CN204268262U

CN204268262U - Direct LED backlight

Info

Publication number: CN204268262U
Application number: CN201420839132.9U
Authority: CN
Inventors: 宋义; 定毛山; 卢雪平
Original assignee: Shenzhen Diguang Electronics Co Ltd
Current assignee: Dongguan Diguang Electronics Co., Ltd.
Priority date: 2014-12-26
Filing date: 2014-12-26
Publication date: 2015-04-15
Anticipated expiration: 2024-12-26

Abstract

The utility model discloses a kind of direct LED backlight, includes lower cover, diffuser plate, diffusion barrier, bright enhancement film, light-emitting section and reflectance coating; The upper and lower surface of this diffuser plate is formed with multiple first diffusion point and multiple second diffusion point respectively, and the plurality of first diffusion point is distributed in the upper surface of diffuser plate, and the plurality of second diffusion point is distributed in the lower surface of diffuser plate; By adopting blue LED die, and coordinate filter coating, quantum dot fluorescence bisque and light modulation layer, blue light is become white light, adopt white LED chip or the blue LED die that instead of tradition coordinate the mode of bloom layer, the colour rendering index of product so effectively can be improved while reducing costs, brightness also raises, and light loss is less simultaneously; And, by being respectively arranged with the first diffusion point and the second diffusion point in the upper and lower surface of diffuser plate, effectively to strengthen the diffusion effect to light, and coordinating reflectance coating, diffusion barrier and bright enhancement film, make product face light effect better, improving product go out light quality.

Description

Direct LED backlight

Technical field

The utility model relates to backlight art, refers in particular to a kind of direct LED backlight.

Background technology

Backlight (Back Light) is positioned at liquid crystal display (LCD) a kind of light source behind, and its illumination effect will directly have influence on LCD MODULE (LCM) visual effect.Liquid crystal display itself is not luminous, and its display graphics or character are the results that it is modulated light.

In recent years, due to light emitting diode have that volume is little, power consumption is low, the advantage such as long service life, environmental protection, colour gamut are wide, high brightness, become the preferred light source of LCD backlight gradually.

Existing LED backlight is direct-light-type backlight, its light-emitting section is arranged at immediately below diffuser plate, the light directive diffuser plate utilizing light-emitting section to send, light spreads by recycling diffuser plate, it generally adopts existing direct LED backlight is white LED chip, but white LED chip is expensive, make Total Product cost higher; For this reason, also have the mode adopting blue LED die to coordinate bloom layer at present, its blue light utilizing bloom layer to be sent by blue LED die is transformed into white light, but, adopt this mode of bloom layer that the colour rendering index of product is reduced greatly, brightness also reduces, and luminous energy loss is large; In addition, the diffuser plate of existing direct LED backlight, due to existing defects in structural design, causes diffusion effect bad, thus makes the bright dipping Quality Down of LED backlight.

Utility model content

In view of this, the utility model is for the disappearance of prior art existence, its main purpose is to provide a kind of direct LED backlight, and it effectively can solve existing direct LED backlight and has that cost is high, colour rendering index and brightness is low, light loss serious and the problem of bright dipping poor quality.

For achieving the above object, the utility model adopts following technical scheme:

A kind of direct LED backlight, includes lower cover, diffuser plate, diffusion barrier, bright enhancement film, light-emitting section and reflectance coating; The periphery of this diffuser plate is butted on the top perimeter of lower cover, the upper and lower surface of diffuser plate is formed with multiple first diffusion point and multiple second diffusion point respectively by laser dotting, the plurality of first diffusion point is distributed in the upper surface of diffuser plate, the plurality of second diffusion point is distributed in the lower surface of diffuser plate, and the volume of the second diffusion point is greater than the volume of the first diffusion point, the distribution density of the second diffusion point is less than the difference density of the first diffusion point; This diffusion barrier is stacked on diffuser plate, and this bright enhancement film is stacked on diffusion barrier; This light-emitting section to be arranged in lower cover and to be positioned at immediately below diffuser plate, and light-emitting section includes substrate and multiple blue LED die, and the plurality of blue LED die is all arranged on substrate, and each blue LED die is all coated with LED lens outward; This reflectance coating covers the internal face with lower cover, and LED lens expose outside reflectance coating; And the bottom surface of this diffuser plate is coated with light modulation layer, the bottom surface of this light modulation layer is coated with quantum dot fluorescence bisque, and the outer surface of these LED lens is coated with filter coating.

As a kind of preferred version, described LED lens are convex hull shape, and the top of LED lens is arranged with arc caustic surface.

As a kind of preferred version, described diffuser plate, diffusion barrier and bright enhancement film by press box fixing with under cover.

As a kind of preferred version, in described lower cover, be distributed with multiple support column.

As a kind of preferred version, described multiple support column is the prism with reflection function.

As a kind of preferred version, described first diffusion point and the second diffusion point are all in Pyramid.

The utility model compared with prior art has obvious advantage and beneficial effect, specifically, as shown from the above technical solution:

One, by adopting blue LED die, and coordinate filter coating, quantum dot fluorescence bisque and light modulation layer, blue light is become white light, adopt white LED chip or the blue LED die that instead of tradition coordinate the mode of bloom layer, the colour rendering index of product so effectively can be improved while reducing costs, brightness also raises, and light loss is less simultaneously; And, by being respectively arranged with the first diffusion point and the second diffusion point in the upper and lower surface of diffuser plate, effectively to strengthen the diffusion effect to light, and coordinating reflectance coating, diffusion barrier and bright enhancement film, make product face light effect better, improving product go out light quality.

Two, by adopting the mode of laser dotting to be respectively arranged with multiple first diffusion point and multiple second diffusion point in the upper and lower surface of diffuser plate, instead of the mode adopting printing net-point of tradition, make the making of diffuser plate more fast with simple, and light diffusion effect is better.

For more clearly setting forth architectural feature of the present utility model and effect, below in conjunction with accompanying drawing and specific embodiment, the utility model is described in detail.

Accompanying drawing explanation

Fig. 1 is the assembling front schematic perspective view of the preferred embodiment of the utility model;

Fig. 2 is the assembling back side schematic perspective view of the preferred embodiment of the utility model;

Fig. 3 is the sectional view of the preferred embodiment of the utility model;

Fig. 4 is the enlarged diagram of A position in Fig. 3.

Accompanying drawing identifier declaration:

10, lower cover 11, bowl-shape cavity

20, diffuser plate 21, first spreads point

22, the second diffusion point 30, diffusion barrier

40, bright enhancement film 50, light-emitting section

51, substrate 52, blue LED die

53, LED lens 531, arc caustic surface

54, filter coating 60, reflectance coating

70, press box 80, support column.

101, light modulation layer 102, quantum dot fluorescence bisque.

Detailed description of the invention

Please refer to shown in Fig. 1 to Fig. 4, that show the concrete structure of the preferred embodiment of the utility model, include lower cover 10, diffuser plate 20, diffusion barrier 30, bright enhancement film 40, light-emitting section 50 and reflectance coating 60.

This lower cover 10 is plastic cement material, and lower cover 10 has a bowl-shape cavity 11; The top perimeter that the periphery of this diffuser plate 20 is butted on lower cover 10 covers the opening of bowl-shape cavity 11.

As shown in Figure 4, the upper and lower surface of this diffuser plate 20 is formed with multiple first diffusion point 21 and multiple second diffusion point 22 respectively by laser dotting, the plurality of first diffusion point 21 is distributed in the upper surface of diffuser plate 20, the plurality of second diffusion point 22 is distributed in the lower surface of diffuser plate 20, and the volume of the second diffusion point 22 is greater than the volume of the first diffusion point 21, the distribution density of the second diffusion point 22 is less than the difference density of the first diffusion point 21, more evenly spread to make light, and, in the present embodiment, this the first diffusion point 21 and the second diffusion point 22 are all in Pyramid, diffusion effect is better.

This diffusion barrier 30 is stacked on diffuser plate 20, with further enhanced diffustion effect, this bright enhancement film 40 is stacked on diffusion barrier 30, to make light brighter, in the present embodiment, this diffuser plate 20, diffusion barrier 30 and bright enhancement film 40 is fixing with on lower cover 10 by press box 70.Further, the bottom surface of this diffuser plate 20 is coated with light modulation layer 101, and the bottom surface of this light modulation layer 101 is coated with quantum dot fluorescence bisque 102.

This light-emitting section 50 to be arranged in lower cover 10 and to be positioned at immediately below diffuser plate 20, light-emitting section 50 includes substrate 51 and multiple blue LED die 52, the plurality of blue LED die 52 is all arranged on substrate 51, each blue LED die 52 is outer is all coated with LED lens 53, these LED lens 53 are in convex hull shape, and the top of LED lens 53 is arranged with arc caustic surface 531, the light sent to make blue LED die 52 is concentrated and is upwards irradiated, in addition, the outer surface of these LED lens 53 is coated with filter coating 54.

This reflectance coating 60 covers and the internal face of lower cover 10, and this reflectance coating 60 enters diffuser plate 20, LED lens 53 expose outside reflectance coating 60 with upwards being reflected by light.

And, multiple support column 80 is distributed with in this lower cover 10, the plurality of support column 80 is for supporting diffuser plate 20, it is avoided to be subject to external force pressure and to cave inward, further, in the present embodiment, the plurality of support column 80 is the prism with reflection function, can launch light, to make light Homogeneous phase mixing more.

The course of work that the present embodiment is described in detail in detail is as follows:

During work, the blue ray that blue LED die 52 sends is successively through LED lens 53 and filter coating 54, this filter coating 54 is for filtering veiling glare, most of blue light directive quantum dot fluorescence bisque 102 upward under the effect of LED lens 53, fraction side direction injection effect through reflectance coating 60 upwards enters quantum dot fluorescent powder layer 102, the light major part of directive quantum dot fluorescence bisque 102 upwards penetrates through diffusion, fraction reflection directive reflectance coating 60, turning back through reflectance coating 60 enters in quantum dot fluorescent powder layer 102 again, light is when through quantum dot fluorescence bisque 102, blue light is become white light by quantum dot fluorescence bisque 102, utilize light modulation layer 101 pairs of white light to carry out light modulation simultaneously, make light soft, diffusion further in diffusion barrier 30 is entered from diffuser plate 20 light out, then after adding lustre to through bright enhancement film 40, form bright face light and outwards penetrate.

Design focal point of the present utility model is: first, by adopting blue LED die, and coordinate filter coating, quantum dot fluorescence bisque and light modulation layer, blue light is become white light, adopt white LED chip or the blue LED die that instead of tradition coordinate the mode of bloom layer, so effectively can improve the colour rendering index of product while reducing costs, brightness also raises, and light loss is less simultaneously; And, by being respectively arranged with the first diffusion point and the second diffusion point in the upper and lower surface of diffuser plate, effectively to strengthen the diffusion effect to light, and coordinating reflectance coating, diffusion barrier and bright enhancement film, make product face light effect better, improving product go out light quality.Secondly, multiple first diffusion point and multiple second diffusion point is respectively arranged with in the upper and lower surface of diffuser plate by adopting the mode of laser dotting, instead of the mode adopting printing net-point of tradition, make the making of diffuser plate more fast with simple, and light diffusion effect is better.

The above, it is only preferred embodiment of the present utility model, not technical scope of the present utility model is imposed any restrictions, therefore every above embodiment is done according to technical spirit of the present utility model any trickle amendment, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.

Claims

1. a direct LED backlight, is characterized in that: include lower cover, diffuser plate, diffusion barrier, bright enhancement film, light-emitting section and reflectance coating; The periphery of this diffuser plate is butted on the top perimeter of lower cover, the upper and lower surface of diffuser plate is formed with multiple first diffusion point and multiple second diffusion point respectively by laser dotting, the plurality of first diffusion point is distributed in the upper surface of diffuser plate, the plurality of second diffusion point is distributed in the lower surface of diffuser plate, and the volume of the second diffusion point is greater than the volume of the first diffusion point, the distribution density of the second diffusion point is less than the difference density of the first diffusion point; This diffusion barrier is stacked on diffuser plate, and this bright enhancement film is stacked on diffusion barrier; This light-emitting section to be arranged in lower cover and to be positioned at immediately below diffuser plate, and light-emitting section includes substrate and multiple blue LED die, and the plurality of blue LED die is all arranged on substrate, and each blue LED die is all coated with LED lens outward; This reflectance coating covers the internal face with lower cover, and LED lens expose outside reflectance coating; And the bottom surface of this diffuser plate is coated with light modulation layer, the bottom surface of this light modulation layer is coated with quantum dot fluorescence bisque, and the outer surface of these LED lens is coated with filter coating.

2. direct LED backlight according to claim 1, is characterized in that: described LED lens are convex hull shape, and the top of LED lens is arranged with arc caustic surface.

3. direct LED backlight according to claim 1, is characterized in that: described diffuser plate, diffusion barrier and bright enhancement film by press box fixing with under cover.

4. direct LED backlight according to claim 1, is characterized in that: be distributed with multiple support column in described lower cover.

5. direct LED backlight according to claim 1, is characterized in that: described multiple support column is the prism with reflection function.

6. direct LED backlight according to claim 1, is characterized in that: described first diffusion point and the second diffusion point are all in Pyramid.