CN211857133U

CN211857133U - Backlight module

Info

Publication number: CN211857133U
Application number: CN201821497675.1U
Authority: CN
Inventors: 黄芬; 庄少校; 吴德生
Original assignee: Truly Opto Electronics Ltd
Current assignee: Truly Opto Electronics Ltd
Priority date: 2018-09-13
Filing date: 2018-09-13
Publication date: 2020-11-03
Anticipated expiration: 2028-09-13

Abstract

The utility model discloses a backlight module, which comprises a light guide plate and an upper substrate, and is characterized in that the upper substrate is positioned above the light guide plate, and an optical adhesive layer is arranged between the upper substrate and the light guide plate; the upper surface of the light guide plate is provided with a diffusion film layer, and the lower surface of the light guide plate is provided with a reflection film layer; the upper surface of the upper substrate is provided with an upper brightness enhancement film, and the lower surface of the upper substrate is provided with a lower brightness enhancement film. The utility model discloses combine the blooming of different effects to top sheet base plate and light guide plate, make backlight unit reduce to two-layer by traditional five layers of material structures, retrencied assembly process, practiced thrift personnel and cost. The utility model discloses a light guide plate and last piece base plate all select glass, and glass's optical property is more stable, and light-emitting luminance is better, consequently can improve backlight unit's optical effect.

Description

Backlight module

Technical Field

The utility model relates to a mainly relate to and show technical field, more specifically relate to a backlight unit.

Background

In a conventional backlight module, a diffusion film, a lower brightness enhancement film and an upper brightness enhancement film are sequentially disposed above a light guide plate. The reflecting film is positioned at the bottom of the backlight module and is positioned below the light guide plate.

The backlight module comprises five layers of structures of a reflecting film, a light guide plate, a diffusion film, a lower light enhancement film and an upper light enhancement film which are sequentially stacked, and the light enhancement film, the diffusion film and the light guide plate basically plate corresponding effect film layers on PET or PC, so that the backlight module is thicker, and the multilayer structure enables the optical effect to be poor. In the manufacturing process engineering, the five-layer structure needs to be attached and aligned, the assembly process is complex, and the cost is high.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides a backlight module, this backlight unit can reduce the quantity on layer, and can guarantee backlight module's optical effect.

The utility model discloses a backlight module, which comprises a light guide plate and an upper substrate, wherein the upper substrate is positioned above the light guide plate, and an optical adhesive layer is arranged between the upper substrate and the light guide plate; the upper surface of the light guide plate is provided with a diffusion film layer, and the lower surface of the light guide plate is provided with a reflection film layer; the upper surface of the upper substrate is provided with an upper brightness enhancement film, and the lower surface of the upper substrate is provided with a lower brightness enhancement film.

Further, the light guide plate is a glass light guide plate, and the upper substrate is a glass substrate.

Furthermore, a protective layer is arranged on one surface of the reflection film layer, which is far away from the light guide plate.

Further, the material of the light guide plate and/or the upper substrate is inorganic glass.

Furthermore, a first basic film layer is arranged between the upper glass substrate and the upper brightness enhancement film, and a second basic film layer is arranged between the upper glass substrate and the lower brightness enhancement film.

Further, a third base film layer is provided between the light guide plate and the diffusion film layer.

Further, a fourth base film layer is provided between the light guide plate and the reflective film layer.

Further, the first base film layer, the second base film layer, the third base film layer and the fourth base film layer are PET material film layers.

Further, the thickness range of any one of the light guide plate and the upper sheet substrate is 0.20-0.30 mm.

Furthermore, the thickness range of any one of the diffusion film layer, the reflection film layer, the upper brightness enhancement film and the lower brightness enhancement film is 4-20 nm.

Has the advantages that:

the utility model discloses combine the blooming of different effects to top sheet base plate and light guide plate, make backlight unit reduce to two-layer by traditional five layers of material structures, retrencied assembly process, practiced thrift personnel and cost. The utility model discloses a light guide plate and last piece base plate all select glass, and glass's optical property is more stable, and light-emitting luminance is better, consequently can improve backlight unit's optical effect.

Drawings

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention.

Reference numerals:

1-upper substrate, 2-light guide plate, 3-optical adhesive layer, 4-upper brightness enhancement film, 5-lower brightness enhancement film,

6-diffusion film layer, 7-reflection film layer and 8-protective layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 1 is a drawing of an embodiment of the present invention.

The embodiment of the utility model provides a backlight module, including light guide plate 2. The light guide plate 2 is preferably a glass light guide plate, and has high transmittance. Furthermore, the glass used for the light guide plate 2 is inorganic glass, which not only has good transmittance, but also has stable mechanical properties.

The upper surface of the light guide plate 2 is provided with a diffusion film layer 6. The diffusion film layer 6 is an optical film layer formed on the upper surface of the light guide plate 2 by a coating process using a composite copolymer. The diffusion film layer 6 contains a composite copolymer and light diffusion fine particles uniformly dispersed in the composite copolymer. The copolymer composition is preferably an acrylic resin. The diffusion film layer 6 diffuses light from the light guide plate by using diffusion particles, so that the light is more uniform. The light diffusing fine particles may be any known light diffusing fine particles, and are not particularly limited as long as they have a light diffusing effect on visible light, and for example, they may be opaque beads made of resin. The light diffusion particles and the composite copolymer have different refractive indices, and light entering the diffusion film layer 6 is refracted in the light diffusion particles and passes through the light diffusion particles to be diffused.

The coating method can be various, such as vacuum thermal evaporation, electron beam evaporation, magnetron sputtering coating, plasma chemical vapor deposition, and the like.

The lower surface of the light guide plate 2 is provided with a reflecting film layer 7. The reflective film layer 7 is an optical film layer formed on the lower surface of the light guide plate 2 by a coating process. The reflective film layer 7 is made of a material having a function of reflecting light, and the reflective film layer 7 is generally a metal reflective film layer. The metal reflecting film layer 7 is preferably a silver-plated film layer which has high reflectivity and long service life. Of course, the reflective film layer 7 may be other types of highly reflective film layers.

The reflective film 7 reflects the light leaking to the lower side through the light guide plate, thereby reducing light loss and increasing brightness.

In order to protect the reflective film layer 7, a protective layer 8 is further disposed on the exposed surface of the reflective film layer 7, and the protective layer 8 is located on a side surface of the reflective film layer 7, which is away from the light guide plate 2. The protective layer 8 may be a polymer layer or an inorganic protective layer such as an alumina layer, a titanium oxide layer, or a silicon oxide layer.

An upper substrate 1 is provided above the light guide plate 2. The upper substrate 1 is preferably made of glass, and glass has good light transmittance. The glass of the upper substrate 1 is preferably an inorganic glass, and has not only a high transmittance but also stable mechanical properties.

The upper and lower surfaces of the upper substrate 1 are respectively plated with an upper brightness enhancement film 4 and a lower brightness enhancement film 5 with brightness enhancement effect.

The utility model discloses combine the blooming of different effects to top sheet base plate and light guide plate, make backlight unit reduce to two-layer by traditional five layers of material structures. Compare with conventional structure in a poor light, the utility model discloses but attenuate thickness reaches more than 0.2 mm. According to the reliability experiment result, the defects of film wrinkling, lamp explosion and the like are easy to occur after the common backlight is thinned.

If the upper and lower light-enhancing film layers and the diffusion film layer are sequentially coated on the upper side of the light guide plate, the process is complicated and complicated compared with the present embodiment, and interference may occur between the film layers. The scheme of the embodiment has simple process, and different film layers can not be interfered.

The upper and lower

brightness enhancement films

4 and 5 are optical films of a prism pattern formed on the upper and lower surfaces of the upper substrate 1 by using acrylic resin and precision molding, respectively, and function to concentrate the dispersed light emitted from the light source to the front direction, thereby improving the brightness.

In order to form the regular prism patterns on the upper and lower

brightness enhancement films

4 and 5, a base film (not shown) may be first coated with a PET material on the upper substrate 1, and then the prism patterns as required may be formed on the base film. A first base film layer (not shown) is provided between the upper substrate 1 and the upper brightness enhancement film 4, and a second base film layer (not shown) is provided between the upper substrate 1 and the lower brightness enhancement film 5. The basic film is formed on the glass, the film is coated on the basic film to form the pattern, the optical film with the optical effect required by people is achieved, the reliability and the performance of the glass are stable, the glass is not prone to deformation in a high-temperature environment, the hardness of the glass is good in all aspects, the defects such as wrinkles related to the optical film layer can be avoided, and therefore the problem of the wrinkle film can be avoided to a great extent.

A third base film layer is provided between the light guide plate and the diffusion film layer. A fourth base film layer is provided between the light guide plate and the reflective film layer. Further, the third base film layer and the fourth base film layer are PET material film layers.

An optical adhesive layer 3 is also arranged between the upper sheet substrate 1 and the light guide plate 2. The optical adhesive layer 3 is, for example, OCA or OCR optical adhesive.

When the light guide plate 2 and the upper substrate 1 are made of glass, the thickness of the glass light guide plate 2 is 0.20-0.30 mm. The thickness of the upper substrate 1 is 0.20 to 0.30 mm.

The thicknesses of the diffusion film layer 6, the reflection film layer 7, the upper brightness enhancement film 4 and the lower brightness enhancement film 5 are respectively 4-20 nm. The thicknesses of the diffusion film layer 6, the reflection film layer 7, the upper brightness enhancement film 4 and the lower brightness enhancement film 5 can reach 4-5nm at the thinnest respectively.

Has the advantages that:

The utility model discloses thickness in a poor light has still been attenuate. According to the reliability experiment result of people, bad phenomena such as membrane wrinkle and lamp explosion easily occur after the common backlight is thinned, the basic membrane is formed on the glass firstly, and then the membrane is coated on the basic membrane to form the pattern, so that the optical membrane with the optical effect required by people is achieved, the reliability performance of the glass is stable, the glass is not easy to deform in a high-temperature environment, the hardness of the glass is good in all aspects, the bad phenomena such as the wrinkle related to the optical membrane layer can be avoided, and the problem of the membrane wrinkle can be avoided to a great extent.

The utility model provides a pair of backlight unit can improve the optical effect in a poor light and can be to a certain extent through attenuate backlight unit's thickness and practice thrift the cost.

It will be understood that modifications and variations can be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the appended claims.

Claims

1. A backlight module comprises a light guide plate and an upper substrate, and is characterized in that the upper substrate is positioned above the light guide plate, and an optical adhesive layer is arranged between the upper substrate and the light guide plate; the upper surface of the light guide plate is provided with a diffusion film layer, and the lower surface of the light guide plate is provided with a reflection film layer; the upper surface of the upper substrate is provided with an upper brightness enhancement film, and the lower surface of the upper substrate is provided with a lower brightness enhancement film.

2. The backlight module as claimed in claim 1, wherein the light guide plate is a glass light guide plate, and the upper substrate is a glass substrate.

3. The backlight module as claimed in claim 1, wherein a protective layer is further disposed on a surface of the reflective film layer facing away from the light guide plate.

4. The backlight module according to claim 2, wherein the light guide plate and/or the top substrate is made of inorganic glass.

5. The backlight module of claim 2, wherein a first base film layer is disposed between the upper substrate and the upper brightness enhancement film, and a second base film layer is disposed between the upper glass substrate and the lower brightness enhancement film.

6. The backlight module according to claim 2, wherein a third base film layer is provided between the light guide plate and the diffusion film layer.

7. The backlight module according to claim 2, wherein a fourth base film layer is disposed between the light guide plate and the reflective film layer.

8. The backlight module according to claim 2, wherein the thickness of any one of the light guide plate and the upper substrate is in the range of 0.20 to 0.30 mm.

9. The backlight module as claimed in claim 1, wherein the thickness of any one of the diffusion film layer, the reflection film layer, the upper brightness enhancement film and the lower brightness enhancement film is 4-20 nm.