Direct type LED backlight module
By introducing the LED light board mounting cavity and light collecting plate structure into the direct-type LED backlight module, combined with the design of reflective sheet, fluorescent layer, diffusion film and brightening sheet, the problems of low light utilization and uneven brightness are solved, and the effects of high brightness and thinness are achieved.
Patent Information
- Application Number
- CN202422934366.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Existing direct-lit LED backlight modules have problems such as low light utilization, uneven brightness, difficulty in thinning, and severe light loss.
It adopts the LED light board mounting cavity and light collecting plate structure, combined with the design of reflector, fluorescent layer, light guide plate, diffusion film and brightening sheet, and uses diffusion particles and low refractive index layer to improve light utilization and uniformity, realize the conversion of LED from point light source to surface light source, and reduce light loss through thin design.
The light utilization rate and brightness uniformity are improved, a high-brightness backlight module is achieved, and at the same time, the module is made thinner and light loss is reduced.
Smart Images
Figure CN223450287U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a backlight module, in particular to a direct 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 type (side-in type), and the direct type backlight module is suitable for medium and large backlight, and the light source is located below the light guide plate, generally by several LED lamps as light source. After the light emitted by the light source is reflected by the reflecting sheet, the light is uniformly distributed through the light guide plate, diffusion film and prism film, and then a good brightness and uniform light source is obtained. However, since the LED lamp has a certain angle of emission, a part of the light will be emitted to the side, resulting in low light utilization rate and affecting the brightness of the whole backlight module. Moreover, the LED light source is a point light source, and the number of lamps used is large, and the mixing distance is long, which makes it difficult to thin the direct type LED backlight module. In addition, in order to make the light uniformity of the backlight module higher, manufacturers often think of using several diffusion films with high cover rate to uniform the light, but the diffusion film with high cover rate often has a loss of brightness. SUMMARY
[0004] The utility model aims at overcoming the defects of prior art, and provides a direct type LED backlight module with high light utilization rate, high brightness, uniform brightness, less light loss and thin type.
[0005] The technical scheme of the utility model is as follows:
[0006] A direct type LED backlight module, comprising an LED lamp plate mounting cavity, an LED lamp plate, a light collecting plate, a reflecting sheet, a fluorescent layer, a light guide plate, a diffusion film and a brightness enhancement film, the LED lamp plate is accommodated in the LED lamp plate mounting cavity, the LED lamp plate is provided with a plurality of rows of LED lamps arranged side by side, the light collecting plate is accommodated in the LED lamp plate mounting cavity and covers the LED lamp plate, lampshades are arranged on the light collecting plate corresponding to the positions of the LED lamps, the top of the lampshade protrudes from the light collecting plate, the reflecting sheet is arranged on the light collecting plate and covers the LED lamp plate mounting cavity, lampshade holes are formed in the reflecting sheet corresponding to the positions of the top of the lampshade, and the fluorescent layer, the light guide plate, the diffusion film and the brightness enhancement film are sequentially arranged on the reflecting sheet from bottom to top and correspond to the reflecting sheet.
[0007] Further, the LED lamp plate is a whole printed circuit board, and a plurality of rows of LED lamps arranged side by side are welded on the printed circuit board.
[0008] Further, the fluorescent layer contains first diffusion particles.
[0009] Further, the first diffusion particles are PMMA particles.
[0010] Further, the diffusion film is composed of a transparent substrate, a protective coating arranged on the bottom surface of the transparent substrate, and a diffusion layer arranged on the top surface of the transparent substrate.
[0011] Further, the protective coating and the diffusion layer both contain second diffusion particles, and the content of the second diffusion particles in the diffusion layer is higher than that in the protective coating.
[0012] Further, the second diffusion particles are PMMA particles.
[0013] Further, the brightness enhancement film is composed of a PET layer, a prismatic layer arranged on the top surface of the PET layer, and a flat coating layer with a low refractive index arranged on the bottom surface of the PET layer.
[0014] Compared with the prior art, the utility model has the beneficial effects that:
[0015] (1) through setting up LED lamp plate installation cavity, and containing LED lamp plate and a light collecting plate in LED lamp plate installation cavity, light collecting plate cover is established on LED lamp plate, and the position of light collecting plate corresponding to LED lamp is equipped with lamp shade, and the top of lamp shade protrudes from light collecting plate, and the reflection sheet covering LED lamp plate installation cavity is arranged on light collecting plate, the lamp shade hole is set up in the position corresponding to the top of lamp shade, and the light emitted by LED lamp can be utilized and diffused evenly under the action of lamp shade, and part of light can be reflected under the action of reflection sheet, therefore, the light utilization rate and uniformity of LED lamp can be greatly improved through the structure design, thereby improving the brightness uniformity and luminance of backlight module;
[0016] (2) the fluorescent layer, light guide plate, diffusion film and brightness enhancement film are sequentially arranged on the reflection sheet from bottom to top, wherein the fluorescent layer contains diffusion particles, can realize the change of LED from point light source to area light source, shorten the light mixing distance, make the backlight module thin, and the structure design of diffusion film and brightness enhancement film is helpful to improve the uniformity and brightness of light and reduce light loss. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to make the technical scheme in the embodiments of the present application clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort.
[0018] Figure 1 A structure exploded view of the direct type LED backlight module is provided in the present application.
[0019] Figure 2 A composition schematic view of the direct type LED backlight module is provided in the present application.
[0020] Figure 3 A structure schematic view of the diffusion film is provided in the present application.
[0021] Figure 4 A structure schematic view of the brightness enhancement film is provided in the present application. DETAILED DESCRIPTION
[0022] In order to make the technical scheme in the embodiments of the present application clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort.
[0023] In order to make the technical scheme in the embodiments of the present application clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort.
[0024] EMBODIMENT
[0025] Please refer to Figure 1 , Figure 2The embodiment provides a direct type LED backlight module, which comprises an LED lamp plate mounting cavity 1, an LED lamp plate 2, a light collecting plate 3, a reflecting sheet 4, a fluorescent layer 5, a light guide plate 6, a diffusion film 7 and a brightness enhancement film 8. The LED lamp plate 2 and the light collecting plate 3 are accommodated in the LED lamp plate mounting cavity 1, the LED lamp plate 2 is provided with a plurality of rows of LED lamps 21 arranged side by side, the light collecting plate 3 is arranged on the LED lamp plate 2, the light collecting plate 3 is provided with lamp covers 31 corresponding to positions of the LED lamps 21, the top of the lamp cover 31 protrudes from the light collecting plate 3, the reflecting sheet 4 is arranged on the light collecting plate 3 and covers the LED lamp plate mounting cavity 1, the reflecting sheet 4 is provided with lamp cover holes 41 corresponding to positions of the top of the lamp cover 31, the light emitted by the LED lamps 21 can be utilized and uniformly diffused under the action of the lamp cover 31, and part of the light can be reflected under the action of the reflecting sheet 4, the light utilization rate and uniformity of the LED lamp can be greatly improved through the structural design, so that the brightness uniformity and luminance of the backlight module are improved; the fluorescent layer 5, the light guide plate 6, the diffusion film 7 and the brightness enhancement film 8 are sequentially arranged on the reflecting sheet 4 from bottom to top and correspond to the reflecting sheet 4, the fluorescent layer 5 contains first diffusion particles, the first diffusion particles are PMMA particles, the LED can be changed from a point light source to a surface light source through the fluorescent layer 5, so that the mixing distance is shortened, the backlight module is thinned, and the uniformity and brightness of the light are improved through the structural design of the diffusion film and the brightness enhancement film, and the light loss is reduced.
[0026] Specifically, the LED lamp plate 2 is an integral printed circuit board, a plurality of rows of LED lamps 21 are welded on the printed circuit board, and adjacent LED lamps 21 have spacing spaces.
[0027] Specifically, in combination with Figure 3 As shown in the figure, the diffusion film 7 is composed of a transparent substrate 71, a protective coating 72 arranged on the bottom surface of the transparent substrate 71 and a diffusion layer 73 arranged on the top surface of the transparent substrate 71, the protective coating 72 and the diffusion layer 73 both contain second diffusion particles 74, the second diffusion particles 74 are PMMA particles, and the content of the second diffusion particles 74 in the diffusion layer 73 is higher than that in the protective coating 72. The light emitting surface of the diffusion film 73 has good light reflecting ability with the increase of the diffusion particles, so that the uniformity and brightness of the light emission are improved.
[0028] Specifically, in combination with Figure 4As shown, the brightness enhancement film 8 is composed of a PET layer 81, a prism layer 82 arranged on the top surface of the PET layer 81, and a flat coating layer 83 with low refractive index arranged on the bottom surface of the PET layer 81. The arrangement of the prism layer 82 helps to improve the brightness of the backlight module, and since the smaller the refractive index of the medium incident on the back surface of the brightness enhancement film 8, the smaller the interface reflection, the less the light loss. The refractive index of the PET layer 81 is 1.55, and by adding a flat coating layer 83 with low refractive index on the bottom surface of the PET layer 81, the light loss is reduced.
[0029] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A direct-lit LED backlight module, characterized in that: It includes an LED light board mounting cavity, an LED light board, a light collecting plate, a reflective sheet, a fluorescent layer, a light guide plate, a diffusion film and a brightening sheet. The LED light board is accommodated in the LED light board mounting cavity. The LED light board is protruding with several rows of LED lights arranged side by side. The light collecting plate is accommodated in the LED light board mounting cavity and covered on the LED light board. The positions of the light collecting plate corresponding to the LED lights are provided with lampshades. The top of the lampshade protrudes from the light collecting plate. The reflective sheet is arranged on the light collecting plate and covers the LED light board mounting cavity. The position of the reflective sheet corresponding to the top of the lampshade is provided with a lampshade hole. The fluorescent layer, light guide plate, diffusion film and brightening sheet are arranged on the reflective sheet from bottom to top and correspond to the reflective sheet.
2. The direct-lit LED backlight module according to claim 1, wherein: The LED lamp board is a whole printed circuit board, on which a plurality of rows of LED lamps arranged side by side are welded, and there is space between adjacent LED lamps.
3. The direct-lit LED backlight module according to claim 1, characterized in that: The diffusion film consists of a transparent substrate, a protective coating layer arranged on the bottom surface of the transparent substrate, and a diffusion layer arranged on the top surface of the transparent substrate.
4. The direct-lit LED backlight module according to claim 1, wherein: The brightness enhancement sheet consists of a PET layer, a prism layer arranged on the top surface of the PET layer, and a flat coating layer with a low refractive index arranged on the bottom surface of the PET layer.