Light guide plate, backlight module and display device

Abstract

The utility model discloses a light guide plate, a backlight module and a display device, the body part of the light guide plate is provided with a light incident surface, a plurality of lenses are arranged in the body part, the incident surfaces of the lenses face the light incident surface, and the lenses are convex lenses or concave lenses. By optimizing the structural design of the light guide plate, the propagation path of light can be effectively changed, the light can be reguided and utilized, the brightness loss is greatly reduced, meanwhile, the uniformity of the light can be improved, and the display quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid crystal technical field especially relates to light guide plate, backlight module and display device. BACKGROUND

[0002] Light guide plate (Light Guide Plate, LGP) is a kind of high-tech product that linear light source is changed into area light source, mainly applied to the backlight source of liquid crystal display, with the advantages of ultra-thin, super-bright, light-guiding uniform, energy saving, environmental protection, no dark area, durable, not easy to yellowing and installation and maintenance simple and fast etc.

[0003] Its structure is generally as shown in Figure 1 When using, light-emitting component (for example, LB series bar light source etc.) will emit light to the light-in surface of light guide plate, in light guide plate, in the process that linear light source is changed into area light source, only the light hitting the dot on upper surface or lower surface can be refracted or reflected out of upper surface and be utilized, most of parallel light mainly parallel to upper and lower surfaces is directly guided out of light guide plate from light-out side, only a small part is reflected back by frame (i.e. Figure 1 Frame) and utilized, and this part of light also causes different degrees of light leakage or bright line on light-out side and other bad taste.And as shown in Figure 2 On the light-emitting surface of light-emitting component, middle parallel light intensity is strongest, in the design of current light guide plate, this part of light is parallel to the bottom surface of light guide plate and is directly transmitted to light-out side, thereby being lost.

[0004] In prior art, in order to solve the above problems, generally wave-shaped microstructure (V-cut structure) is designed on the light-in side of light guide plate, the V-cut structure can destroy parallel light, but in this way, light is too concentrated on light-in side, leading to serious light loss.In addition, the size of light guide plate can be increased, but material selection is limited, leading to unable to use on a large scale and economically;In addition, black frame can be used to absorb part of light, but this will cause loss of brightness. UTILITY MODEL CONTENTS

[0005] Therefore, the main purpose of the utility model is to provide a kind of light guide plate.

[0006] To achieve the above purpose, the technical scheme of the utility model is as follows: a kind of light guide plate, the body part of the light guide plate is provided with light-in surface, a plurality of lenses are provided in the body part, and the incidence surface of the lens is directed to the light-in surface.

[0007] As a kind of improvement of the embodiment of the utility model, the body part further includes: bottom surface, and light-out surface parallel to the bottom surface;The light-in surface is vertically connected to the bottom surface and light-out surface;Dot is provided on the bottom surface.

[0008] As an improvement to this embodiment of the present invention, the convex lens is of the type of biconvex, plano-convex, or concave-convex.

[0009] As an improvement of this utility model embodiment, the refractive index of the convex lens is less than the refractive index of the light guide plate.

[0010] As an improvement to this utility model embodiment, the concave lens is of the type of biconcave, plano-concave, or convex-concave.

[0011] As an improvement to this embodiment of the present invention, the refractive index of the concave lens is greater than the refractive index of the light guide plate.

[0012] As an improvement of this utility model embodiment, the lens closer to the light-incident surface has a smaller curvature, and the lens farther from the light-incident surface has a larger curvature.

[0013] A backlight module includes a reflector and the aforementioned light guide plate.

[0014] A display device comprising the aforementioned backlight module.

[0015] The light guide plate provided in this embodiment of the invention has the following advantages: This invention discloses a light guide plate, wherein the main body of the light guide plate is provided with a light incident surface, and a plurality of lenses are disposed in the main body, with the incident surface of the lenses facing the light incident surface, wherein the lenses are convex lenses or concave lenses. By optimizing the structural design of the light guide plate, the propagation path of light can be effectively changed, allowing it to be redirected and utilized, greatly reducing brightness loss, and improving light uniformity, thereby enhancing display quality. Attached Figure Description

[0016] Figure 1 This is a structural diagram of a light guide plate in the prior art;

[0017] Figure 2 A schematic diagram illustrating the luminous intensity of the light-emitting component;

[0018] Figure 3 This is a structural diagram of the light guide plate in one embodiment of the present invention;

[0019] Figure 4 This is a structural diagram of the light guide plate in another embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram showing the luminous intensity of a light-emitting component at different angles;

[0021] Figure 6 This is a schematic diagram showing the luminous intensity of another light-emitting component at different angles;

[0022] Figure 7 ,Figure 9 and Figure 11 This is a schematic diagram of the propagation of different light paths in a light guide plate of existing technology;

[0023] Figure 8 , Figure 10 ,and Figure 12 This is a schematic diagram of the propagation of different light paths in the light guide plate in the embodiments of this utility model;

[0024] Figures 13a-13d This is a production flow diagram of the light guide plate in one embodiment of the present invention;

[0025] Figures 14a-14d This is a production flow diagram of the light guide plate in another embodiment of the present invention. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0027] The following description and accompanying drawings fully illustrate specific embodiments described herein to enable those skilled in the art to practice them. Some embodiments may include or substitute parts and features of other embodiments. The scope of the embodiments herein encompasses the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0028] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing the document and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0029] Figure 3 This is a structural diagram of the light guide plate in one embodiment of the present invention. Figure 4 This is a structural diagram of the light guide plate in another embodiment of the present invention, as shown below. Figure 3 and Figure 4 As shown, this utility model embodiment provides a light guide plate. The main body of the light guide plate is provided with a light incident surface 3, and a plurality of lenses 4 are provided in the main body. The incident surface of the lenses 4 faces the light incident surface 3.

[0030] Here, the light guide plate can be made of highly transparent optical materials, such as: 1. PMMA (Polymethyl Methacrylate), which has advantages such as high transparency, good weather resistance, and excellent processing performance; 2. PC (Polycarbonate), which has advantages such as strong impact resistance and high temperature resistance; 3. MS (Methyl Methacrylate-Styrene Copolymer), which has advantages such as high transparency and good impact resistance.

[0031] The core function of a light guide plate is to convert a point light source or line light source into a uniform surface light source. Its working principle is based on the effects of total internal reflection and scattering of light. The incident light source (i.e.,...) is located at the light-incident surface of the light guide plate. Figure 3 and Figure 4 The light-emitting component in the light source emits light that enters the light guide plate at a certain angle (e.g., in the light-emitting component). Figure 3 and Figure 4 In the scenario shown, the angle between the light ray and the ground plane is -60° to 60°. In this light guide plate, one side can be set as the light incident surface 3, or both opposite sides can be set as the light incident surface 3. The light source can be LED (Light-Emitting Diode), etc.

[0032] The light guide plate is made of a highly transparent material (such as PMMA, PC, etc.), with a refractive index higher than that of air. When some light propagates from inside the light guide plate to the surface in contact with air, the angle of incidence is greater than the critical angle, and total internal reflection occurs. Through total internal reflection, the light propagates continuously inside the light guide plate without escaping from the surface. A portion of this light can enter lens 4 from the incident surface; another portion of the light is parallel to the bottom surface and can also enter lens 4 from the incident surface. Without lens 4, both portions of the light would eventually hit the frame. In the light guide plate of this embodiment, because lens 4 can focus or diverge light, i.e., the light undergoes one or more refractions, some of the light is disrupted in its path, such as... Figure 3 and Figure 4 As shown, some light rays can be incident on the light-emitting surface 2, and the angle of incidence is less than the critical angle, thus emitting from the light-emitting surface 2. This greatly reduces light loss.

[0033] Here, these lenses 4 can be evenly distributed in the main body, or the distribution of the lenses 4 can be adjusted according to the actual situation. For example, the closer to the light-incident surface 3, the denser the distribution of the lenses 4, and the farther away from the light-incident surface 3, the sparser the distribution of the lenses 4.

[0034] In this embodiment, the main body further includes: a bottom surface 1 and a light-emitting surface 2 parallel to the bottom surface 1; the light-incident surface 3 is perpendicularly connected to the bottom surface 1 and the light-emitting surface 2; and halftone dots 6 are provided on the bottom surface 1. Here, the halftone dots 6 on the bottom surface of the light guide plate mainly function as follows: 1. To uniformly distribute light, ensuring uniform distribution of light within the light guide plate through scattering and reflection, avoiding uneven brightness; 2. To control light output, adjusting the emission angle and direction of light to more effectively emit light from the surface of the light guide plate, improving display brightness and uniformity; 3. To improve light utilization, reducing light loss within the light guide plate and enhancing the luminous efficiency of the backlight module; 4. To optimize display effects, improving the visual effect of the display and reducing dark areas and bright spots through precise design of the size, density, and distribution of the halftone dots 6. In summary, the halftone dots 6 play a crucial role in improving the brightness and uniformity of the liquid crystal display.

[0035] In this embodiment, lens 4 is a convex lens. In a convex lens, parallel light rays, parallel to the principal axis (the line connecting the centers of the two spherical surfaces of the lens is called the principal axis), enter the lens. After being refracted twice on both sides of the lens, the light converges to a point on the axis; this point is called the focal point of the convex lens. A convex lens has a real focal point on each side. If it is a thin lens, the distances from these two focal points to the center of the lens are approximately equal. The convex lens can alter the light path.

[0036] In this embodiment, the convex lens is of the type biconvex, plano-convex, or concave-convex. Here, a biconvex lens has the shape of both surfaces convex outwards; its characteristics include a symmetrical design, a short focal length, and strong light-gathering ability. A plano-convex lens has the shape of one surface being flat and the other convex; its characteristics include an asymmetrical design, a longer focal length, and smaller aberrations when light is incident from the convex surface. A concave-convex lens has the shape of one surface being convex and the other concave; its characteristics include a greater curvature of the convex surface than the concave surface, while still having the function of converging light, a longer focal length, and smaller aberrations, and is often used in optical systems to correct aberrations.

[0037] Convex lenses are typically made of optical glass or optical plastics, specifically: 1. Optical glass, such as crown glass (e.g., BK7) and flint glass (e.g., SF11); 2. Optical plastics, such as polymethyl methacrylate (PMMA, commonly known as acrylic) and polycarbonate (PC).

[0038] In this embodiment, the refractive index of the convex lens is less than the refractive index of the light guide plate. Here, the function of the convex lens is to focus or diffuse light. When the refractive index of the convex lens is lower than that of the light guide plate, the light will undergo appropriate refraction when passing through the lens, helping the light to be distributed more evenly.

[0039] In this embodiment, lens 4 is a concave lens. A concave lens is thin in the middle and thick at the edges, and it has a diverging effect on incident light. After parallel incident light rays pass through the concave lens, the backward extensions of their diverging rays intersect at a point, which is the virtual focal point of the concave lens.

[0040] In this embodiment, the concave lens is of the type biconcave, plano-concave, or convex-concave. Here, a biconcave lens has the shape of both surfaces being concave inwards, characterized by a symmetrical design, the ability to diverge light, and a negative focal length. A plano-concave lens has the shape of one surface being flat and the other concave, characterized by an asymmetrical design, the ability to diverge light, and a negative focal length; it is commonly used in laser systems and optical instruments for beam divergence and aberration correction. A convex-concave lens has the shape of one surface being convex and the other concave, with the curvature of the concave surface being greater than that of the convex surface; it has the overall ability to diverge light, a negative focal length, and is commonly used in optical systems for aberration correction and beam path adjustment.

[0041] Concave lenses are typically made of optical glass or optical plastics, specifically: 1. Optical glass, such as crown glass (e.g., BK7) and flint glass (e.g., SF11); 2. Optical plastics, such as polymethyl methacrylate (PMMA, commonly known as acrylic) and polycarbonate (PC).

[0042] In this embodiment, the refractive index of the concave lens is greater than the refractive index of the light guide plate. Here, when the refractive index of the concave lens is greater than the refractive index of the light guide plate, light rays entering the light guide plate from the concave lens will be deflected in a direction away from the normal (the angle of refraction is greater than the angle of incidence), thereby enhancing the divergence effect of the light rays.

[0043] In this embodiment, since the light is weaker the farther away from the light-incident surface 3, the curvature of the lens 4 that is closer to the light-incident surface 3 is smaller, and the curvature of the lens 4 that is farther away from the light-incident surface 3 is larger, thereby making the light intensity at different positions more uniform.

[0044] Figure 5 This is a schematic diagram showing the luminous intensity of a light-emitting component at different angles. Figure 6 This diagram illustrates the luminous intensity of another light-emitting component at different angles. Most light sources have a specific emission angle, with the majority of energy concentrated within a preset angle. The smaller the angle, the higher the energy. For example, an LED has an emission angle of 120°, and its light distribution in various directions is as follows... Figure 5 and Figure 6 As shown in the LED viewing angle energy diagram, the main energy is concentrated within ±30 degrees, with higher energy levels at smaller angles. Figure 5 and Figure 6 The diagram shows the relationship curves between viewing angle and light intensity for different LEDs. This embodiment mainly changes the energy... Figure 5 Medium green area – Light utilization rate of the area with the strongest light.

[0045] Figure 7 , Figure 9 and Figure 11 This is a schematic diagram illustrating the propagation of different light paths in existing light guide plates. Figure 8 , Figure 10 ,and Figure 12 This is a schematic diagram illustrating the propagation of different light paths in the light guide plate of this utility model embodiment. For example... Figure 7 and Figure 8 As shown, taking PMMA (polymethyl methacrylate) as an example, its refractive index is 1.49 and its critical angle is 42°. Assume the dimension of the light guide plate along the LED direction is L and its thickness is h. According to the principles of geometric optics, the incident angle β can be calculated using the formula β = 2*arctan(h / 2 / L)°. For example, taking a 13-inch light guide plate with a thickness of 0.8mm and a width of 170mm, the calculated incident angle β ≈ 0.27°. Because this portion of the light has a small incident angle, it cannot propagate within the light guide plate through total internal reflection; therefore, it can only be utilized by changing the structural design of the optical path.

[0046] By optimizing the structural design of the light guide plate, such as adding microstructures (e.g., dots, prism structures) to the bottom or sides, the propagation path of light can be effectively altered, allowing it to be redirected and utilized. Based on theoretical calculations and experimental verification, this structural optimization is expected to increase the brightness of the light guide plate by over 30% (based on cross-sectional area ratio). This brightening effect not only improves the overall brightness of the display but also enhances light uniformity, thereby improving display quality.

[0047] like Figure 9 and Figure 10 As shown, if light hits 1 / 3L of the upper surface of the light guide plate (i.e., one-third of the length of the light guide plate from the light source), due to the large angle of incidence, this portion of the light will undergo total internal reflection on the upper surface and then be discharged from the side or bottom of the light guide plate. This propagation path of the light means it cannot be directly used for display, resulting in light loss. To fully utilize this portion of the light, its optical path needs to be altered through structural design so that it can re-enter the light guide plate and participate in the display.

[0048] Specifically, microstructures (such as dots, prism structures, or reflective films) can be added to the bottom or sides of the light guide plate. These structures can reflect or refract the originally guided light back into the light guide plate, thereby increasing the amount of usable light. According to theoretical calculations and experimental verification, this structural optimization is expected to achieve a brightness increase of approximately 10% (based on calculations of cross-sectional area ratio, as shown by the red dashed line area). Although the brightness increase is relatively small, this optimization is still of great significance in high-precision display applications.

[0049] Normally, light rays at 1 / 3L of the light guide plate undergo total internal reflection with the upper surface and are then emitted from the side or bottom of the light guide plate, making them unusable for direct display. However, by adding specific optical structures (i.e., lenses) to the surface or interior of the light guide plate, the propagation path of these rays can be effectively altered. Specifically, these structures enable light rays to refract or reflect before reaching the upper surface, thus triggering total internal reflection earlier.

[0050] This design allows light to interact with the dots on the lower surface of the light guide plate earlier. The dot structure, through multiple refractions and reflections, redirects light that might otherwise be lost back into the light guide plate, ensuring it is uniformly emitted from the light-emitting surface. This optimization not only improves light utilization but also significantly enhances the brightness and uniformity of the display.

[0051] like Figure 11 and Figure 12As shown, in existing light guide plates, light rays with angles greater than the critical angle typically undergo total internal reflection at the upper surface, thus propagating within the light guide plate. However, some light rays, after refraction at the lower surface, still have an angle greater than the critical angle with the upper surface. This portion of light would otherwise continue propagating within the light guide plate and cannot be directly used for display. This invention, by introducing a novel optical structure (i.e., a lens), effectively alters the propagation path of these light rays, enabling their reuse.

[0052] Specifically, the new structure redirects this portion of the light to the lower surface, allowing it to interact with the dots on that surface. The dots, through refraction and reflection, redirect light that might otherwise be lost back into the light guide plate, ensuring it is ultimately emitted uniformly from the light-emitting surface. This optimized design significantly improves light utilization, especially for light that was previously unusable directly.

[0053] The utilization rate of this portion of light is closely related to the area ratio of the dots on the lower surface. Experiments show that its utilization rate is approximately between 0% and 15%, with the specific value depending on the density and distribution of the dot structure. When the dots on the lower surface are relatively sparse, the opportunities for light to interact with the dots decrease, but the efficiency of each interaction is higher, thus the proportion of reuse is relatively large. Conversely, when the dot density is high, although the opportunities for interaction increase, the scattering and loss of light may also increase, resulting in a relatively low utilization rate.

[0054] By optimizing the distribution density and shape of the dot matrix structure, light utilization can be further improved while reducing the negative impact of light scattering. This design not only enhances the brightness and uniformity of the display but also reduces dark areas and bright spots at the edges, thereby improving the overall display effect. Therefore, this novel structure has significant application value in the field of liquid crystal displays.

[0055] Figures 13a-13d This is a production flow diagram of the light guide plate in one embodiment of the present invention, as shown below. Figures 13a-13d As shown, the manufacturing steps of a light guide plate with a convex lens may include:

[0056] Step 1: Mold preparation and sub-light guide plate configuration

[0057] First, prepare a specially made mold. The upper surface (surface B) and lower surface (surface A) of this mold are precisely and symmetrically arranged with several protrusions, such as... Figure 13a As shown. These protrusions are ingeniously designed; when the bottom surfaces of the protrusions on surfaces A and B are aligned with the top surfaces of the protrusions on the lower surface, a complete lens structure, namely a convex lens, is formed. Subsequently, two sub-light guide plates, LGP1 and LGP2, are prepared, which will serve as the basic structure of the light guide plate.

[0058] Step 2: Imprinting and molding the inner core of the light guide plate

[0059] Sub-light guide plates LGP1 and LGP2 are precisely placed directly above and below the mold, respectively. Then, these two sub-light guide plates are moved towards the mold, applying appropriate pressure so that the protrusions on the mold leave precise indentations on the sub-light guide plates, such as... Figure 13b As shown. This step requires extremely high alignment accuracy and pressure control to ensure that the shape and depth of the indentation meet design requirements.

[0060] Step 3: Injection of lens material and bonding of sub-light guide plate

[0061] Material for manufacturing lenses is injected into the recesses formed on sub-light guide plates LGP1 and LGP2. After curing, this material forms the upper and lower parts of the lens on each of the two sub-light guide plates. Subsequently, sub-light guide plates LGP1 and LGP2 are precisely aligned and bonded together, ensuring perfect correspondence between the upper and lower parts of the same lens, forming a complete lens structure, such as... Figure 13c As shown. This step requires precise material control and bonding techniques to ensure the optical performance of the lens and the overall stability of the light guide plate.

[0062] Step 4: Dot imprinting on the lower surface of the light guide plate

[0063] Finally, dot embossing is performed on the lower surface of the light guide plate, such as... Figure 13d As shown. This step optimizes the light guide plate's luminous effect by creating a series of tiny dots on its lower surface to control light scattering and distribution. The size, shape, and density of the dots need to be precisely designed according to the application requirements of the light guide plate to achieve the best visual effect.

[0064] Figures 14a-14d This is a production flow diagram of the light guide plate according to another embodiment of the present invention, such as... Figures 14a-14d As shown, the manufacturing steps of a light guide plate with a concave lens may include:

[0065] Step 1: Mold preparation and sub-light guide plate configuration

[0066] First, prepare two molds, mold A and mold B, as follows: Figure 14aAs shown, the lower surface of mold A and the upper surface of mold B are symmetrically equipped with several protrusions. These protrusions are precisely designed to correspond, meaning that each protrusion in mold A is completely symmetrical to one protrusion in mold B in the vertical direction. For any pair of vertically symmetrical protrusions, connecting the bottom surface of the protrusion in mold A with the top surface of the protrusion in mold B forms a complete concave lens structure. This design ensures the accuracy and consistency of the lens shape. Simultaneously, a sub-light guide plate LGP1 is prepared as the substrate for the light guide plate, used for subsequent imprinting and lens forming.

[0067] Step 2: Imprinting of the light guide plate

[0068] The prepared sub-light guide plate LGP1 is precisely placed between molds A and B, ensuring its centered position and alignment with the protruding structures of the molds. Then, mold A moves downwards and mold B moves upwards, applying pressure simultaneously to clamp the sub-light guide plate LGP1 in the middle. Under pressure, the protruding structures of molds A and B imprint corresponding indentations on the upper and lower surfaces of the sub-light guide plate LGP1, respectively. Figure 14b As shown. This step requires high-precision alignment and pressure control to ensure that the shape, depth, and position of the indentation fully meet the design requirements, laying the foundation for subsequent lens material injection.

[0069] Step 3: Injection and curing of lens material, and bonding of light guide plate.

[0070] In the recesses formed on the sub-light guide plate LGP1, material for manufacturing the lens is injected. This material is typically a transparent resin or optical adhesive with a high refractive index to ensure the lens's optical performance. After injection, the material is cured by heating or ultraviolet irradiation. The cured material forms the upper and lower parts of the concave lens on the upper and lower surfaces of the sub-light guide plate LGP1, respectively. Figure 14c As shown. The key to this step lies in the uniform injection of material and the control of the curing process to avoid bubbles or impurities affecting the optical quality of the lens.

[0071] Step 4: Dot imprinting on the lower surface of the light guide plate

[0072] Dot embossing is performed on the lower surface of the light guide plate, such as... Figure 14d This step involves creating a series of tiny dots on the lower surface of the light guide plate to control the scattering and distribution of light, thereby optimizing the uniformity and brightness of the light output. The size, shape, and density of the dots need to be precisely designed according to the specific application requirements of the light guide plate. For example, the dot density may be lower in areas closer to the light source and higher in areas farther away from the light source to achieve uniform light output.

[0073] This utility model also discloses a backlight module, which includes a reflector 5 and a light guide plate provided in the above embodiment. The reflector 5 is disposed on the bottom plate of the backlight module facing the light guide plate. Here, the reflector functions to: 1. Reflect light, reflecting light leaking from the bottom of the light guide plate back into the light guide plate, reducing light loss and improving light utilization; 2. Distribute light evenly, helping light to diffuse uniformly within the light guide plate, ensuring consistent display brightness; 3. Enhance brightness, increasing the overall brightness of the display by reflecting light; 4. Save energy, reducing light loss and lowering the energy consumption of the backlight module. In summary, the reflector 5 plays a crucial role in improving the brightness and uniformity of the liquid crystal display.

[0074] The reflector 5 is usually made of a high reflectivity material. Common materials include: 1. Polyester film (PET, Polyethylene Terephthalate), the surface of which is coated with a high reflectivity coating, such as silver or aluminum, which has good reflectivity and mechanical strength; 2. Polycarbonate (PC, Polycarbonate), which has high light transmittance and heat resistance and is often used in applications requiring high durability; 3. Metal foil, such as aluminum foil, which has extremely high reflectivity and is often used in applications requiring extremely high reflectivity; (4) Multilayer optical film, which enhances the reflection effect by using the principle of optical interference through multilayer film design.

[0075] This utility model also discloses a display device, which includes the backlight module provided above.

[0076] The backlight module and display device of this invention, which use the aforementioned light guide plate, have higher light utilization, greatly reduce brightness loss, and improve display quality.

[0077] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0078] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A light guide plate, characterized in that, The light guide plate has a light incident surface (3) in its main body and a plurality of lenses (4) in the main body. The incident surface of the lenses (4) faces the light incident surface (3). The lenses (4) are either convex or concave lenses.

2. The light guide plate according to claim 1, characterized in that: The main body also includes: a bottom surface (1) and a light-emitting surface (2) parallel to the bottom surface. The light-incident surface (3) is perpendicularly connected to the bottom surface (1) and the light-outceasing surface (2); Dots (6) are provided on the bottom surface (1).

3. The light guide plate according to claim 1, characterized in that: The convex lens can be biconvex, plano-convex, or concave-convex.

4. The light guide plate according to claim 3, characterized in that: The refractive index of the convex lens is less than the refractive index of the light guide plate.

5. The light guide plate according to claim 1, characterized in that: The concave lens is of the following types: biconcave, plano-concave, or convex-concave.

6. The light guide plate according to claim 5, characterized in that: The refractive index of the concave lens is greater than the refractive index of the light guide plate.

7. The light guide plate according to claim 1, characterized in that: The closer the lens (4) is to the light-incident surface (3), the smaller its curvature; the farther the lens (4) is from the light-incident surface (3), the larger its curvature.

8. A backlight module, characterized in that, Includes a reflector and a light guide plate as described in any one of claims 1-7.

9. A display device, characterized in that, Includes the backlight module as described in claim 8.

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