CN202140931U

CN202140931U - Backlight source, lampshade and light guide plate

Info

Publication number: CN202140931U
Application number: CN201120279954U
Authority: CN
Inventors: 李�瑞; 刘俊国
Original assignee: Beijing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2011-08-03
Filing date: 2011-08-03
Publication date: 2012-02-08
Anticipated expiration: 2021-08-03

Abstract

The utility model relates to the technical field of liquid crystal displaying, in particular to a backlight source, lampshade and light guide plate which are used for improving the phenomenon of nonuniform brightness of local positions in a liquid crystal display image. The backlight source comprises a lampshade with an LED (Light-Emitting Diode) lamp, a light incident opening of a light guide plate, a diffusion film and a prism film, wherein the diffusion film and the prism film are connected with a light emitting opening of the lampshade and are sequentially placed above the light guide plate; a prism lens is also connected between the light emitting opening of the lampshade and the light incident opening of the light guide plate; and the light incident opening of the light guide plate is connected to the prism lens. By using the backlight source, the lampshade and the light guide plate provided by the embodiment of the utility model, the phenomenon of nonuniform brightness of the light incident place of the light guide plate caused by crosswise overlapping of light rays between two LED lamps can be avoided to the greatest extend, therefore, the phenomenon of nonuniform brightness of the local positions in a liquid crystal display image can be improved.

Description

A kind of backlight, lampshade and LGP

Technical field

The utility model relates to technical field of liquid crystal display, relates in particular to a kind of backlight, lampshade and LGP.

Background technology

Comprise the backlight that can send white light in the LCD; The structure of this backlight is as shown in Figure 1; Comprising: provide light source a plurality of LED lamps 11, in rectangle lampshade 12, LGP 13, diffusion barrier 14, the prism film of reflectance coating are arranged, said prism film comprises: following prism film 15 and go up prism film 16; Said LGP 13 links to each other with the light-emitting window of rectangle lampshade 12, and being used for derives LED light to said diffusion barrier 14 and said prism film; The granular sensation that said diffusion barrier 14 is used for LED lamp 11 is produced is eliminated, and reaches the effect that makes backlight send even, soft light; Said prism film 15 down and the said prism film 16 of going up are used to let the light that disperses concentrate on appearance in the normal 70 degree scopes, to increase the brightness of backlight.

The inventor finds, is spot light because LED lamp 11 launches, and its illumination effect is as shown in Figure 2, wherein 21 spot lights launched for LED lamp 11; Because comprise a plurality of LED lamps that keep at a certain distance away in the backlight, the light source that per two adjacent LED lamps are produced necessarily has lap, therefore; The light source that is produced will have the uneven phenomenon of light and shade; Shown in 31 parts among Fig. 3, i.e. the brightness of lap is more intense, and this phenomenon makes the bright dark inequality of LGP light inlet; Therefore, directly cause display frame local location brightness irregularities.

The utility model content

The utility model embodiment provides a kind of backlight and lampshade, is used for improving the phenomenon of the local location brightness irregularities of LCD picture.

A kind of backlight, this backlight comprise lampshade and the LGP that has the LED lamp, are provided with the post lens between the light-emitting window of said lampshade and the light inlet of LGP, and said lampshade light-emitting window links to each other through said post lens with the light inlet of said LGP.

A kind of lampshade, the light-emitting window of said lampshade connect post lens.

A kind of LGP, the light inlet joint pin lens of said LGP.

It is thus clear that; The backlight that adopts the utility model embodiment to provide, when lampshade is prismatic, and the cross section of said lampshade is that right-angled trapezium is; Can be through increasing the propagation distance of light in lampshade itself, reach the purpose that light that each spot light is sent is fully dispersed; And; Light-emitting window through at lampshade is connected post lens with the light inlet place of LGP, makes again behind the light process post lens that lampshade is fully dispersed, and carries out linearity to the LGP incidence surface and assembles; Make light get into LGP as much as possible, improve light utilization efficiency.This project organization also can avoid causing between per two LED lamps because of the direct incident LGP of light the phenomenon of the bright dark inequality of LGP light inlet that the juxtaposition owing to light produces as far as possible, thereby improves the phenomenon of the local location brightness irregularities in the LCD picture.

Description of drawings

Fig. 1 is the structural representation of backlight in the prior art;

Fig. 2 is a LED lamp illumination effect sketch map;

Fig. 3 is two adjacent LED lamp illumination effect sketch mapes;

The back light source structure sketch map that Fig. 4 provides for the utility model embodiment;

The structural representation of the lampshade that Fig. 5 provides for the utility model embodiment;

Another clock back light source structure sketch map that Fig. 6 provides for the utility model embodiment;

The structural representation of the another kind of lampshade that Fig. 7 provides for the utility model embodiment;

The structural representation of the LGP that Fig. 8 provides for the utility model embodiment.

The specific embodiment

The utility model embodiment provides a kind of backlight, and when lampshade is prismatic, and the cross section of said lampshade is that right-angled trapezium is, can be through increasing the propagation distance of light in lampshade itself, reach the purpose that light that each spot light is sent is fully dispersed; And; Light-emitting window through at lampshade is connected post lens with the light inlet place of LGP, makes again behind the light process post lens that lampshade is fully dispersed, and carries out linearity to the LGP incidence surface and assembles; Make light get into LGP as much as possible, improve light utilization efficiency.This project organization also can avoid causing between per two LED lamps because of the direct incident LGP of light the phenomenon of the bright dark inequality of LGP light inlet that the juxtaposition owing to light produces as far as possible, thereby improves the phenomenon of the local location brightness irregularities in the LCD picture.The concrete structure of this backlight is as shown in Figure 4, comprising:

In the lampshade 41 of reflectance coating is arranged; Said lampshade 41 is a cuboid; And a plurality of LED lamps 11 that keep at a certain distance away are placed in one of them side; The light-emitting window of said lampshade 41 is relative with said LED lamp 11, is connected post lens 43 between the light inlet of the light-emitting window of said lampshade 41 and said LGP 13; The top of said LGP 13 also is placed with diffusion barrier 14, following prism film 15 and goes up prism film 16;

As shown in Figure 5, the bottom surface of said lampshade 41 has a light-emitting window, and this light-emitting window links to each other with post lens 43; Preferable, the height of this light-emitting window should be identical with the height of said post lens 43, exposes to prevent light;

Concrete, needing distance to a declared goal at interval between said post lens 43 and the said LED lamp 11, said distance to a declared goal can make behind the spot light process post lens 43 that the LED lamp sends and can pool together uniformly; Preferable, the distance between said post lens 43 and the said LED lamp 11 is 2cm to 10cm; Preferable, get 4cm or 5cm.

As shown in Figure 6, preferable, said lampshade 41 is prismatic, and the cross section of said lampshade 41 is right-angled trapezium, and light-emitting window is positioned at the bottom surface of this lampshade; The a plurality of LED lamps 11 that keep at a certain distance away are placed on the right angle face of this lampshade; The inclined-plane of said lampshade and the angle of bottom surface are 45 degree.

Because the thinness to LCD has very high requirement in actual production, and have only between LED lamp and post lens and have certain distance, could guarantee that the light that will pass through the post lens pools together uniformly; And the lampshade in backlight is prismatic; And when the cross section of said lampshade is right-angled trapezium; When can arrive the distance of post lens, also can eliminate the LCD overall dimensions unfavorable factor bigger than normal that causes because of backlight is oversize at the light that increase LED lamp sends.

As shown in Figure 7, the utility model embodiment also provides a kind of lampshade, and the light-emitting window of said lampshade connects post lens; Said lampshade is that the cross section is the four prism type of rectangle.

Concrete, the distance between said post lens 43 and the said LED lamp 11 needs to guarantee behind the spot light process post lens 43 that the LED lamp sends, can pool together uniformly; Preferable, the distance between said post lens 43 and the said LED lamp 11 is 2cm to 10cm; Preferable, get 4cm or 5cm.

As shown in Figure 5, said lampshade 41 is prismatic, and the cross section is right-angled trapezium, and light-emitting window is positioned at the bottom surface of said lampshade; This light-emitting window links to each other with post lens 43; Preferable, the height of this light-emitting window should be identical with the height of said post lens 43, exposes to prevent light;

The inclined-plane of said lampshade and bottom surface angle are 45 degree.

Between LED lamp and post lens, there is certain distance, could guarantees that the light that will pass through the post lens pools together uniformly; And when this lampshade is prismatic, and the cross section is when being right-angled trapezium, can when increasing light that the LED lamp sent and arriving the distance of post lens, also can reduce the shortcoming that increases because of the LCD apparent size that uses this lampshade to cause.

As shown in Figure 8, the utility model embodiment also provides a kind of LGP, the light inlet joint pin lens 43 of said LGP 13.

In sum, the utility model beneficial effect:

Lampshade in backlight or lampshade are prismatic, and the cross section is when being right-angled trapezium, can when increasing light that the LED lamp sent and arriving the distance of post lens, also can reduce the increase of the apparent size of LCD; When bright dipping place of lampshade in the backlight or lampshade connects post lens, can guarantee that light convergence uniformly behind process post lens gets into LGP for line source, thereby increase the light source utilization rate; The backlight that the utility model embodiment provides has been installed in LCD; Can save in the LGP development process through constantly regulating the bottom surface of light guide plate pattern; Thereby prevent the loaded down with trivial details link of LGP incident side brightness disproportionation phenomenon; Greatly improve the picture quality of LCD, reduced development cost.

Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.

Claims

1. backlight; This backlight comprises lampshade and the LGP that has the LED lamp; It is characterized in that, be provided with the post lens between the light-emitting window of said lampshade and the light inlet of LGP, said lampshade light-emitting window links to each other through said post lens with the light inlet of said LGP.

2. backlight as claimed in claim 1 is characterized in that, said lampshade is a cuboid.

3. backlight as claimed in claim 2 is characterized in that, the distance between LED lamp in the said lampshade and the said post lens is 2 centimetres to 10 centimetres.

4. backlight as claimed in claim 1 is characterized in that, said lampshade is prismatic, and the cross section of said lampshade is right-angled trapezium, and the light-emitting window of said lampshade is positioned at the bottom surface of said lampshade.

5. backlight as claimed in claim 4 is characterized in that, the inclined-plane of said lampshade and the angle of bottom surface are 45 degree.

6. lampshade, said lampshade has the LED lamp, it is characterized in that the light-emitting window joint pin lens of said lampshade.

7. lampshade as claimed in claim 6 is characterized in that, said lampshade is a cuboid.

8. lampshade as claimed in claim 7 is characterized in that, the distance between LED lamp in the said lampshade and the said post lens is 2 centimetres to 10 centimetres.

9. lampshade as claimed in claim 6 is characterized in that, said lampshade is that the cross section is the prismatic of right-angled trapezium, and the light-emitting window of said lampshade is positioned at the bottom surface of said lampshade.

10. lampshade as claimed in claim 9 is characterized in that, the inclined-plane of said lampshade and the angle of bottom surface are 45 degree.

11. a LGP is characterized in that, the light inlet place joint pin lens of said LGP.