Backlight module and display

Abstract

The utility model relates to the technical field of electronic display, and provides a backlight module and a display. The backlight module comprises a lamp panel, a light guide plate and a rear reflective film. Specifically, light-emitting sources are arranged at the two ends of the lamp panel; the light guide plate is arranged on one side of the lamp panel and provided with a plurality of light guide parts, and the distance between every two adjacent light guide parts is gradually reduced from the two ends of the light guide plate to the middle of the light guide plate. The rear reflective film is arranged between the lamp panel and the light guide plate and used for reflecting part of light which is not directly captured by the light guide plate to the light guide plate. According to the backlight module and the display, the defect that the backlight module in the prior art is bright at two ends and dark in the middle is overcome, and the backlight module and the display with more uniform light emission are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic display technical field especially relates to a backlight unit and display. BACKGROUND

[0002] The backlight unit is a key component in the liquid crystal display, which provides necessary light source for the non-luminous liquid crystal panel, so that the image and text can be clearly displayed. The quality of the backlight unit directly affects the important performance indicators such as brightness, contrast, color performance of the display.

[0003] The light source of the existing backlight unit is located at both ends of the lamp plate, and the light guide plate is relatively long, so there is a situation of bright at both ends and dark in the middle when using. UTILITY MODEL CONTENT

[0004] The utility model provides a backlight unit and display to solve the defect that the backlight unit in prior art exists bright at both ends and dark in the middle, realize a kind of more uniform backlight unit and display of emitting light.

[0005] The utility model provides a kind of backlight unit comprising:

[0006] Lamp plate, both ends are equipped with light source;

[0007] Light guide plate, it is located in one side of the lamp plate, the light guide plate is equipped with multiple light guide parts, the interval of adjacent two light guide parts gradually reduces from both ends of the light guide plate to the middle of the light guide plate;

[0008] Rear light reflecting film, it is located between the lamp plate and the light guide plate, for the light reflected to the light guide plate by the light guide plate not being directly captured.

[0009] According to the utility model provides a kind of backlight unit, the interval of adjacent two light guide parts is 0.5mm-2mm, the reduction range of the interval is 0.02mm.

[0010] According to the utility model provides a kind of backlight unit, the diameter of the light guide part located at both ends of the light guide plate is greater than the diameter of the light guide part located at the middle of the light guide plate.

[0011] According to the utility model provides a kind of backlight unit, the side of the light guide plate away from the rear light reflecting film is equipped with front diffusion film, and the front diffusion film is used for the uniformization of the light.

[0012] According to the utility model provides a kind of backlight unit, the side of the front diffusion film away from the light guide plate is equipped with front light reflecting film.

[0013] The utility model provides a kind of backlight module, the top of the light guide plate is equipped with upper light reflection film, one side of the upper light reflection film is in abutment with the lamp plate, and the other side is in abutment with the front light reflection film.

[0014] The utility model provides a kind of backlight module, the bottom of the light guide plate is equipped with lower light reflection film, one side of the lower light reflection film is in abutment with the lamp plate, and the other side is in abutment with the front light reflection film.

[0015] The utility model provides a kind of backlight module, the reflection surface of the upper light reflection film, the rear light reflection film, the lower light reflection film and the front light reflection film are all towards the light guide plate setting.

[0016] The utility model provides a kind of backlight module, the connecting mode between the lamp plate and the rear light reflection film, the rear light reflection film and the light guide plate, the light guide plate and the front diffusion film, the front diffusion film and the front light reflection film, the upper light reflection film and the light guide plate and the lower light reflection film and the light guide plate are all adhesive.

[0017] The utility model also provides a kind of display, comprising:

[0018] Front frame has power lamp window;

[0019] Fixed plate, is located in the side of the front frame;

[0020] Display screen module, is located in the other side of the front frame;

[0021] As the backlight module described in any one of the above embodiments, it is located between the fixed plate and the front frame, and is located in the power lamp window.

[0022] The utility model provides a kind of backlight module, because the spacing between the light guide part of the area (i.e. the two ends of light guide plate) close to light source is larger, to allow more light to directly penetrate and propagate along the surface of light guide plate. As light propagates to the middle part of light guide plate, the spacing between light guide part gradually reduces, which makes light more easily captured by light guide part, and dispersed to other parts of light guide plate, especially the middle region, through multiple reflection and refraction. This gradually changing light guide part layout effectively guides light to concentrate from both ends to the middle, thereby compensating for the problem of insufficient brightness in the middle.

[0023] The utility model also provides a kind of display, since the display includes the above-mentioned backlight module, thus also has the beneficial effects of the above-mentioned backlight module. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0025] Figure 1 The structure diagram of the backlight module provided by the present application is shown.

[0026] Figure 2 The structure diagram of the light guide plate of the backlight module provided by the present application is shown.

[0027] Figure 3 The structure diagram of the display provided by the present application is shown.

[0028] Reference signs: 100: backlight module; 110: lamp plate; 120: upper light reflection film; 130: rear light reflection film; 140: light guide plate; 141: light guide part; 150: front diffusion film; 160: lower light reflection film; 170: front light reflection film; 200: fixing plate; 300: front frame; 400: display screen module. DETAILED DESCRIPTION

[0029] The embodiments of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0030] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature can be "under", "below" and "underneath" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0034] The structure and working principle of the present application will be described below. Figures 1-3

[0035] Referring to Figure 1 The backlight module 100 provided by the present application comprises a lamp plate 110, a rear light reflection film 130 and a light guide plate 140. The lamp plate 110 is provided with light sources at both ends. The light guide plate 140 is arranged on one side of the lamp plate 110, and the light guide plate 140 is provided with a plurality of light guide portions 141. It should be noted that the light guide portion 141 is a groove arranged on the surface of the light guide plate 140, which can be arc-shaped, and can be a circular groove, which does not penetrate the light guide plate 140. The interval between the adjacent two light guide portions 141 gradually decreases from the two ends of the light guide plate 140 to the middle of the light guide plate 140. The rear light reflection film 130 is arranged between the lamp plate 110 and the light guide plate 140, and is used to reflect part of the light not directly captured by the light guide plate 140 to the light guide plate 140.

[0036] ​In the utility model, the both ends of the lamp panel 110 are provided with light sources, the light emitted by the light sources firstly enters the back reflecting film 130 between the lamp panel 110 and the light guide plate 140. Subsequently, the light passes through the back reflecting film 130 and enters the light guide plate 140. The light guide plate 140 is provided with a plurality of light guide portions 141, the interval of the light guide portions 141 gradually decreases from the both ends to the middle of the light guide plate 140, which can optimize the propagation path of the light in the light guide plate 140 and ensure that the light can be more evenly distributed on the whole light guide plate 140.

[0037] Specifically, since the interval between the light guide portions 141 of the area close to the light source (i.e. the both ends of the light guide plate 140) is larger, more light can directly penetrate and propagate along the surface of the light guide plate 140. As the light propagates to the middle of the light guide plate 140, the interval between the light guide portions 141 gradually decreases, which makes the light more easily captured by the light guide portions 141 and dispersed to other parts of the light guide plate 140, especially the middle area, through multiple reflections and refractions. This gradually changing layout of the light guide portions 141 effectively guides the light to concentrate from the both ends to the middle, thereby compensating for the problem of insufficient brightness in the middle.

[0038] The back reflecting film 130 is arranged between the lamp panel 110 and the light guide plate 140, which mainly reflects the light not directly captured by the light guide plate 140 back into the light guide plate 140. When the light fails to effectively enter the light guide plate 140 for the first time, the back reflecting film 130 reflects it back, increasing the chance of the light entering the light guide plate 140 again and participating in the light distribution process of the light guide portions 141. In this way, even the light that is not fully utilized in the initial propagation process can play a role in subsequent reflection and re-propagation, reducing the light loss of the light source, thereby ensuring that the overall brightness of the utility model will not decrease.

[0039] In some possible embodiments, in order to ensure the direction and efficiency of light conduction in the backlight module 100 and solve the problem of "bright at both ends and dark in the middle", when designing the backlight module 100, appropriate materials should be selected according to the functions of each component. Specifically:

[0040] When designing the lamp panel 110, a material with good electrical conductivity and heat dissipation should be selected to ensure the stable operation of the light source. The light source can be a high-brightness LED, which can provide sufficient light source intensity and has lower energy consumption and longer service life.

[0041] In order to enable the light emitted from the light source to effectively enter the light guide plate 140, when designing the back reflecting film 130, a material with high reflectivity should be selected, such as polyethylene terephthalate or aluminum plating material. This material can maximize the reflection of the light not directly utilized, improve the utilization rate of light, and ensure that more light can participate in the light distribution process in the light guide plate 140.

[0042] In the design of the light guide plate 140, a material with high transparency and excellent optical performance, such as acrylic or polycarbonate, should be selected. Moreover, the distance between two adjacent light guide portions 141 gradually decreases from the two ends to the middle of the light guide plate 140. Such a design can optimize the propagation path of light inside the light guide plate 140, so that the light can be more evenly distributed inside the light guide plate 140, thereby compensating for the problem of insufficient brightness in the middle.

[0043] In some possible embodiments, in the design of the light guide plate 140, the distance between two adjacent light guide portions 141 can be set to be between 0.5 mm and 2 mm, and gradually decreases from the two ends to the middle of the light guide plate 140, and the decrease in distance can be set to be 0.02 mm per step. This design can optimize the propagation path of light inside the light guide plate 140, and ensure that the light can be more evenly distributed on the light guide plate 140.

[0044] By precisely controlling the distance between the light guide portions 141 and the decrease in distance, the optimization of light distribution can be achieved without affecting the overall light effect. Such a design not only solves the problem of uneven brightness in the conventional backlight module 100, but also improves the display quality, and ensures the consistency of screen brightness and visual comfort.

[0045] In some embodiments of the present application, in order to improve the problem of "bright at both ends and dark in the middle" in the existing backlight module 100, different diameters of the light guide portions 141 can be provided in the design of the light guide plate 140, wherein the diameter of the light guide portion 141 located at the two ends of the light guide plate 140 is greater than the diameter of the light guide portion 141 located in the middle of the light guide plate 140. In addition, the diameter of the light guide portion 141 can also be gradually increased from the middle to the two ends of the light guide plate 140.

[0046] Specifically, when the light emitted by the light source enters the light guide plate 140, more light can be effectively captured and dispersed at the position close to the light source due to the larger diameter of the light guide portions 141 at the two ends. As the light propagates to the middle of the light guide plate 140, the diameter of the light guide portion 141 gradually decreases, which helps to control the propagation direction and intensity of the light, so that the light is more easily concentrated in the middle region and dispersed to the entire light guide plate 140 through multiple reflections and refractions. Such a gradually changing diameter design of the light guide portion 141 not only promotes the effective transfer of light from the two ends to the middle, but also enhances the brightness of the middle region, solving the problem of uneven brightness in the conventional design.

[0047] Meanwhile, by setting the diameter of the light guide portion 141 appropriately, the light distribution can be optimized without affecting the overall light effect. The larger light guide portion 141 can effectively capture more light at both ends, and the gradually decreasing diameter of the light guide portion 141 can guide the light to be distributed more evenly on the light guide plate 140. Such a design not only improves light utilization, but also ensures the consistency of screen brightness and visual comfort.

[0048] With reference to Figure 1 In some embodiments of the present application, the light guide plate 140 is provided with a front diffusion film 150 on the side away from the rear reflective film 130, and the front diffusion film 150 is used to homogenize the light.

[0049] Specifically, when the front diffusion film 150 receives light from the light guide plate 140, it can effectively diffuse the light, ensuring that the light is more evenly distributed on the screen after passing through the front diffusion film 150. This not only compensates for any deficiencies in the light distribution within the light guide plate 140, but also serves as the last line of defense to ensure that the user sees a screen with consistent brightness and no significant differences. Even if the design of the light guide plate 140 fails to completely eliminate brightness differences, the front diffusion film 150 can ensure that the light ultimately presented to the user is the most uniform.

[0050] It should be noted that in order to ensure that the front diffusion film 150 can effectively homogenize the light in the backlight module 100, when designing the front diffusion film 150, a material with excellent optical properties and appropriate scattering characteristics should be selected. The main function of the front diffusion film 150 is to further homogenize the light after being processed by the light guide plate 140, reduce possible hot spots or dark areas, and make the final output light more uniform and soft. Therefore, in order to achieve this goal, when selecting the material of the front diffusion film 150, the transparency, scattering ability and processing performance of the material should be considered.

[0051] Specifically, in order to ensure high brightness uniformity and good optical performance, PET (polyethylene terephthalate) can be selected as the base material when designing the front diffusion film 150. PET has good mechanical strength, chemical resistance and processing performance, and by appropriate surface treatment or adding optical particles, it can effectively scatter light and provide ideal diffusion effect. In addition, in order to enhance the optical properties of the front diffusion film 150, polycarbonate (PC) can also be used, which has high transparency and impact strength, and is suitable for application scenarios that require high durability and good optical performance. PC can be provided with microstructure or coating to enhance the diffusion properties of light, thereby meeting higher optical requirements.

[0052] In addition, in order to further optimize the scattering effect without significantly reducing the light transmittance, when designing the front diffusion film 150, Acrylic can be considered. The Acrylic material has high transparency, is easy to mold, and the scattering degree of light can be controlled by adjusting the optical particle concentration in the formula. This makes it an ideal choice for making high-performance diffusion films. At the same time, in order to achieve specific optical performance, in some cases, a film containing scattering particles can be designed, which can be embedded or coated in a transparent substrate to increase the scattering of light and improve the uniformity of light.

[0053] In some specific embodiments, the front diffusion film 150 has a light transmittance of 80%, a yellowness index of 2.2%, and a haze of 102%. With such settings, the diffusion effect of the front diffusion film 150 on light can be further ensured, making the light emitted by the light reflection film group more uniform, and further reducing the light emitted by the lamp panel 110 module more uniform.

[0054] Referring to Figure 1 In some embodiments of the present application, the front diffusion film 150 is provided with a front light reflection film 170 away from the light guide plate 140. The top of the light guide plate 140 is provided with an upper light reflection film 120, one side of the upper light reflection film 120 abuts against the lamp panel 110, and the other side abuts against the front light reflection film 170. The bottom of the light guide plate 140 is provided with a lower light reflection film 160, one side of the lower light reflection film 160 abuts against the lamp panel 110, and the other side abuts against the front light reflection film 170. And the reflection surfaces of the upper light reflection film 120, the rear light reflection film 130, the lower light reflection film 160 and the front light reflection film 170 are all arranged towards the light guide plate 140.

[0055] The connection between the lamp panel 110 and the rear light reflection film 130, the rear light reflection film 130 and the light guide plate 140, the light guide plate 140 and the front diffusion film 150, the front diffusion film 150 and the front light reflection film 170, the upper light reflection film 120 and the light guide plate 140, and the lower light reflection film 160 and the light guide plate 140 are all adhesive, which can be specifically bonded by light-transmitting ultra-thin 3M double-sided adhesive.

[0056] The present embodiment is provided with an upper light reflection film 120 and a lower light reflection film 160 on the top and bottom of the light guide plate 140 respectively. These two layers of light reflection films not only increase the opportunity for light reflection, but also form a closed optical system, which maximizes light loss. The reflection surfaces of the upper light reflection film 120 and the lower light reflection film 160 are all arranged towards the light guide plate 140, so that any light that fails to directly penetrate the light guide plate 140 can be reflected back into the light guide plate 140 to participate in the subsequent light distribution process. This multi-layer reflection design effectively solves the problem of uneven brightness in traditional backlight modules 100, ensuring multiple reflections and refractions of light within the light guide plate 140, and achieving a more uniform lighting effect.

[0057] In order to ensure the close connection and stable performance between the components, the connection mode between the lamp plate 110 and the rear reflective film 130, the rear reflective film 130 and the light guide plate 140, the light guide plate 140 and the front diffusion film 150, the front diffusion film 150 and the front reflective film 170, the upper reflective film 120 and the light guide plate 140, and the lower reflective film 160 and the light guide plate 140 is all adhesive, which can be specifically bonded by light-transmitting ultra-thin M double-sided adhesive. This bonding method not only ensures the seamless connection between the layers of materials, but also maintains good light transmission and reflection efficiency, avoiding light loss caused by air gap.

[0058] Referring Figure 3 The utility model also provides a kind of display, including the backlight module 100 of any one embodiment described above, fixed plate 200, front frame 300 and display screen module 400.Wherein, front frame 300 has power lamp window;Fixed plate 200 is located in one side of front frame 300;Display screen module 400 is located in the other side of front frame 300;Backlight module 100 is located between fixed plate 200 and front frame 300, and is located in power lamp window.

[0059] In the design of the display, the backlight module 100 is installed between the fixed plate 200 and the front frame 300, ensuring that it is located near the power lamp window. To achieve this layout, the edge of the backlight module 100 is provided with a structure that aligns with the stud or other fixing point on the fixed plate 200 and is fastened, which is stably connected by mechanical fixing methods such as screws or buckles. To ensure close contact between the backlight module 100 and the fixed plate 200 and the front frame 300, and to help distribute the light source evenly, a buffer material such as foam tape is added between them.

[0060] The fixed plate 200 is located on one side of the front frame 300, and the two are fixed by screws or buckles. The fixed plate 200 is provided with holes or slots that cooperate with the corresponding structures on the front frame 300 to ensure the firm combination of the two. The fixed plate 200 carries other internal electronic components, such as power boards and control circuit boards, which are connected to the interfaces on the fixed plate 200 through welding or plug-in methods, forming a stable electrical connection.

[0061] The display screen module 400 is located on the other side of the front frame 300, facing the user. It is fixed on the front frame 300 by screws, or uses mechanical fixing devices such as buckles to enhance stability. The connection between the display screen module 400 and the internal drive circuit is completed by flexible circuit board (FPC) or cable, and these connection cables pass through the wiring holes reserved in the front frame 300 and are connected to the corresponding interfaces on the fixed plate 200, ensuring the reliability of signal transmission.

[0062] The front frame 300 is provided with a power lamp window, the position and size of which are designed in consideration of the visibility of the power indicator light and the overall appearance. The power indicator light is an LED light welded on a circuit board, and then the light is transmitted to the power lamp window through a light guide column or a transparent pipe, so that the light can be clearly displayed through the window. If the backlight module 100 covers the power lamp window, it is ensured that the light of the indicator light can be effectively transmitted to the outside through the backlight module 100, and at the same time, it will not become unobvious due to the influence of the backlight.

[0063] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A backlight module, characterized in that, The backlight module (100) comprises: a lamp panel (110) provided with light sources at both ends; a light guide panel (140) provided on one side of the lamp panel (110), the light guide panel (140) being provided with a plurality of light guide portions (141), the interval between two adjacent light guide portions (141) gradually decreasing from both ends of the light guide panel (140) to the middle of the light guide panel (140); a rear light reflection film (130) provided between the lamp panel (110) and the light guide panel (140) for reflecting light not directly captured by the light guide panel (140) to the light guide panel (140).

2. The backlight module of claim 1, wherein, The interval between two adjacent light guide portions (141) is 0.5-2 mm, and the interval decreases by 0.02 mm.

3. The backlight module of claim 1, wherein, The diameter of the light guide portions (141) at both ends of the light guide panel (140) is greater than the diameter of the light guide portions (141) at the middle of the light guide panel (140).

4. The backlight module according to any one of claims 1-3, wherein, The side of the light guide panel (140) facing away from the rear light reflection film (130) is provided with a front diffusion film (150) for homogenizing the light.

5. The backlight module of claim 4, wherein, The side of the front diffusion film (150) facing away from the light guide panel (140) is provided with a front light reflection film (170).

6. The backlight module of claim 5, wherein, The top of the light guide panel (140) is provided with an upper light reflection film (120), one side of the upper light reflection film (120) abutting against the lamp panel (110) and the other side abutting against the front light reflection film (170).

7. The backlight module of claim 6, wherein, The bottom of the light guide panel (140) is provided with a lower light reflection film (160), one side of the lower light reflection film (160) abutting against the lamp panel (110) and the other side abutting against the front light reflection film (170).

8. The backlight module of claim 7, wherein, The reflection surfaces of the upper light reflection film (120), the rear light reflection film (130), the lower light reflection film (160) and the front light reflection film (170) all face the light guide panel (140).

9. The backlight module of claim 7, wherein, The connection between the lamp panel (110) and the rear light reflection film (130), the rear light reflection film (130) and the light guide panel (140), the light guide panel (140) and the front diffusion film (150), the front diffusion film (150) and the front light reflection film (170), the upper light reflection film (120) and the light guide panel (140) and the lower light reflection film (160) and the light guide panel (140) is all adhesive connection.

10. A display, characterized by The backlight module (100) comprises: a front frame (300) provided with a power lamp window; a fixing plate (200) provided on one side of the front frame (300); a display screen module (400) provided on the other side of the front frame (300); the backlight module (100) according to any one of claims 1-9 is provided between the fixing plate (200) and the front frame (300) and located in the power lamp window.

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