CN202266945U

CN202266945U - Side-light type backlight module

Info

Publication number: CN202266945U
Application number: CN2011204149411U
Authority: CN
Inventors: 张威; 王江波
Original assignee: HC Semitek Corp
Current assignee: HC Semitek Corp
Priority date: 2011-10-27
Filing date: 2011-10-27
Publication date: 2012-06-06
Anticipated expiration: 2021-10-27

Abstract

The utility model discloses a side-light type backlight module, comprising an LED (Light-Emitting Diode) light source and a light guide plate, wherein the light guide plate is provided with an arc-shaped light inlet and a bottom surface gradual change micro prism structure. The LED light source comprises an LED light source array module which is formed by the way that LED light beads or SMD (Surface Mounted Device) LEDs in various colour temperatures are welded on a PCB (Printed Circuit Board) aluminum rod at equal intervals. The side-light type backlight module disclosed by the utility model has the advantages that incident angle of an LED can be expanded, the phenomenon that an end face is nonuniform is reduced, and light ray coupling efficiency of the light guide plate is also increased, the structure can be applied to the backlight module of a flat panel display and also can be applied to the field of LED flat panel lighting; besides, an inclined micro prism structure is additionally arranged on the bottom surface of the light guide plate, brightness of an emergent light is further improved on the basis of degree of uniformity, application amount of an optical thin-film is reduced, cost is reduced, and the structure also can be applied to a backlight structure taking a cold cathode fluorescent lamp (CCFL) as an incident light source.

Description

Side-light type module backlight

Technical field

The utility model relates to LCD backlight device and relevant plate lighting field, particularly a kind of low cost, high efficiency, the module backlight that the side incident type of high stability is backlight and illuminating device is required.

Background technology

LGP is the vitals that in the side light-in backlight incident light is converted into uniform area light source.Be applied in the various flat panel display equipments,, guarantee that it can operate as normal for display floater provides the area source of high evenness.Diode (LED) is as a kind of energy-efficient novel light-emitting device, compares with conventional light source to have multiple advantage and be widely used at various lighting fields.Have huge advantage with respect to traditional CCFL backlight in many-side as the LED-backlit source module of light source by LED: the reaction time generally reaches microsecond level, all solid state luminous durable in use, energy-conserving and environment-protective, and colour gamut reaches more than 90%, ultra-thin light etc.Present increasing backlight uses LED as light source.

What come into operation at present mainly receives the influence of aspects such as lamp bar arrangement mode, light conducting plate structure, radiating mode with LED as the light efficiency of the side incident type backing structure of light source and stability.Fig. 1 is light source and the light conducting plate structure figure in the side light type LED back light source of main flow in the market; LED lamp bar 1 as incident light source mainly is to adopt monolateral lamp bar and bilateral lamp bar structure; Its core component LGP mainly is to adopt polymethyl methacrylate (PMMA) as raw material, is using the site that scattering process is arranged on the ink printing that contains scattering particles on the sheet material bottom surface 4 of injection formed or is using laser to carry out the engraving of site then.Also can lattice point structure be made mould, LGP is carried out single injection-molded.As shown in Figure 1; The light that LED1 sends is injected from the porch, plane 2 of LGP; Light is propagated in LGP inside, and through the printing net-point with scattering process or the nonplanar structure site of LGP lower surface 4, its original round changes; Change the light of back in the total reflection angle and penetrate LGP through refraction action, form area source through LGP upper surface 3.On certain dimension scale, can be considered spot light owing to single led; When using led array as light source, light penetrates from a plurality of LED, and light is propagated in LGP; The LED lighting angle is limited; Therefore between two LED, the incident intensity in certain distance a little less than, on the LGP surface, form inhomogeneous.In actual the use, be to improve brightness, the light that penetrates from LGP need pass through the optical thin film that one deck has diffusion, and one to two-layer through changing the brightening piece that lighting angle improves brightness, could finally reach the requirement of backlight of LCD.

From on can find to have certain defective the existing LED-backlit structure: one, LED is as a kind of Lambertian source that on a dimensioning, can regard spot light as; Increase brightness with lighting angle reduces gradually from the center in lighting angle for it; Therefore when using led array; Can there be relative dark space between two LEDs; Cause the LGP incident side ' firefly ' phenomenon that replaces with the corresponding light and shade of led array to occur, solve through increasing masked area or bottom reflection area usually, but this has just reduced service efficiency.Two, reach brightness requirement; The light that penetrates in the LGP need pass through the modulation of multilayer optical film, is not only structure complicated like this, in post production process, has increased destabilizing factor; Because the optical thin film price of an enhanced shine is higher, make that also ultimate cost is higher in addition.

Summary of the invention

The purpose of the utility model is to provide a kind of low cost, high optical efficiency and high stability to be applied to the light conducting plate structure of side light-in backlight.

The technical scheme of the utility model is: a kind of side-light type module backlight, and this module comprises led light source and LGP, LGP has arc light inlet and the little rib structure of bottom surface gradual change.Led light source comprises equidistantly being welded on by the LED lamp pearl of each colour temperature or adopting surface mounted LED and forms the led light source array module on the PCB aluminum strip.Separation fixing hole on the PCB aluminum strip is installed the PCB aluminum strip according to the position of module aluminium sash backlight side screw socket is corresponding, the thermal conductive silicon adhesive tape is placed at the screw socket interval, uses nut fixedly PCB aluminum strip and aluminium sash.The arc light inlet is over against the curved-surface structure of led light source and is attached to microtrabeculae shape structure on the curved surface.The curved-surface structure of incidence surface is cave inward circular-arc, vertically through the exiting surface of LGP and over against the bottom surface, its central point is positioned at the front side of preparatory placement light source point, its quantity is identical with LED quantity.Be attached to microtrabeculae shape structure on the curved surface perpendicular to the exiting surface bottom surface corresponding with it, little rib is in outwards outstanding triangle or circular arc and other shapes that can associate of being shaped as that is parallel on the horizontal tangent plane of exiting surface.Gradual change little rib structure in bottom surface is attached to the bottom surface of light guide plate corresponding with going out optical plane, is parallel to into optical plane, through whole bottom surface of light guide plate.Gradual change little rib construction unit in bottom surface is the little rib of strip, and the ratio that the little rib of single strip accounts for whole base area is consistent, or with increasing gradually away from incidence surface.The little rib of said single strip is perpendicular to the oblique triangle that is shaped as on the tangent plane of the exiting surface lower surface corresponding with it.The oblique triangle tangent plane near the angle of the hypotenuse of incident side and its attaching surface less than another hypotenuse and attaching surface angle.

The advantage of the utility model is: with respect to light conducting plate structure in the market; It is handled and additional little rib structure through carry out cambered surface at incident side led light source correspondence position, can not only enlarge the LED incident angle, lowers the end face non-uniform phenomenon; Also increase simultaneously the light coupling efficiency of LGP; This kind structure not only can be applicable to the module backlight of flat-panel monitor, also can be used for LED plate lighting field, in addition through the additional oblique little rib structure of bottom surface of light guide plate morning; Further improve emergent light brightness on the basis of the uniformity; Reduce the use amount of optical thin film, reduce cost, it is in the backing structure of incident light source that this structure also can be used for cold cathode fluorescent tube (CCFL).

Description of drawings

Fig. 1 is in the market with the backing structure figure of LED as incident light source;

Fig. 2 is the external overall structure chart of this patent embodiment;

Fig. 3 is the light inlet end face structure chart of this patent embodiment;

Fig. 4 is the view in transverse section of the light inlet end face of this patent embodiment;

Fig. 5 is the bottom surface partial structurtes figure of this patent embodiment;

Fig. 6 is the bottom surface partial vertical sectional view of this patent embodiment.

The specific embodiment

Description is described according to LED-backlit module of the present invention and light conducting plate structure

Shown in the external overall structure chart of Fig. 2 this patent embodiment, it comprises LED lamp bar 1 and LGP, and wherein LGP comprises incidence surface 2, exiting surface 3 and corresponding bottom surface 4 thereof.Exiting surface is a plurality of emitting led over against light source, and receives the light that LED sends; Like Fig. 3; The position of 4 corresponding each the LED lamp on the incidence surface that are shown in is provided with the curved-surface structure 5 of lateral cross section (plane that is parallel to exiting surface) for the circular arc type that caves inward; This curved-surface structure 5 vertically through exiting surfaces 3 of LGP and over against bottom surface 4 and up and down radian equate; The quantity setting of this curved surface is identical with LED quantity, and the LED center is departed from the center of each curved surface, and the size of this curved surface radian is confirmed according to light-emitting area and the lighting angle of use LED; The angle that whole curved surface sends LED according to the toroidal lens principle light further enlarges when getting into LGP, reduces the unevenness of LGP fringe region.Simultaneously according to optically-coupled principle additional little rib structure 6 on arc-shaped curved surface; This little rib structure 6 is attached to above-mentioned curved-surface structure 5 surfaces; Perpendicular to exiting surface 3 bottom surface 4 corresponding with it, little edge element 7 is in the outwards outstanding triangle or the circular arc of caving in of being shaped as that is parallel on the horizontal tangent plane of exiting surface.LGP improves light efficiency to the coupling area of light when increasing light that LED sends like this and arriving LGP.

Like Fig. 5,6 is present embodiment bottom surface partial structurtes figure and plumb cut figure; This little rib structure 8 is attached on the bottom surface of light guide plate 4 relative with exiting surface; Be parallel to into optical plane 2, single strip prism accounts for the ratio of whole base area with increasing away from incidence surface.Little rib construction unit 9 is perpendicular to the oblique triangle that is shaped as on the tangent plane of the exiting surface lower surface corresponding with it, this oblique triangle near the angle of the hypotenuse of incident side and its attaching surface be approximately another hypotenuse and attaching surface angle β 2-3 doubly.Because the destruction of 8 pairs of light paths of the little rib in bottom surface and converge the original intensity that interaction energy promotes LGP light output surface 3.This structure is equally applicable to backing structure and the side incident type flat lamp of cold cathode fluorescent tube as light source simultaneously.

Module backlight in the foregoing description and light conducting plate structure not only can reduce the non-uniform phenomenon of LGP light inlet end face through little rib structure of carrying out curved surface processing and bottom surface at the LGP incidence surface; Simultaneously can improve the light coupling efficiency, increase beam projecting brightness.

At last, it is also to be noted that above listed examples only is in order to specific embodiments of the present invention to be described but not limits it.Obviously, the present invention is not limited only to above embodiment, and many distortion can also be arranged.Those skilled in the art can from the invention content directly derive or associate all distortion, all should think protection scope of the present invention.

Claims

1. side-light type module backlight, it is characterized in that: this module comprises led light source and LGP, LGP has arc light inlet and the little rib structure of bottom surface gradual change.

2. according to the said side-light type of claim 1 module backlight, it is characterized in that: led light source comprises equidistantly being welded on by the LED lamp pearl of each colour temperature or adopting surface mounted LED and forms the led light source array module on the PCB aluminum strip.

3. according to the said led light source array module of claim 2; It is characterized in that: separation fixing hole on the PCB aluminum strip; The PCB aluminum strip is installed according to the position of module aluminium sash backlight side screw socket is corresponding, and the thermal conductive silicon adhesive tape is placed at the screw socket interval, uses nut fixedly PCB aluminum strip and aluminium sash.

4. according to the said side-light type of claim 1 module backlight, it is characterized in that: the arc light inlet is over against the curved-surface structure of led light source and is attached to microtrabeculae shape structure on the curved surface.

5. according to the said side-light type of claim 4 module backlight; It is characterized in that: the curved-surface structure of incidence surface is cave inward circular-arc; Vertically through the exiting surface of LGP and over against the bottom surface, its central point is positioned at the front side of preparatory placement light source point, its quantity is identical with LED quantity.

6. according to the said side-light type of claim 4 module backlight; It is characterized in that: be attached to microtrabeculae shape structure on the curved surface perpendicular to the exiting surface bottom surface corresponding with it, little rib is in outwards outstanding triangle or the circular arc of being shaped as that is parallel on the horizontal tangent plane of exiting surface.

7. according to the said side-light type of claim 1 module backlight, it is characterized in that: gradual change little rib structure in bottom surface is attached to the bottom surface of light guide plate corresponding with going out optical plane, is parallel to into optical plane, through whole bottom surface of light guide plate.

8. according to the said side-light type of claim 1 module backlight, it is characterized in that: gradual change little rib construction unit in bottom surface is the little rib of strip, and the ratio that the little rib of single strip accounts for whole base area is consistent, or with increasing gradually away from incidence surface.

9. said according to Claim 8 side-light type module backlight is characterized in that: the little rib of said single strip is perpendicular to the oblique triangle that is shaped as on the tangent plane of the exiting surface lower surface corresponding with it.

10. said according to Claim 8 side-light type module backlight is characterized in that: the oblique triangle tangent plane near the angle of the hypotenuse of incident side and its attaching surface less than another hypotenuse and attaching surface angle.