Side light type LED backlight module

Abstract

The utility model discloses a sidelight type LED backlight module which comprises an upper diffusion film, an upper prism brightness enhancement film, a lower prism brightness enhancement film, a lower diffusion film, a light guide plate, a reflector plate and LED light sources, the light guide plate is arranged on the reflector plate, a packaging structure is arranged on one side of the light guide plate, a plurality of hemispherical cavities which are arranged in the same row and can contain the LED light sources are formed in the packaging structure, and the LED light sources are arranged in the hemispherical cavities. The LED light source is arranged in the semispherical cavity, light emitted by the LED light source is emitted to the light guide plate through the top of the semispherical cavity, the other side of the light guide plate is provided with a reflection slope arranged upwards, the area of the top face of the light guide plate is larger than that of the bottom face of the light guide plate, and the reflection piece is matched with the bottom face of the light guide plate. The lower diffusion film is arranged on the light guide plate and is matched with the top surface of the light guide plate, the lower prism brightness enhancement film is arranged on the lower diffusion film, the upper prism brightness enhancement film is arranged on the lower prism brightness enhancement film, and the upper diffusion film is arranged on the upper prism brightness enhancement film. The LED lamp has the characteristics of uniform brightness and high brightness.

Description

TECHNICAL FIELD

[0001] The utility model relates to a backlight module, in particular to a side light type LED backlight module. BACKGROUND

[0002] Liquid crystal display panel has been widely applied to the display screen of computer, mobile phone, TV, navigator, digital camera and other instruments. Since liquid crystal panel does not emit light itself, and backlight module as one of the key components of liquid crystal display panel plays the role of providing sufficient brightness and uniform light.

[0003] As the light source provider of liquid crystal display, backlight module is mainly composed of the following components: light source, lampshade, light guide plate, reflecting sheet, diffusion film, prism film, etc. The backlight module of the commonly seen liquid crystal display on the market can be divided into direct type and side light type (side-in type), the direct type backlight module is suitable for medium and large backlight, the light source is located below the light guide plate, generally has two or more light sources, after the light emitted by the light source is reflected by the reflecting sheet, the light guide plate, diffusion film and prism film uniformly light, the surface lamp source with good brightness and uniform light is obtained. The direct type backlight module has the advantages of high brightness and good viewing angle, but the direct type backlight is heavy, and is not suitable for customers who have requirements on portability and thinness. The side light type backlight module is suitable for medium and small backlight, the light source is located on one side of the light guide plate, and the side light type backlight module has the advantages of lightness, thinness and energy saving. The side light type backlight module meets the requirements of customers on portable, narrow frame, thin and light display such as mobile phone, notebook computer and TV, and is therefore more and more popular.

[0004] The light of the side light type backlight module is more difficult to be uniformly distributed compared with the direct type backlight module, and the phenomenon of one side being dark and the other side being bright is easily caused. At this time, manufacturers often think of using one or several diffusion films with high haze and high hiding power to uniformly light, but the diffusion film with high haze and high hiding power often causes loss of brightness. Based on the idea of wanting to uniformly light and not causing loss of brightness, the side light type LED backlight module is provided to achieve the purpose. TECHNICAL SOLUTION

[0005] The utility model aims at overcoming the defects of prior art, and provides a side light type LED backlight module, which has the characteristics of uniform brightness and high brightness.

[0006] The technical scheme of the utility model is as follows:

[0007] A side light type LED backlight module, comprising an upper diffusion film, an upper prism brightening film, a lower prism brightening film, a lower diffusion film, a light guide plate, a reflecting sheet and an LED light source, the light guide plate is arranged on the reflecting sheet, one side of the light guide plate is provided with an encapsulation structure, a plurality of semispherical cavities capable of accommodating the LED light source are arranged in the encapsulation structure, the LED light source is arranged in the semispherical cavity, the light emitted by the LED light source is emitted to the light guide plate through the top of the semispherical cavity, the other side of the light guide plate is provided with an upwardly arranged reflecting slope, the top surface area of the light guide plate is greater than the bottom surface area, the reflecting sheet is matched with the bottom surface of the light guide plate, the lower diffusion film is arranged on the light guide plate and matched with the top surface of the light guide plate, the lower prism brightening film is arranged on the lower diffusion film, the upper prism brightening film is arranged on the lower prism brightening film, and the upper diffusion film is arranged on the upper prism brightening film.

[0008] The encapsulation structure is formed by encapsulating one side of the light guide plate with an epoxy resin or a silica gel material.

[0009] The lower diffusion film comprises a first transparent substrate, a first diffusion layer arranged on the bottom surface of the first transparent substrate and a first protective coating layer arranged on the top surface of the first transparent substrate.

[0010] The first diffusion layer and the first protective coating layer both contain first diffusion particles, and the content of the first diffusion particles in the first diffusion layer is higher than that in the first protective coating layer.

[0011] The first diffusion particles are PMMA particles.

[0012] The lower prism brightening film comprises a first PET layer, a first prism layer arranged on the top surface of the first PET layer and a flat coating layer with a low refractive index arranged on the bottom surface of the first PET layer.

[0013] The upper prism brightening film comprises a second PET layer, a second prism layer arranged on the top surface of the second PET layer and a haze layer arranged on the bottom surface of the second PET layer.

[0014] The upper diffusion film comprises a second transparent substrate, a second protective coating layer arranged on the bottom surface of the second transparent substrate and a second diffusion layer arranged on the top surface of the second transparent substrate.

[0015] The second protective coating layer and the second diffusion layer both contain second diffusion particles, and the content of the second diffusion particles in the second diffusion layer is higher than that in the second protective coating layer.

[0016] The second diffusion particles are PMMA particles.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] (1) by in the light guide plate side formed with the encapsulation structure, and in the encapsulation structure is opened with a plurality of same row setting can accommodate LED light source's hemispherical cavity, LED light source emits light through the top of the hemispherical cavity to the light guide plate, the hemispherical cavity can make the light energy emitted by the LED light source evenly diffuse, thereby improving the light uniformity of the backlight module;

[0019] (2) by in the light guide plate the other side is formed with the reflection inclined plane that sets up to the upward, the light that reaches the other side of the light guide plate is under the reflection of the reflection inclined plane and shoots to the diffusion film, the prism brightening film direction, relative to the plane design luminance is higher, simultaneously because the light guide plate and the reflection sheet required volume is smaller, thereby reduces the material cost;

[0020] (3) by setting up two layers of diffusion film and two layers of prism brightening film, and combining the structure design of diffusion film and prism brightening film, it is helpful to improve the uniformity, haze and brightness of light, reduce light loss. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiment of the present application, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 The structural composition diagram of the side light type LED backlight module provided by the present application is shown.

[0023] Figure 2 The structural schematic diagram of the lower diffusion film of the present application is shown.

[0024] Figure 3 The structural schematic diagram of the upper diffusion film of the present application is shown. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will further describe the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

[0026] In order to illustrate the technical scheme of the present application, the following will be described by specific embodiments.

[0027] EMBODIMENT

[0028] Please refer to Figure 1This embodiment provides an edge-lit LED backlight module, comprising an upper diffuser 1, an upper prism brightness enhancement film 2, a lower prism brightness enhancement film 3, a lower diffuser 4, a light guide plate 5, a reflective sheet 6, and an LED light source 7. The light guide plate 5 is disposed on the reflective sheet 6. A packaging structure 8 is provided on one side of the light guide plate 5. The packaging structure 8 defines a plurality of hemispherical cavities 9 arranged in a row and capable of accommodating the LED light sources 7. The LED light sources 7 are disposed in the hemispherical cavities 9. Light emitted by the LED light sources 7 is directed toward the light guide plate 5 through the top of the hemispherical cavities 9. An upwardly facing reflective slope 51 is provided on the other side of the light guide plate 5. The top surface area of ​​the light guide plate 5 is larger than the bottom surface area. The reflective sheet 6 is adapted to the bottom surface of the light guide plate 5. The lower diffuser 4 is disposed on the light guide plate 5 and adapted to the top surface of the light guide plate 5. The lower prism brightness enhancement film 3 is disposed on the lower diffuser 4. The upper prism brightness enhancement film 2 is disposed on the lower prism brightness enhancement film 3. The upper diffuser 4 is disposed on the upper prism brightness enhancement film 2.

[0029] The encapsulation structure 8 is formed by encapsulating one side of the light guide plate 5 with epoxy resin or silicone. The hemispherical cavity 9 evenly diffuses the light energy emitted by the LED light source 7, thereby improving the uniformity of the light of the backlight module. The reflective bevel 51 on the other side of the light guide plate 5 reflects light from the other side of the light guide plate 5 toward the diffusion film and prismatic brightness enhancement film. This results in higher brightness than a flat design. Furthermore, the required volume of the light guide plate 5 and reflective sheet 6 is reduced, thereby reducing material costs.

[0030] Combine Figure 2 As shown, the lower diffusion film 4 is composed of a first transparent substrate 41, a first diffusion layer 42 provided on the bottom surface of the first transparent substrate 41, and a first protective coating layer 43 provided on the top surface of the first transparent substrate 41. The first diffusion layer 42 and the first protective coating layer 43 both contain first diffusion particles 44, which are PMMA particles. The content of the first diffusion particles 44 in the first diffusion layer 42 is higher than the content of the first diffusion particles 44 in the first protective coating layer 43.

[0031] Combine Figure 3 As shown, the upper diffusion film 1 is composed of a second transparent substrate 11, a second protective coating layer 12 provided on the bottom surface of the second transparent substrate 11, and a second diffusion layer 13 provided on the top surface of the second transparent substrate 11. The second protective coating layer 12 and the second diffusion layer 13 both contain second diffusion particles 14, which are PMMA particles. The content of the second diffusion particles 14 in the second diffusion layer 13 is higher than the content of the second diffusion particles 14 in the second protective coating layer 12.

[0032] With the addition of diffusion particles, the light-incoming surface and the light-outgoing surface of the backlight module have better light-reflecting capabilities, thereby helping to improve the uniformity and brightness of the light.

[0033] The lower prism brightness enhancement film 3 is composed of a first PET layer 31, a first prism layer 32 arranged on the top surface of the first PET layer 31 and a flat coating layer 33 with low refractive index arranged on the bottom surface of the first PET layer 31; the upper prism brightness enhancement film 2 is composed of a second PET layer 21, a second prism layer 22 arranged on the top surface of the second PET layer 21 and a haze layer 23 arranged on the bottom surface of the second PET layer 21. The arrangement of the two-layer prism brightness enhancement film helps to improve the brightness of the backlight module, and since the smaller the refractive index of the incident medium on the back surface of the brightness enhancement film, the smaller the interface reflection, the less the light loss, and the refractive index of the PET layer is 1.55, by adding a low-refractive flat coating layer 33 on the bottom surface of the first PET layer 31, thereby helping to reduce light loss, and the haze layer 23 on the bottom surface of the second PET layer 21 helps to improve the haze of the backlight module.

[0034] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An edge-lit LED backlight module, characterized in that: The utility model comprises an upper diffusion film, an upper prism brightness enhancement film, a lower prism brightness enhancement film, a lower diffusion film, a light guide plate, a reflective sheet and an LED light source, wherein the light guide plate is arranged on the reflective sheet, a packaging structure is provided on one side of the light guide plate, a plurality of hemispherical cavities arranged in the same row and capable of accommodating LED light sources are opened in the packaging structure, the LED light source is arranged in the hemispherical cavity, the light emitted by the LED light source is directed to the light guide plate through the top of the hemispherical cavity, the other side of the light guide plate is provided with an upwardly facing reflective inclined surface, the top surface area of ​​the light guide plate is larger than the bottom surface area, the reflective sheet is adapted to the bottom surface of the light guide plate, the lower diffusion film is arranged on the light guide plate and adapted to the top surface of the light guide plate, the lower prism brightness enhancement film is arranged on the lower diffusion film, the upper prism brightness enhancement film is arranged on the lower prism brightness enhancement film, and the upper diffusion film is arranged on the upper prism brightness enhancement film.

2. The edge-lit LED backlight module according to claim 1, wherein: The packaging structure is formed by packaging one side of the light guide plate with epoxy resin or silicone material.

3. The edge-lit LED backlight module according to claim 1, characterized in that: The lower diffusion film consists of a first transparent substrate, a first diffusion layer arranged on the bottom surface of the first transparent substrate, and a first protective coating layer arranged on the top surface of the first transparent substrate.

4. The edge-lit LED backlight module according to claim 1, wherein: The lower prism brightness enhancement film consists of a first PET layer, a first prism layer arranged on the top surface of the first PET layer, and a flat coating layer with a low refractive index arranged on the bottom surface of the first PET layer.

5. The edge-lit LED backlight module according to claim 1, characterized in that: The upper prism brightness enhancement film consists of a second PET layer, a second prism layer arranged on the top surface of the second PET layer, and an atomization layer arranged on the bottom surface of the second PET layer.

6. The edge-lit LED backlight module according to claim 1, characterized in that: The upper diffusion film consists of a second transparent substrate, a second protective coating layer arranged on the bottom surface of the second transparent substrate, and a second diffusion layer arranged on the top surface of the second transparent substrate.

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