to the steps or units listed, but optionally also include the steps or units not listed, or optionally also include other steps or units inherent to these processes, methods, products or equipment.

[0100] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not limitations on the implementation methods of the present disclosure. For ordinary technicians in this field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present disclosure are still within the protection scope of the present disclosure.

Claims

1. A backlight module, characterized in that: It includes a light-emitting layer and a light-adjusting layer arranged on the light-emitting side of the light-emitting layer, wherein the light-emitting layer includes a plurality of light-emitting units; The light adjustment layer includes an optical waveguide layer, a first light homogenizing structure, a first reflective structure, and a second reflective structure. The first light homogenizing structure is located on a side of the optical waveguide layer close to the light-emitting layer, the first reflective structure is located on a side of the optical waveguide layer close to or far from the light-emitting layer, the second reflective structure is located on a side of the first light homogenizing structure close to the light-emitting layer, the orthographic projection of the light-emitting unit on the optical waveguide layer covers the orthographic projection of the first reflective structure on the optical waveguide layer, the orthographic projection of the second reflective structure on the optical waveguide layer at least partially overlaps with the orthographic projection of the first light homogenizing structure on the optical waveguide layer, and the orthographic projection of the second reflective structure on the optical waveguide layer surrounds the orthographic projection of the light-emitting unit on the optical waveguide layer.

2. The backlight module according to claim 1, characterized in that: The first light homogenizing structure is a first light homogenizing structure disposed on a surface of the light waveguide layer close to the light emitting layer, or the first light homogenizing structure is formed by a surface of the light waveguide layer close to the light emitting layer.

3. The backlight module according to claim 1, characterized in that: The first reflective structure is a reflective layer structure, and the reflective layer structure is located on a side of the optical waveguide layer away from the light-emitting layer.

4. The backlight module according to claim 3, characterized in that: The reflectivity of the reflective layer structure is greater than or equal to 20%.

5. The backlight module according to claim 1, characterized in that: The first reflective structure is a light coupling structure.

6. The backlight module according to claim 5, characterized in that: The light coupling structure is a tilted grating or a blazed grating.

7. The backlight module according to claim 1, characterized in that: The light regulating layer further includes a second light homogenizing structure, which is located on a side of the optical waveguide layer away from the light emitting layer, and an orthographic projection of the second light homogenizing structure on the optical waveguide layer surrounds an orthographic projection of the light emitting unit on the optical waveguide layer.

8. The backlight module according to claim 1, characterized in that: The light adjustment layer further includes a third light homogenizing structure disposed on a side of the light emitting unit close to the light waveguide layer, and the orthographic projection of the light emitting unit on the light waveguide layer covers the orthographic projection of the third light homogenizing structure on the light waveguide layer.

9. The backlight module according to claim 1, characterized in that: The backlight module further includes a protection layer located on a side of the light regulating layer away from the light emitting layer.

10. A display device, characterized in that: It comprises a display panel and a backlight module as claimed in any one of claims 1 to 9.

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