CN103644488A

CN103644488A - Backlight module

Info

Publication number: CN103644488A
Application number: CN201310748489.6A
Authority: CN
Inventors: 林明枢
Original assignee: DONGGUAN YAXING SEMICONDUCTOR Co Ltd
Current assignee: DONGGUAN YAXING SEMICONDUCTOR Co Ltd
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2014-03-19
Anticipated expiration: 2033-12-31
Also published as: CN103644488B

Abstract

The invention relates to the technical field of liquid crystal display screens, and in particular relates to a backlight module. The backlight module comprises a light source, a light guide plate, a diffusion sheet and a prism sheet, wherein the diffusion sheet and the prism sheet are sequentially arranged outside an emergent light surface of the light guide plate, the prism sheet is provided with multiple convex ribs which are arranged in parallel, the convex ribs comprise multiple first convex rib sections and multiple second convex rib sections, the first convex rib sections and the second convex rib sections are arranged in a staggered manner, and included angles between the adjacent first convex rib sections and second convex rib sections are 30 degrees to 90 degrees. According to the backlight module, the prism sheet are provided with first prism sections and second prism sections which are intersected, so that the prism sheet has the focusing effect in two directions; the divergence angle of light is reduced, and the utilization rate of light rays is improved; the backlight module is simple in structure, and low in cost.

Description

A kind of backlight module

Technical field

The present invention relates to LCDs technical field, relate in particular to a kind of backlight module.

Background technology

Along with social development, the development of LCDs is very fast also; Liquid crystal display in LCDs is not luminous, but provide light source by backlight module, LCDs constantly develops to energy saving direction in evolution, yet the improved possibility of LCDs is very little, therefore on backlight module, improve, there are many energy-saving LCDs in existing market, as the LCDs of LED light source.But the lighting angle of these LCDs is all larger, thereby the waste of light and the waste of electric energy have been caused.In order to reduce the dispersion angle of light, improve light utilization, people have adopted prismatic lens; For further, reduce lighting angle, on market, there is the mode of biprism sheet combination, but this mode, the structure relative complex that becomes, cost is also relatively high.

Summary of the invention

The object of the invention is to solve the luminous scattering angle of the backlight module of current existing LCDs larger, a kind of backlight module is provided, the lighting angle of this backlight module is little, and good energy saving property and cost are low.

The technical solution used in the present invention is:

A kind of backlight module, comprise light source, LGP, diffusion sheet and prismatic lens, diffusion sheet, prismatic lens are set in turn in outside the exiting surface of LGP, described prismatic lens is provided with a plurality of fins that be arranged in parallel, described fin comprises a plurality of the first fin sections and a plurality of the second fin section, the first fin section and the second fin section are crisscross arranged, and adjacent the first fin section and the angle between the second fin section are 30 degree to 90 degree.

Further, backlight module also comprises a concentration piece, and concentration piece is the structure of thick, the thin edge in middle part.

Further, the shady face of described LGP is provided with diffusion site, and backlight module also comprises reflector, and reflector is positioned at the shady face of LGP.

Further, described light source is arranged at a side of LGP, and the diffusion site on LGP distributes and reduces gradually to the side away from light source from the side near light source.

Further, described light source is paster LED, is provided with the lens that spot light are converted into area source between described paster LED and LGP.

Further, the incidence surface of described lens is provided with LED accommodating hole, and incidence surface is the curved surface of epirelief, and the exiting surface of lens consists of two protruding curved surfaces; Lens are symmetrical structure.

Further, the side of described LGP is provided with the installing hole for accommodating LED; The bottom surface of installing hole is the curved surface for light scattering.

The beneficial effect that the present invention obtains is: it is that the first crossing prism section and the second prism section are set at prismatic lens that the present invention adopts, and makes prismatic lens have the spotlight effect of both direction; Reduce the dispersion angle of light, improve light utilization; And simple in structure, cost is low.

Accompanying drawing explanation

Fig. 1 is a kind of easy structure schematic diagram of the present invention.

Fig. 2 is a kind of structural representation of prismatic lens.

Fig. 3 is the another kind of structural representation of prismatic lens.

Fig. 4 is the sectional structure schematic diagram of lens.

Fig. 5 is the structural representation of lens.

Reference numeral is:

1---LED 2---lens

3---reflector 4---LGP

5---concentration piece 6---diffusion sheet

7---prismatic lens 71---fin

72---first fin section 73---second fin section

21---accommodating hole 22---incidence surface

23---curved surface.

The specific embodiment

Below in conjunction with accompanying drawing 1, to Fig. 5, and the specific embodiment is described further the present invention.

Embodiment: referring to Fig. 1 to Fig. 5.

A kind of backlight module, comprise light source, LGP 4, diffusion sheet 6 and prismatic lens 7, diffusion sheet 6, prismatic lens 7 are set in turn in outside the exiting surface of LGP 4, described prismatic lens 7 is provided with a plurality of fins that be arranged in parallel 71, described fin 71 comprises a plurality of the first fin sections 72 and a plurality of the second fin section 73, the first fin section 72 and the second fin section 73 are crisscross arranged, and adjacent the first fin section 72 and the angle between the second fin section 73 are 30 degree to 90 degree.

The fin of prismatic lens 7 71 is set to wavy, by a plurality of the first fin sections 72 that are crisscross arranged and the second fin section 73, formed, the first fin section 72 and the second fin section 73 are collected processing to light respectively, thereby reach preferably the angle of adjusting LCDs emergent ray.

When the first fin section 72 and the second fin section 73 are 90 degree angle (as shown in Figure 2), the first fin section 72 is vertical with the second fin section 73; In fin 71 integral body on prismatic lens 7, be by horizontal fin and longitudinally fin form, therefore can carry out angle adjustment to the light of both direction (horizontal and vertical).

Further, backlight module also comprises a concentration piece 5, and concentration piece 5 is the structure of thick, the thin edge in middle part.

By concentration piece 5 is set, the lighting angle of minimizing backlight module further.When backlight module is carried out to optically focused, generally only need the light of edge to carry out angle adjustment, so the interior thickness of concentration piece 5 remain unchanged, the thickness at edge reduces gradually.As middle part is round pie or cuboid structure, the cross section at edge is trapezoidal.

Further, the shady face of described LGP 4 is provided with diffusion site, and backlight module also comprises reflector 3, and reflector 3 is positioned at the shady face of LGP 4.

Diffusion site is set, makes light more even in the interior distribution of LGP 4, avoid the emergent ray skewness of LGP 4, cause display panels to have light and shade district.Secondly the shady face at LGP 4 arranges luminous plaque, can improve light utilization.

Further, described light source is arranged at a side of LGP 4, and the diffusion site on LGP 4 distributes and reduces gradually to the side away from light source from the side near light source.

What at present a lot of LCDs were all done is very thin, and light source is arranged to thin that a side of LGP 4 can make LCDs; And so just can make light, in LGP 4, be uni-directional diffusion; In the side near light source, its illuminance is greater than the side away from light source; So in design diffusion site, that designs in the place near light source is more, that away from the place of light source, designs is few.Reach the uniform effect of light.

Further, described light source is paster LED 1.

Wherein, between described paster LED 1 and LGP 4, be provided with lens 2.

Adopt LED1 lamp as light source, can save further electric energy; Because LED1 is spot light, when projecting LGP 4, there will be skewness.Therefore its with LGP 4 between lens 2 are set, assist spot light become to area source, lens 2 can be concavees lens or convex lens.

As equivalents, the side of described LGP 4 is provided with the installing hole for accommodating LED1; The bottom surface of installing hole is the curved surface for light scattering.

Adopt curved surface or the dispersing lens 2 of scattering, all can reach the effect of area source.Next adopts the mode of installing hole, and minimizing light leak that can be further improves light utilization efficiency.

Further, the incidence surface 22 of described lens is provided with LED accommodating hole 21, and incidence surface 22 is the curved surface of epirelief, and the exiting surface of lens consists of two protruding curved surfaces 23; Lens 2 are symmetrical structure.

Because LED is spot light, and rectangular shaped light source is symmetrical light sources, so lens 2 are symmetrical structure.In design process, should be by the intermediate light powerization of spot light, thereby adopted exiting surface, be both sides projections, middle recessed structure.

Below be only the application's preferred embodiment, equivalent technical solutions on this basis still falls into application protection domain.

Claims

1. a backlight module, comprise light source, LGP, diffusion sheet and prismatic lens, diffusion sheet, prismatic lens are set in turn in outside the exiting surface of LGP, described prismatic lens is provided with a plurality of fins that be arranged in parallel, it is characterized in that: described fin comprises a plurality of the first fin sections and a plurality of the second fin section, the first fin section and the second fin section are crisscross arranged, and adjacent the first fin section and the angle between the second fin section are 30 degree to 90 degree.

2. backlight module according to claim 1, is characterized in that: backlight module also comprises a concentration piece, and concentration piece is the structure of thick, the thin edge in middle part.

3. backlight module according to claim 1, is characterized in that: the shady face of described LGP is provided with diffusion site, and backlight module also comprises reflector, and reflector is positioned at the shady face of LGP.

4. backlight module according to claim 3, is characterized in that: described light source is arranged at a side of LGP, and the diffusion site on LGP distributes and reduces gradually to the side away from light source from the side near light source.

5. backlight module according to claim 1, is characterized in that: described light source is paster LED, is provided with the lens that spot light are converted into area source between described paster LED and LGP.

6. backlight module according to claim 5, is characterized in that: the incidence surface of described lens is provided with LED accommodating hole, and incidence surface is the curved surface of epirelief, and the exiting surface of lens consists of two protruding curved surfaces; Lens are symmetrical structure.

7. backlight module according to claim 1, is characterized in that: the side of described LGP is provided with the installing hole for accommodating LED; The bottom surface of installing hole is the curved surface for light scattering.