Backlight module and LCD display

Abstract

The present invention belongs to the technical field of liquid crystal display, and in particular, relates to a backlight module and a liquid crystal display. The backlight module includes: a light guide structure and a light source structure, the light guide structure includes a light guide shell made of a light-transmitting material and having a receiving cavity, a filling liquid filling the receiving cavity, and scattering particles placed in the filling liquid, the light source structure is located on one side of the light guide shell and is used to project light to the light guide shell, and a plurality of scattering particles are provided, each scattering particle is used to scatter the light in multiple directions so that the light is evenly distributed in the light guide shell. The present invention can effectively reduce the thermal expansion of the light guide plate, which is conducive to the manufacture of liquid crystal displays with narrow frames.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid crystal displays, and in particular relates to a backlight module and a liquid crystal display. Background Art

[0002] As LCD technology develops and matures, the differences in LCD technology are not large, and differentiated product technology can make products more competitive.

[0003] Currently, the light guide plates in the backlight of LCM (Liquid Crystal Display) liquid crystal modules on the market are mostly made of PMMA (polymethyl methacrylate) or PC (Polycarbonate) materials, and are also equipped with optical films such as diffusion films and reflective films.

[0004] However, when preparing ultra-thin display screens, the material expansion coefficients of these film layers and light guide plates need to be considered. When these film layers and light guide plates are assembled to the back plate, sufficient expansion gaps need to be left on the back plate, which will cause the border of the display screen to become wider and thicker, affecting not only the appearance of the entire device, but also sufficient expansion gaps need to be reserved between the liquid crystal module and the light guide plate, which will also lead to defects such as reduced light utilization efficiency. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a backlight module, aiming to solve the problem of how to guide light and reduce the thermal expansion rate of the light guide structure and improve the utilization rate of light.

[0006] To achieve the above purpose, the technical solution adopted in this application is:

[0007] In a first aspect, a backlight module is provided, which includes: a light guide structure and a light source structure, wherein the light guide structure includes a light guide shell made of a light-transmitting material and having a receiving cavity, a filling liquid filling the receiving cavity, and scattering particles placed in the filling liquid, the light source structure is located on one side of the light guide shell, the light guide shell is made of a flexible or elastic material at a position facing the light source structure and is provided with a light incident surface, the light source structure projects light toward the light incident surface, a plurality of scattering particles are provided, and each of the scattering particles is used to scatter the light in multiple directions so that the light is evenly distributed in the light guide shell.

[0008] In some embodiments, the scattering particles are spherical, and at least two of the scattering particles have different diameters.

[0009] In some embodiments, the light guide housing has a light emitting surface for the light to emit from the light guide housing, and the light emitting surface is provided with a microstructure, and the microstructure is used to increase the brightness of the light emitted from the light emitting surface.

[0010] In some embodiments, the microstructure includes a plurality of diffusion strips protruding from the light emitting surface, and the diffusion strips are arranged in sequence and at intervals.

[0011] In some embodiments, the cross-sectional shape of the diffusion strip includes at least one of a semicircular shape, a polygonal shape, or a semi-elliptical shape.

[0012] In some embodiments, the light guide housing further comprises a bottom surface disposed opposite to the light emitting surface, and the light guide structure further comprises a reflective layer disposed on the bottom surface.

[0013] In some embodiments, the light source structure includes a lamp board disposed relative to the light incident surface and lamp beads disposed on the lamp board and used to project the light toward the light incident surface.

[0014] In some embodiments, the light emitting surface of the lamp bead abuts against the light incident surface.

[0015] In some embodiments, the backlight module further includes a back plate having a placement cavity, and the light guide structure and the light source structure are both disposed in the placement cavity.

[0016] In a second aspect, a liquid crystal display is provided, which includes the backlight module. The liquid crystal display further includes a liquid crystal module, and the liquid crystal module is arranged relative to the backlight module.

[0017] The beneficial effects of the present application are as follows: the backlight module includes a light guide structure and a light source structure, the light guide structure includes a light guide shell, scattering particles and a filling liquid filled in the light guide shell, a plurality of scattering particles are distributed in the filling liquid, thereby being able to scatter the light incident on the light guide shell, and the viscous filling liquid reduces the expansion coefficient of the light guide structure, which can effectively reduce the thermal expansion of the light guide structure, and is conducive to manufacturing a liquid crystal display with a narrow frame, and the light guide shell at the light incident surface is made of a flexible or elastic material, thereby being able to arrange the light source structure close to the light incident surface, thereby improving the utilization rate of light. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of a liquid crystal display provided in an embodiment of the present application;

[0020] Figure 2 yes Figure 1 A cross-sectional schematic diagram of a liquid crystal display;

[0021] Figure 3 yes Figure 2 A local enlarged view of point A;

[0022] Figure 4 yes Figure 1 An exploded diagram of an LCD display.

[0023] Among them, the reference numerals in the figure are:

[0024] 100, liquid crystal display; 200, liquid crystal module; 201, liquid crystal panel; 202, face frame; 300, backlight module; 301, back plate; 3011, placement cavity; 302, light source structure; 3021, lamp board; 3022, lamp beads; 306, light guide structure; 303, filling liquid; 304, scattering particles; 3063, accommodating cavity; 3061, light incident surface; 3062, light exit surface; 307, diffusion strip; 308, diffusion groove; 3064, bottom surface; 310, light guide housing; DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present application.

[0026] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first" and "second" are only used for the purpose of convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0027] See also Figures 1 to 3The embodiment of the present application provides a backlight module 300, which includes: a light guide structure 306 and a light source structure 302, the light guide structure 306 includes a light guide shell 310 made of a light-transmitting material and having a receiving cavity 3063, a filling liquid 303 filling the receiving cavity 3063, and scattering particles 304 arranged in the filling liquid 303, the light guide shell 310 is made of a flexible or elastic material at a position facing the light source structure 302 and is provided with a light incident surface 3061, the light source structure 302 projects light toward the light incident surface 3061, that is, the light source structure 302 is located on one side of the light incident surface 3061 and projects light toward the light guide shell 310 through the light incident surface 3061, and a plurality of scattering particles 304 are provided, each of the scattering particles 304 is used to scatter the light in multiple directions so that the light is evenly distributed in the light guide structure 306.

[0028] See also Figures 2 to 4 , the light-guiding shell 310 can be made of a transparent material, such as organic glass, polycarbonate, polystyrene, etc. The filling liquid 303 can be a liquid with a high refractive index, such as an optical waveguide liquid, a polymer such as acrylic acid, silicone oil or an ionic liquid, etc. It can be understood that the filling liquid 303 fills the entire accommodating cavity 3063, and the filling liquid 303 is in a viscous fluid state. Since the filling liquid 303 has a relatively high specific heat capacity, the temperature rises slowly during operation, and the amount of expansion generated is relatively small. The scattering particles 304 can scatter the light toward multiple positions of the light-guiding structure 306, thereby improving the uniformity of the light distribution in the light-guiding shell 310.

[0029] It can be understood that the material of the light guide shell 310 at the light entrance surface 3061 can be chloroprene rubber, thermoplastic elastic material or thermoplastic polyurethane, so that the light guide shell 310 has the characteristics of flexibility, elasticity and light transmittance, so that the light output surface 3062 of the light source structure 302 can be arranged close to the light entrance surface 3061, so that light can enter the light guide shell 310 as much as possible, thereby improving the utilization rate of light, and even if the light guide shell 310 expands due to heat, due to the elasticity and flexibility of the light guide shell 310 at the light entrance surface 3061, it will not cause extrusion damage to the light source, thereby improving the safety and reliability of the light source structure 302.

[0030] See also Figures 2 to 4The backlight module 300 provided in this embodiment includes a light guide structure 306 and a light source structure 302. The light guide structure 306 includes a light guide shell 310 and a filling liquid 303 filled in the light guide shell 310. A plurality of scattering particles 304 are distributed in the filling liquid 303, so that the light incident on the light guide shell 310 can be scattered. The viscous filling liquid 303 reduces the expansion coefficient of the light guide structure 306, which can effectively reduce the thermal expansion of the light guide structure 306, which is conducive to manufacturing a liquid crystal display screen with a narrow frame. Moreover, the light guide shell 310 at the light incident surface 3061 is made of a flexible or elastic material, so that the light source structure 302 can be set close to the light incident surface 3061, thereby improving the utilization rate of light.

[0031] Optionally, the light guide housing 310 is entirely made of elastic or flexible material.

[0032] Optionally, the material of the light guide housing 310 can be any material that allows light to pass through. The material can be, for example, a thermoplastic resin such as polycarbonate resin, polyarylate resin, polyethylene terephthalate resin, polyamide resin, polystyrene resin, polymethacryloyl styrene resin, polyacrylonitrile-styrene resin, polymethyl methacrylate resin, polymethylpentene resin, cyclic olefin resin, polyphenylene sulfide sulfone resin, polysulfone resin, polyether sulfone resin, polyamide-imide resin, or polyphenylene ether imide resin. In addition, the material of the light guide housing 310 can also be a thermosetting resin such as epoxy resin, polyurethane resin, silicone resin, or polyimide resin. In addition, it can also be a photopolymerizable resin such as urethane acrylate resin, epoxy acrylate resin, acrylate resin, polyester acrylate resin, alicyclic epoxy resin, or glycidyl epoxy resin.

[0033] See also Figures 2 to 4 It can also be understood that the light guide shell 310 can also be made of flexible and transparent materials, and the light guide shell 310 has a certain hardness, so as to support and maintain the shape of the accommodating cavity 3063, avoid collapse, and make the light guide structure 306 form a flexible composite light guide structure 306.

[0034] See also Figures 2 to 4 Optionally, the filling liquid 303 can be an ionic liquid or an ionic gel. Ionic liquid: An ionic liquid is a special ionic fluid, which is a liquid composed of cations and anions. Ionic gel: An ionic gel is a material composed of a hydrogel containing ions. It has strong water adsorption and ion exchange properties.

[0035] See also Figures 2 to 4In order to achieve a better scattering effect, the backlight module 300 adds scattering particles 304 to the filling liquid 303. The scattering particles 304 can produce reflection and / or refraction of light. The scattering particles 304 can be inorganic particles such as zinc oxide, aluminum oxide, titanium oxide, zirconium oxide, silicon oxide, cerium oxide, etc. as inorganic oxides. In addition, the scattering particles 304 can also be organic particles such as acrylic resin, polystyrene resin, melamine resin, polyamide resin, etc. In addition, the scattering particles 304 can also be inorganic-organic particles such as silicone-acrylic composite particles. The size and concentration of the scattering particles 304 can be adjusted as needed to obtain the best scattering effect, which is not required here and can be selected according to actual conditions.

[0036] See also Figures 2 to 4 In some embodiments, the scattering particles 304 are spherical, and at least two of the scattering particles 304 have different diameters. Thus, another scattering particle 304 with a different diameter can be disposed between any two adjacent scattering particles 304 with the same diameter, so that light can be fully scattered to prevent light from passing through between the two scattering particles 304 without being scattered by one of the scattering particles 304.

[0037] Optionally, in this embodiment, there are four scattering particles 304 with different diameters, so that the light projected into the filling liquid 303 can be fully scattered.

[0038] See also Figures 2 to 4 In some embodiments, the light-guiding shell 310 has a light-emitting surface 3062 for the light to emit from the light-guiding structure 306. The light-emitting surface 3062 is provided with a microstructure, and the microstructure is used to increase the brightness of the light emitted from the light-emitting surface 3062, thereby avoiding the need to provide a diffusion plate at the light-emitting surface 3062, which not only reduces the cost but also reduces the thickness of the light-guiding structure 306.

[0039] See also Figures 2 to 4 In some embodiments, the microstructure includes a plurality of diffusion strips 307 protruding from the light exit surface 3062, each of the diffusion strips 307 is arranged in sequence and spaced apart, and a diffusion groove 308 is provided between any two adjacent diffusion strips 307. It can be understood that the diffusion strip 307 is in the shape of a long strip, and its two ends extend to the two opposite plate edges of the light guide housing 310 respectively, and the diffusion strip 307 can concentrate the light and project it in at least two directions, thereby improving the brightness at the light exit surface 3062.

[0040] In some embodiments, the cross-sectional shape of the diffusion strip 307 includes at least one of a semicircle, a polygon or a semi-ellipse. It is understood that the diffusion strip is in the shape of a long strip, and the cross-sectional shape obtained along the section perpendicular to its length direction can be a semicircle, a polygon or a semi-ellipse.

[0041] See also Figures 2 to 4 In this embodiment, the cross-sectional shape of the diffusion strip 307 is a triangle, and the triangle is an isosceles triangle, and the base of the triangle is located at the light emitting surface 3062. In other embodiments, the cross-sectional shape of the diffusion strip 307 can be selected according to actual conditions and is not limited here.

[0042] See also Figures 2 to 4 In some embodiments, the light guide shell 310 further has a bottom surface 3064 disposed opposite to the light emitting surface 3062, and the backlight module 300 further includes a reflective layer disposed on the bottom surface 3064, the reflective layer is an oil film layer, and reflective particles are disposed in the reflective layer, and a plurality of reflective particles are arranged at intervals on the bottom surface 3064, and each reflective particle can reflect the light back to the light guide shell 310 to prevent the light from being emitted from the reflective layer.

[0043] See also Figures 2 to 4 In some embodiments, the light source structure 302 includes a lamp board 3021 disposed relative to the light incident surface 3061 and lamp beads 3022 arranged on the lamp board 3021 and used to project the light toward the light incident surface 3061 .

[0044] Optionally, the lamp bead 3022 is an LED lamp bead, the lamp board 3021 is a circuit board, the LED lamp bead is arranged on the circuit board, and one side of the circuit board is parallel to the light incident surface 3061, and the lamp bead 3022 is located between the lamp board 3021 and the light incident surface 3061.

[0045] LED lamp beads have the following characteristics:

[0046] High efficiency and energy saving: Compared with the traditional light source structure, LED lamp beads have higher luminous efficiency and can convert electrical energy into more light energy. Therefore, LED lamp beads with the same brightness have lower power consumption and can save energy.

[0047] Long life: LED lamp beads have a long life, generally up to tens of thousands of hours, or even more than 100,000 hours, which is much longer than traditional light source structures. This also reduces the frequency and cost of replacing bulbs.

[0048] Space saving: LED lamp beads are relatively small and can be integrated into lamps of various shapes, making the design more flexible and easier to install.

[0049] Light, thin and compact: LED lamp beads themselves are very small and thin, so more sophisticated lamps and light strips can be manufactured, suitable for various occasions.

[0050] Optionally, a plurality of lamp beads 3022 are arranged at intervals on the lamp board 3021 , and the plurality of lamp beads 3022 are arranged linearly, and the length direction of the light guide housing 310 is set parallel to the length direction of the light board 3021 , so that light can be concentratedly emitted from the light guide housing 310 .

[0051] See also Figures 2 to 4 In some embodiments, the light-emitting surface of the lamp bead 3022 abuts against the light-incident surface 3061. Since the thermal expansion of the light-guiding structure 306 is extremely small, the light-emitting surface of the lamp bead 3022 can be directly abutted against the light-incident surface 3061, thereby avoiding light loss and improving light utilization.

[0052] See also Figures 2 to 4 In some embodiments, the backlight module 300 further includes a back panel 301 having a placement cavity 3011 , and the light guide structure 306 and the light source structure 302 are both disposed in the placement cavity 3011 , so that the back panel 301 provides protection for the light guide structure 306 and the light source structure 302 .

[0053] See also Figure 1 The present invention further proposes a liquid crystal display 100, which includes a backlight module 300. The specific structure of the backlight module 300 refers to the above embodiment. Since the present invention adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0054] In some embodiments, the liquid crystal display 100 further includes a liquid crystal module 200 . The liquid crystal module 200 is disposed relative to the backlight module 300 , and the liquid crystal module 200 can directly abut against the light guide structure 306 , or maintain a certain distance from the light guide structure 306 .

[0055] The liquid crystal module 200 includes a liquid crystal panel 201 disposed opposite to a light guide structure 306 , and the backlight module 300 also includes a face frame 202 for fixing the liquid crystal panel 201 and connecting the back plate 301 .

[0056] See also Figures 2 to 4 The light-guiding structure 306 used in the present invention includes a light-guiding shell 310 filled with a filling liquid 303 with a high viscosity. The light-guiding structure 306 as a whole can be soft in texture and have a small expansion coefficient to achieve a high-end effect of a narrow frame of the liquid crystal display 100. At the same time, the light-emitting surface of the lamp bead 3022 can directly abut against the light-receiving surface 3061 to avoid waste of light and improve light efficiency.

[0057] See also Figures 2 to 4, the light guide structure 306 can avoid being provided with a reflective sheet and various optical films, making the entire liquid crystal display 100 lighter and thinner. Scattering particles 304 are arranged in the filling liquid 303, which has a good light diffusion effect, and the light output surface 3062 of the light guide shell 310 is provided with a microstructure, and the bottom surface 3064 is coated with a reflective layer, which is compatible with the functions of the reflective sheet and the optical film.

[0058] Since only the light-guiding structure 306 is required as an optical component, the assembly of the LCD 100 is simpler, and the cost and the risk of foreign matter in assembly are greatly reduced. At the same time, material cost and labor cost can be saved, and the high-end effect of the LCD 100 with narrow frame and light weight is achieved.

[0059] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A backlight module, characterized in that: include: A light guide structure and a light source structure, wherein the light guide structure comprises a light guide shell made of a light-transmitting material and having a receiving cavity, a filling liquid filling the receiving cavity, and scattering particles placed in the filling liquid; the light source structure is located on one side of the light guide shell; the light guide shell is made of a flexible or elastic material and is provided with a light incident surface at a position facing the light source structure; the light output surface of the light source structure is arranged adjacent to the light incident surface; the light source structure projects light toward the light incident surface; a plurality of scattering particles are provided, each of the scattering particles being used to scatter the light in multiple directions so that the light is evenly distributed in the light guide shell; the scattering particles are spherical, and at least two of the scattering particles have different diameters; and since the filling liquid has a relatively high specific heat capacity, the expansion coefficient of the light guide structure is reduced, so as to effectively reduce the thermal expansion of the light guide structure.

2. The backlight module according to claim 1, wherein: The light guide housing has a light emitting surface for the light to emit from the light guide housing. The light emitting surface is provided with a microstructure, and the microstructure is used to improve the brightness of the light emitted from the light emitting surface.

3. The backlight module according to claim 2, wherein: The microstructure includes a plurality of diffusion strips protruding from the light emitting surface, and the diffusion strips are sequentially arranged at intervals.

4. The backlight module according to claim 3, wherein: The cross-sectional shape of the diffusion strip includes at least one of a semicircular shape, a polygonal shape, or a semi-elliptical shape.

5. The backlight module according to any one of claims 2 to 4, characterized in that: The light guide housing further comprises a bottom surface arranged opposite to the light emitting surface, and the light guide structure further comprises a reflective layer arranged on the bottom surface.

6. The backlight module according to any one of claims 1 to 4, characterized in that: The light source structure includes a lamp board arranged relative to the light incident surface and lamp beads placed on the lamp board and used for projecting the light toward the light incident surface.

7. The backlight module according to claim 6, wherein: The light emitting surface of the lamp bead abuts against the light incident surface.

8. The backlight module according to any one of claims 1 to 4, characterized in that: The backlight module also includes a back plate with a placement cavity, and the light guide structure and the light source structure are both arranged in the placement cavity.

9. A liquid crystal display, characterized in that: Comprising the backlight module as described in any one of claims 1 to 8, the liquid crystal display further comprises a liquid crystal module, and the liquid crystal module is arranged relative to the backlight module.

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