CN103791323A

CN103791323A - Backlight module

Info

Publication number: CN103791323A
Application number: CN201310748651.4A
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: 2014-05-14

Abstract

The invention relates to the technical field of liquid crystal displays, in particular to a backlight module comprising a light guide plate and an aluminum substrate disposed on one side of the light guide plate. The aluminum substrate is provided with a plurality of LEDs. The backlight module further comprises a reflecting plate. The reflecting plate has an arc surface which projects light in a rectangular manner. The light emitted from the LEDs is reflected by the reflecting plate and projected to the light guide plate. The light is scattered, a point light source is expanded into a rectangular area light source, and a plurality of rectangular area light sources are stacked into a large area light source. Therefore, light can evenly enter the light guide plate.

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

Universal along with electronic product, the especially use of smart mobile phone, what make that LCDs uses is more and more; LCDs is in the evolution of following smart mobile phone, gradually to thin future development; And the future development of power saving more; LCDs is mainly made up of LCD panel and backlight module, and the improvement possibility of LCD panel is smaller; Therefore mainly on backlight module, improve; Backlight module from before straight-down negative change to present side-light type; Light source also from before cathode fluorescent tube change into present LED; Owing to being side-light type, therefore require the power of LED higher; Secondly, LED is spot light, and in projecting, light is divergence expression; Cause the radiation direction entering in LGP poor; And local shadow is more, the light in LGP is inhomogeneous, and then a little less than the light that causes casting out from LCDs has and have by force, skewness.

Summary of the invention

The object of the invention is to solve the backlight module of current existing LCDs in use, LGP is because the inhomogeneous problem of the inhomogeneous emergent ray causing of incident ray, a kind of backlight module is provided, and the incident ray of this backlight module is even, and the light projecting is also comparatively even.

The technical solution used in the present invention is:

A kind of backlight module, comprises LGP and is arranged on the aluminium base of LGP one side; On aluminium base, be provided with plurality of LEDs; Also comprise reflector, described reflector is provided with the arcwall face that light is projected away with rectangular mode; The light that LED sends projects LGP after reflector reflection.

The ray cast that the technical program is sent LED by reflector, to LGP, becomes area source by spot light; Thereby make light evenly enter LGP.

Further, described reflector is provided with the salient point for light diffusion.

A kind of backlight module, comprises LGP and is arranged on the aluminium base of LGP one side, is provided with plurality of LEDs on aluminium base; Between described LED and LGP, be provided with the lens that light is projected away with rectangular mode.

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 is made up of two protruding curved surfaces; Lens are symmetrical structure.

Further, the shady face of described LGP is inclined to set, and shady face is provided with multiple reflections site.

Further, the exiting surface of LGP is provided with diffusion sheet, prismatic lens successively.

Wherein, the exiting surface of described diffusion sheet is provided with many parallel raised lines, and the exiting surface of described prismatic lens is also provided with many parallel raised lines, and angle between the extending direction of raised line on raised line extending direction and prismatic lens on diffusion sheet is 75 to 90 degree.

Wherein, described prismatic lens is provided with multiple fins that be arranged in parallel, described fin comprises multiple the first fin sections and multiple the second fin section, and the first fin section and the second fin section are crisscross arranged, and the angle between adjacent the first fin section and the second fin section is 30 degree to 90 degree.

The beneficial effect that the present invention obtains is: the present invention adopts the mode of light source diffusion, spot light is diffused as to the area source of rectangle, and forms a large area source by the area source stack of multiple rectangles.Make the light inlet of LGP even.

Accompanying drawing explanation

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

Fig. 2 is another kind of structural representation of the present invention.

Fig. 3 is the cross-sectional schematic of the lens in Fig. 2.

Fig. 4 is the schematic diagram of the lens in Fig. 2.

Fig. 5 is the cooperation schematic diagram of diffusion sheet and prismatic lens.

Fig. 6 is the structural representation of prismatic lens.

Fig. 7 is the another kind of structural representation of prismatic lens.

Reference numeral is:

1---LGP 2---diffusion sheet

3---prismatic lens 4---LED

11---reflection site 5---lens

6---reflector 22---first fin section

23---second fin section 21---fin

51---accommodating hole 52---incidence surface

53---curved surface.

The specific embodiment

Below in conjunction with accompanying drawing 1, to Fig. 7, and the specific embodiment is described further the present invention.

Embodiment 1: referring to Fig. 1.

A kind of backlight module, comprises LGP 1 and is arranged on the aluminium base of LGP 1 one sides; On aluminium base, be provided with plurality of LEDs 4; Also comprise reflector 6, described reflector 6 is provided with the arcwall face that light is projected away with rectangular mode; The light that LED4 sends projects LGP 1 after reflector 6 reflections.

The ray cast that the technical program is sent LED4 by reflector 6, to LGP 1, becomes area source by spot light; Thereby make light evenly enter LGP 1.

Further, described reflector 6 is provided with the salient point for light diffusion.

Embodiment 2: referring to Fig. 2 to Fig. 4.

A kind of backlight module, comprises LGP 1 and is arranged on the aluminium base of LGP 1 one sides, is provided with plurality of LEDs 4 on aluminium base; Between described LED4 and LGP 1, be provided with the lens 5 that light is projected away with rectangular mode.

The mode of lens 5 is set, spot light is changed to small-sized area source, simple in structure; Also easily realize.In current non-sym lens 5, existing many methods design projected path by projective structure, and then design the lens 5 of projection.

Further, the incidence surface 52 of described lens 5 is provided with LED4 accommodating hole 51, and incidence surface 52 is the curved surface of epirelief, and the exiting surface of lens 5 is made up of two protruding curved surfaces 53; Lens 5 are symmetrical structure.

Because LED4 is spot light, and rectangular shaped light source is symmetrical light sources, and therefore lens 5 are symmetrical structure.In design process, should, by the intermediate light powerization of spot light, be both sides projection thereby adopted exiting surface, middle recessed structure.

Further, the shady face of described LGP 1 is inclined to set, and shady face is provided with multiple reflections site 11.

Reflection site 11 is set, can makes from LGP 1 light out more even.

Further, the exiting surface of LGP 1 is provided with diffusion sheet 2, prismatic lens 3 successively.

Diffusion sheet 2 is set, light source is further dispersed, increase the uniformity of light.Prismatic lens 3 is set, for controlling the angle of dispersing, avoids dispersion angle excessive, cause light waste.

Referring to Fig. 5, the exiting surface of described diffusion sheet 2 is provided with many parallel raised lines, the exiting surface of described prismatic lens 3 is also provided with many parallel raised lines, and angle between the extending direction of raised line on raised line extending direction and prismatic lens 3 on diffusion sheet 2 is 75 to 90 degree.

On backlight module, using prismatic lens 3 has been the technology of comparatively commonly using, and prismatic lens 3, because its surperficial raised line makes light in the time seeing through prismatic lens 3, can be assembled the light of transmission; Because the surperficial raised line direction of prismatic lens 3 is single, therefore, in the time of optically focused, can only play the optically focused of a direction in plane, as left and right directions; And in another direction, play less effect.Raised line is also set on diffusion sheet 2, and the direction of this raised line is crossing with the raised line direction on prismatic lens 3, thereby can another direction in the plane carries out optically focused.In general, the light that LCDs casts out, wishes little in the diffusion angle of above-below direction; Diffusion angle at horizontal left and right directions is slightly large; Therefore crossing angle can be set according to demand.According to experimental data, think that angle effect between 75 degree to 90 degree is better.Reduce the waste of light, and then can reach the electricity consumption that reduces light source, thereby reach the effect of power saving.

Referring to Fig. 6, Fig. 7, described prismatic lens 2 is provided with multiple fins that be arranged in parallel 21, described fin 21 comprises multiple the first fin sections 22 and multiple the second fin section 23, the first fin section 22 and the second fin section 23 are crisscross arranged, and the angle between adjacent the first fin section 22 and the second fin section 23 is 30 degree to 90 degree.

The fin of prismatic lens 2 21 is set to wavy, formed by multiple the first fin sections 22 that are crisscross arranged and the second fin section 23, the first fin section 22 and the second fin section 23 are collected processing to light respectively, thereby reach preferably the angle of adjusting LCDs emergent ray.

In the time that the first fin section 22 and the second fin section 23 are 90 degree angle (as shown in Figure 2), the first fin section 22 is vertical with the second fin section 23; In fin 21 entirety on prismatic lens 2, be to be formed by horizontal fin and longitudinal fin, therefore can carry out angle adjustment to the light of both direction (horizontal and vertical).

Below be only the application's preferred embodiment, equivalent technical solutions on this basis still falls into application protection domain. [0042]above-mentioned several structures also can be applied to embodiment 1.

Claims

1. a backlight module, comprises LGP and is arranged on the aluminium base of LGP one side; On aluminium base, be provided with plurality of LEDs; It is characterized in that: also comprise reflector, described reflector is provided with the arcwall face that light is projected away with rectangular mode; The light that LED sends projects LGP after reflector reflection.

2. a kind of backlight module according to claim 1, is characterized in that: described reflector is provided with the salient point for light diffusion.

3. a kind of backlight module according to claim 2, is characterized in that: the shady face of described LGP is inclined to set, and shady face is provided with multiple reflections site.

4. according to a kind of backlight module described in claim 1 or 2 or 3, it is characterized in that: the exiting surface of LGP is provided with diffusion sheet, prismatic lens successively.

5. a backlight module, comprises LGP and is arranged on the aluminium base of LGP one side, is provided with plurality of LEDs on aluminium base; It is characterized in that: between described LED and LGP, be provided with the lens that light is projected away with rectangular mode.

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

7. a kind of backlight module according to claim 6, is characterized in that: the shady face of described LGP is inclined to set, and shady face is provided with multiple reflections site.

8. according to a kind of backlight module described in claim 5 or 6 or 7, it is characterized in that: the exiting surface of LGP is provided with diffusion sheet, prismatic lens successively.

9. a kind of backlight module according to claim 8, it is characterized in that: the exiting surface of described diffusion sheet is provided with many parallel raised lines, the exiting surface of described prismatic lens is also provided with many parallel raised lines, and angle between the extending direction of raised line on raised line extending direction and prismatic lens on diffusion sheet is 75 to 90 degree.

10. a kind of backlight module according to claim 8, it is characterized in that: described prismatic lens is provided with multiple fins that be arranged in parallel, described fin comprises multiple the first fin sections and multiple the second fin section, the first fin section and the second fin section are crisscross arranged, and the angle between adjacent the first fin section and the second fin section is 30 degree to 90 degree.