CN102116454A

CN102116454A - Light guide plate and backlight module using same

Info

Publication number: CN102116454A
Application number: CN2009103129174A
Authority: CN
Inventors: 吴锡章; 林大为
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2009-12-31
Filing date: 2009-12-31
Publication date: 2011-07-06

Abstract

The invention provides a light guide plate, which comprises a first surface and a second surface mutually back to each other. The first surface comprises a plurality of first salients; the plurality of first salients are evenly arranged on the first surface in a matrix form; the second surface comprises a plurality of second salients; the plurality of second salients are unevenly arranged on the second surface; the cross sectional area of the first salient is larger than that of the second salient; moreover, the density of the first salient is smaller than that of the second salient. Therefore, beams after being refracted and diffused by the first surface form an area source and are shot at the second surface; and the area source after being retracted and diffused by the second surface again is exited; therefore, the uniformity of the area source of the light guide plate is higher; and then the backlight module adopting the light guide plate does not need to be provided with a diffuser film; therefore, the structure of the backlight module is simplified. The invention also provides a backlight module adopting the light guide plate.

Description

LGP and adopt the module backlight of this LGP

Technical field

The present invention relates to a kind of LGP and a kind of module backlight that adopts this LGP.

Background technology

At present, can make the LGP of module backlight by ejection formation (Injection Molding) technology.The die of the mould of formed light conductive plate generally comprises a smooth surface and a patterned surfaces that utilizes radium-shine process technology to be formed with relief pattern.Accordingly, the LGP of moulding has a smooth surface and a patterned surfaces.Patterned surfaces is used for refraction, diffusion light linear light sorurce is converted to an area source.This area source is penetrated by this smooth surface.

Radium-shine process technology general using laser pointwise illumination die is to produce a plurality of guiding principle points trickle, depression on die.Yet, the laser irradiation is melt into slag (being commonly called as the volcanic crater phenomenon) by high-octane laser around might causing guiding principle point, make the patterned surfaces of LGP of moulding except having corresponding relief pattern, also form coarse burr around each guiding principle point, thereby make that the light uniformity of patterned surfaces refraction is not high, and then cause the uniformity of area source of LGP outgoing not high.For this reason, present module backlight also need increase a diffusion sheet except that LGP.Yet the employing of diffusion sheet causes the complex structure of module backlight

Summary of the invention

In view of this, being necessary to provide a kind of is applied in the module backlight and can makes the simpler LGP of structure of module backlight and adopt the module backlight of this LGP.

A kind of LGP, it comprise mutually back to a first surface and a second surface.This first surface comprises a plurality of first projectioies, and these a plurality of first projectioies are matrix form and are evenly distributed on this first surface.This second surface comprises a plurality of second projectioies, and these a plurality of second projectioies anisotropically are distributed on this second surface.The cross-sectional area of first projection is bigger and density is littler than the density of second projection than the cross-sectional area of second projection.

A kind of module backlight, it comprises a light source cell, a reflector plate, a prismatic lens and a LGP; This LGP comprise mutually back to a first surface and a second surface.This first surface comprises a plurality of first projectioies, and these a plurality of first projectioies are matrix form and are evenly distributed on this first surface.This second surface comprises a plurality of second projectioies, and these a plurality of second projectioies anisotropically are distributed on this second surface.The cross-sectional area of first projection is bigger and density is littler than the density of second projection than the cross-sectional area of second projection.This reflector plate, prismatic lens and LGP are arranged at the same side of light source cell, and this reflector plate is towards this first surface, and this prismatic lens is towards this second surface.

LGP of the present invention back to two surfaces be provided with a plurality of projectioies, thus, light forms an area source and directive second surface through refraction, the diffusion back of first surface, the outgoing after the refraction again of this second surface, diffusion of this area source is gone out, thereby make that the uniformity of area source of this LGP outgoing is higher, and then, adopt the module backlight of this LGP that a diffusion sheet needn't be set again, simplified the structure of module backlight.

Description of drawings

Fig. 1 is the structural representation of the LGP of better embodiment of the present invention.

Fig. 2 is the structural representation of another angle of LGP of Fig. 1.

Fig. 3 is the schematic cross-section of the LGP IV-IV along the line of Fig. 1.

Fig. 4 is the module schematic diagram backlight of the LGP of employing Fig. 1.

The main element symbol description

LGP	10
		First surface	100
First projection	102
		Second surface	200
Second projection	202
		Module backlight	30
Light source cell	302
		Reflector plate	304
Prismatic lens	306
		Light source	308
Reflector	310
		Reflecting surface	312
The plane	314
		Prism facets	316
Groove	318
		Side	320

The specific embodiment

Please refer to Fig. 1 to Fig. 3, the LGP 10 of better embodiment of the present invention comprise mutually back to a first surface 100 and a second surface 200.First surface 100 comprises a plurality of equally distributed first projectioies 102 of matrix form that are, and second surface 200 comprises second projection 202 of a plurality of uneven distributions.The cross-sectional area of first projection 102 is bigger and density is littler than the density of second projection 202 than the cross-sectional area of second projection 202.Make the granular sensation of the projection 102 of winning stronger than the granular sensation of second projection 202.Therefore, second surface 200 atomizes more than first surface 100.

When a light source is arranged on LGP 10 perpendicular to the side of first surface 100 or second surface 200 on the time, light enters LGP 10 by this side, because the cross-sectional area of first projection 102 is bigger, the brightness of the light that each first projection 102 is reflected is also stronger, therefore, the briliancy of the light that 102 refractions of the projection of first on the first surface 100 are gone out is bigger, thereby has promoted the briliancy of LGP 10.Light distributes because first projection 102 is matrix form after first surface 100 is refracted away, and the area source that the light that 102 refractions of each first projection are gone out is formed is also more even.

Because big, the less and uneven distribution of rank street area of 202 density of second projection, light by first surface 100 be refracted form area source and arrive second surface 200 after, on second projection 202, reflect again, thereby make by the uniformity of the area source of second surface 200 outgoing higher.

Please refer to Fig. 4, the present invention also provides a kind of module backlight 30 that adopts described LGP 10.Module 30 backlight comprises a light source cell 302, reflector plate 304, a LGP 10 and a prismatic lens 306.Reflector plate 304, LGP 10 and prismatic lens 306 are arranged at the same side of light source cell 302.Reflector plate 304 is towards first surface 100, and prismatic lens 306 is towards second surface 200.

Particularly, light source cell 302 comprises a light source 308 (as CCFL) and a reflector 310.Reflector plate 304 is rectangular-shaped, and it comprises a reflecting surface 312, is coated with on the reflecting surface 312 with high reflecting material, as white PET (Polyethylene Terephthalate, polyethylene terephthalate).Prismatic lens 306 is rectangular-shaped, it comprise mutually back to a plane 314 and a prism facets 316, offer a plurality of grooves 318 on the prism facets 316, groove 318 is made up of the side 320 at two parallel edge minute surface 316 edges, and two 320 of sides close in an angle.Reflector 310 is arranged at a side of light source 308, and LGP 10 is arranged at the opposite side of light source 308, and the reflecting surface 312 of reflector plate 304 is towards first surface 100, and the plane 314 of prismatic lens 306 is towards second surface 200.The light that penetrates from light source 308 is refracted to second surface 200 by first projection 102 after shining on first projection 102 on the first surface 100.This moment, light became more even.Light reflect again through second projection 202 again, and outgoing is to prismatic lens 306 at second surface 200 places.Light becomes more even through after reflecting for the second time.Simultaneously, from be reflected sheet 304 reflections and returning the LGP 10 of the light of first surface 100 outgoing, above-mentioned refracting process takes place again after outgoing to prismatic lens 306.At last, on the second surface 200 of LGP 10, form a uniform surface light source, and penetrate by prism facets 316.Prismatic lens 306 is used to promote the briliancy of area source.The use of LGP 10 makes and a diffusion sheet needn't be set in the module 30 backlight again, simplified the structure of module 30 backlight.

The shape that is appreciated that LGP 10 is not limited to present embodiment.As, also LGP can be arranged to wedge (figure do not show), on it two relative but uneven surface also is respectively arranged with above-mentioned first projection, 102 and second projection 202.

Those skilled in the art will be appreciated that; above embodiment only is to be used for illustrating the present invention; and be not to be used as limitation of the invention; as long as within connotation scope of the present invention, appropriate change and the variation that above embodiment did all dropped within the scope of protection of present invention.

Claims

1. LGP, it comprise mutually back to a first surface and a second surface, this first surface comprises a plurality of first projectioies, it is characterized in that: these a plurality of first projectioies are matrix form and are evenly distributed on this first surface; This second surface comprises a plurality of second projectioies, and these a plurality of second projectioies anisotropically are distributed on this second surface; The cross-sectional area of first projection is bigger and density is littler than the density of second projection than the cross-sectional area of second projection.

2. LGP as claimed in claim 1 is characterized in that this LGP is rectangular-shaped.

3. LGP as claimed in claim 1 is characterized in that this LGP is wedge, and this first surface and second surface are respectively two relative and uneven surfaces.

A module backlight it comprise that a light source cell, reflector plate, prismatic lens and one are as each described LGP of claim 1-3 item; This reflector plate, prismatic lens and LGP are arranged at the same side of light source cell, and this reflector plate is towards this first surface, and this prismatic lens is towards this second surface.