CN102506361A

CN102506361A - LED backlight module

Info

Publication number: CN102506361A
Application number: CN201110374433XA
Authority: CN
Inventors: 苏世虎
Original assignee: Nanjing CEC Panda LCD Technology Co Ltd
Current assignee: Nanjing CEC Panda LCD Technology Co Ltd
Priority date: 2011-11-22
Filing date: 2011-11-22
Publication date: 2012-06-20

Abstract

An LED backlight module comprises at least one LED luminous source (260), a group of reflection devices (230), a light guide plate (220), a framework (200), a back plate (240) and a groups of optical films, wherein each LED luminous source (260) is arranged on the light incoming surface side of the light guide plate (220); the light emitting surface of the LED luminous source (260) is opposite to the light incoming surface of the light guide plate (220); a certain angle ranging from 0 to 90 DEG is formed between the light emitting surface of the LED luminous source (260) and the light source side surface of the light guide plate (220); and a slot (250) corresponding to each LED luminous source (260) is formed on the light guide plate (220). As the light guide plate adopts the slot taking the structure of a concave lens, the LED backlight module comprising the light guide plate has the advantage that the defects of large light mixing distance and dark space in the prior art are overcome, that is, the light mixing distance is effectively reduced, and the dark space is reduced or even eliminated. Therefore, the utilization ratio of light in the light guide plate is improved.

Description

LED-backlit source module

Technical field

The present invention relates to LCD, the LED-backlit source module of LCD especially, specifically a kind of LED-backlit source module that improves light utilization efficiency in the LGP.

Background technology

At present, liquid crystal indicator has light weight, thin thickness, end power consumption and the little characteristics of radiation, has been widely used in fields such as information technology, multimedia technology, becomes the main flow of various display unit.Because liquid crystal panel itself is not luminous, needing backlight source module is that it provides light source.Generally speaking, the backlight source module light source has cathode fluorescent tube (CCFL) and light emitting diode (LED).The cathode fluorescent tube mercury that contains hazardous substance is undoubtedly a kind of injury for environmental protection, and the cathode fluorescent tube life-span is short, directly influences the service life of liquid crystal indicator.That light emitting diode has is pollution-free, long-life, vibration resistance, shock resistance and free of contamination characteristics.

Therefore, adopting the light source source of LED as backlight, is the inexorable trend of liquid crystal display development.LED generally uses on undersized LCDs, and is first-class like mobile phone, PDA, notebook.Because the LED continuous advancement in technology, make the brightness of LED that bigger lifting arranged in recent years, the main alternative of large scale liquid crystal backlight sources of display device light source during LED has become, LED as the demand of liquid crystal indicator back light in continuous increase.

LED is as the light source source of backlight source of liquid crystal display apparatus, and in middle large scale, arrangement is in the one or both sides of Liquid Crystal Module back light unit and the LED of above layout some, perhaps is arranged to straight-down negative in the large scale.

As shown in Figure 1, be a kind of liquid crystal display structure sketch map of prior art side light type LED back light module.This device comprises light source 130, a LGP 110, framework 120, one group of reflection diaphragm 140, a liquid crystal display 100 and one group of blooming piece.This framework 120 is accommodated LGP 110, light source 130, reflection diaphragm 140, liquid crystal display 100 and blooming piece.This LGP has incidence surface, and reflection diaphragm 140 reflectings surface and LGP 110 non-incidence surfaces and non-exiting surface are oppositely arranged, and light source 130 is arranged on the incidence surface side of LGP 110, and the exiting surface of light source 130 and the incidence surface of LGP are oppositely arranged.

Because of LED is a spot light; And the LED exiting surface has certain beam angle a; Be generally 120; Between adjacent two LED130 one determining deviation is set, after light that LED130 sends leaves LED130 exiting surface certain distance, just mixes with the light that adjacent LED130 light source sends, light mixing distance is relevant with the spacing of 130 settings of adjacent LED.Before adjacent two LED mixed lights, there is a dark space 150 between two LED.Therefore when satisfying the gray scale specification requirement, bigger like the spacing that is provided with between LED, then the light mixing distance between adjacent LED just increases, and the dark space also increases.For solve light mixing distance big with mixed light before the dark space problem that exists, a kind of method is an increase LED130 quantity, reduces spacing between LED130.So not only increased cost, caused that module power consumption backlight increases, more backlight LED quantity module power consumption be also high more simultaneously, and caloric value is also big more, and module backlight is also heavy more, and cost is also high more.Another method increases light mixing distance between adjacent LED exactly; Make the dark space be distributed in LGP 110 with exterior domain; This will increase the size of backlight source module; Cause the increase of weight and cost, but and the excursion of light mixing distance receive restrictions such as integrally-built maximum profile specification, also be limited through increasing that this method of light mixing distance solves.In addition, along with the continuous development of LED self-technique, the brightness of LED light efficiency and single LEDs constantly is improved, and the LED quantity of using in the liquid crystal module of same size is fewer and feweri.

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Summary of the invention

The objective of the invention is to have the problem of dark space between the adjacent LED light source, propose a kind of LED-backlit source module in the liquid crystal indicator.Concave structure through in the groove of light source place is expanded the angle that led light source sends light; Reduce the light mixing distance between adjacent LED; Reduce and eliminate the dark space that exists between adjacent LED; Simultaneously, light reflecting device is set, improves the utilization rate of light in the LGP through the non-incidence surface place, LGP side between two adjacent LED.

Technical scheme of the present invention is:

A kind of LED-backlit source module; It comprises at least one LED light emitting source, one group of reflection unit, a LGP, a framework, a backboard and one group of blooming piece; Each light emitting source LED all is arranged on LGP incidence surface side; The exiting surface of described light emitting source LED and the incidence surface of LGP relatively and with the angled setting in side at LGP light source place, angle is spent between 90 degree 0, corresponding each LED light emitting source is provided with groove on the LGP.

One group of reflection unit of the present invention comprises the reflection unit at the non-exiting surface place that is arranged on the upper and lower both sides of LGP and the reflection unit of the non-incidence surface in LGP side between each adjacent LED light emitting source.

Reflection unit of the present invention is reflection diaphragm or reflectance coating.

The one side of groove of the present invention is the concavees lens structure, and the exiting surface of concave surface and light emitting source LED is oppositely arranged.

It is protruding that several micro-structurals are set towards the position of LED light emitting source on the concave surface of groove of the present invention.

This micro-structural convexity of the present invention is cone or icicle body, and this protruding section is triangle, ellipse, semicircle, rhombus, trapezoidal, rule or the irregular polygon or the diffusion particle of light.

Promptly cover in that one side is obstructed at least above the groove and below groove in the exiting surface of LGP of the present invention by the face of LGP, make that the LED light emitting source sends towards the light of LGP exiting surface direction and the light entering LGP of LGP optics site face direction.

Beneficial effect of the present invention:

The present invention adopts the LGP that has concavees lens structure groove to constitute LED-backlit source module; Can solve light mixing distance in the prior art big with the deficiency that has the dark space; Effectively reduce light mixing distance, reduce even eliminate the dark space of existence, improve the utilization rate of light in the LGP.

Through the non-incidence surface place, LGP side between each adjacent LED light reflecting device is set among the present invention, improves the utilization rate of light in the LGP.

Description of drawings

Fig. 1 is the liquid crystal indicator vertical view of prior art LED-backlit source module.

Fig. 2 is a LED-backlit of the present invention source module vertical view.

Fig. 3 is the sectional schematic diagram of Fig. 2 LED-backlit source module.

Fig. 4 is an A portion enlarged drawing among Fig. 2.

Fig. 5 is another shape of A portion enlarged drawing groove concave lens arrangement among Fig. 2.

Fig. 6 is another shape of A portion enlarged drawing groove concave lens arrangement among Fig. 2.

Fig. 7 is the planform sketch map of groove in the leaded light.

Fig. 8 is a B portion enlarged drawing among Fig. 7.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is further described.

A kind of LED-backlit source module; Like Fig. 2, Fig. 3; Be an embodiment of the present invention, this backlight source module comprises at least one LED light emitting source 260, one group of reflection unit 230, a LGP 220, a framework 200, a backboard 240 and one group of blooming piece, and light emitting source LED260 is arranged between backboard 240 and LGP 220 incidence surfaces; Light emitting source LED260 exiting surface is towards the incidence surface of LGP 220; And angled setting, angle is spent between 90 degree 0, and the exiting surface position of corresponding light emitting source LED is provided with groove 250 on the LGP 220.

Like Fig. 4, be A portion enlarged drawing among Fig. 2.The light beam 1 that LED light emitting source 260 sends arrives the incidence surface of LGP; The light beam that behind nick lens arrangement 280 on the LGP incidence surface, gets into LGP is 2; Because of concavees lens have disperse function to light; The light beam 1 of light emitting source LED gets into the light beam 2 of angled increase behind the LGP, realizes shortening light mixing distance between the adjacent LED light emitting source 260, reduces even eliminates the dark space.Be provided with reflection unit at the non-LED light of LGP incidence surface position 230-3 and 230-4, improve the light utilization efficiency after LED light gets into LGP, reflection unit can be a reflection diaphragm, reflectance coating, and surface treatment and the structure etc. that can reach reflecting effect.

Like Fig. 5, be another shape of incidence surface concavees lens in the A portion enlarged drawing leaded light board slot among Fig. 2, it is protruding that concavees lens structure 280 is provided with several micro-structurals towards light emitting source LED260, and the cross section becomes oval arcuation.

Like Fig. 6; It is another shape of incidence surface concavees lens in the A portion enlarged drawing leaded light board slot among Fig. 2; It is protruding that nick lens arrangement 280 is provided with several micro-structurals towards light emitting source LED260; The cross section triangularity, and the protruding height of micro-structural and thin sweet degree change in that angle direction is different with the LED luminous intensity.

Like Fig. 7, be a planform sketch map of LGP incidence surface groove.

Like Fig. 8, be B portion enlarged drawing among Fig. 7.The exiting surface of LGP does not have opening above groove, make light emitting source LED get into LGPs at the light of LGP exiting surface 298 directions from the face 295 of LGP, improves the total amount that light that light emitting source LED sends gets into LGP, improves the utilization rate of light source light.On LGP incidence surface 295, can be provided with micro-structural, diffusion particle and printing net-point etc. improve the exiting surface zone optical quality of incidence surface 295 corresponding LGPs.

The present invention does not relate to all identical with the prior art prior art that maybe can adopt of part and realizes.

Claims

1. LED-backlit source module; It comprises at least one LED light emitting source (260), one group of reflection unit (230), a LGP (220), a framework (200), a backboard (240) and one group of blooming piece; Each light emitting source LED (260) all is arranged on LGP (220) incidence surface side; It is characterized in that described light emitting source LED (260) exiting surface and LGP (220) incidence surface relatively and with the angled setting in side at LGP light source place; Angle is spent between 90 degree 0, and LGP (220) is gone up corresponding each LED light emitting source (260) and is provided with groove (250).

2. LED-backlit according to claim 1 source module is characterized in that described one group of reflection unit (230) comprises the reflection unit (230-1,230-2) at the non-exiting surface place that is arranged on the upper and lower both sides of LGP and the reflection unit (230-3,230-4) of the non-incidence surface in LGP side between each adjacent LED light emitting source (260).

3. LED-backlit according to claim 2 source module is characterized in that said reflection unit (230-1,230-3,230-4) is reflection diaphragm or reflectance coating.

4. LED-backlit according to claim 1 source module, the one side that it is characterized in that described groove (250) are concavees lens structure (280), and the exiting surface of concave surface and light emitting source LED (260) is oppositely arranged.

5. LED-backlit according to claim 4 source module, it is protruding to it is characterized in that on the concave surface of described groove (250) being provided with towards the position of LED light emitting source (260) several micro-structurals.

6. LED-backlit according to claim 5 source module; It is characterized in that described this micro-structural is protruding is cone or icicle body, and this protruding section is triangle, ellipse, semicircle, rhombus, trapezoidal, rule or the irregular polygon or the diffusion particle of light.

7. LED-backlit according to claim 1 source module; It is characterized in that in the exiting surface (298) of described LGP (220) in groove (250) top and optics site face (292) in groove (250) below that one side at least is obstructed is promptly covered by the face (295) of LGP (220), makes the light entering LGP of LED light emitting source (260) in LGP exiting surface (298) direction and optics site face (292) direction.