CN201652060U

CN201652060U - LED backlight module

Info

Publication number: CN201652060U
Application number: CN2010201794782U
Authority: CN
Inventors: 李丰; 李杰民; 黄伟; 杨立梅
Original assignee: SUNA DISPLAYS CO Ltd
Current assignee: SUNA DISPLAYS CO Ltd
Priority date: 2010-05-05
Filing date: 2010-05-05
Publication date: 2010-11-24
Anticipated expiration: 2020-05-05

Abstract

The utility model discloses an LED backlight module, which comprises a light guide plate and a plurality of LEDs, wherein the LEDs are uniformly distributed below the light guide plate; the upper surface of the light guide plate is provided with a plurality of light expanding structures; the incident light emitted by the LEDs is derived to form output light through the light guide plate, and the output light presents a uniform face light source; and the light expanding structures are sunken spherical surfaces. The LED backlight module has the function of the application dynamic local dimming technology of direct backlight, can be used for preparing a large-area backlight flat plate, meanwhile can realize lightweight and ultra-thin devices, has good light transmittance and conversion efficiency, and realizes energy conservation and consumption reduction.

Description

A kind of LED-backlit module

Technical field

The utility model relates to a kind of module backlight, is specifically related to a kind of module backlight that uses led light source.

Background technology

(Light Emitting Diode LED) has that driving voltage lowly, low pollutes, in light weight, advantage such as volume is little, the life-span is long, has become such as one of topmost light source in the terminal applies such as FPD, outdoor lamp house advertisement because light emitting diode.But, led light source typically shows and is a kind of spot light, its light that sends has very strong directionality, its intensity sharply reduces with the increase of angle, therefore in terminal applies such as LCD TV, outdoor lamp house advertisement, usually need to adopt special structure to realize the conversion of spot light, improve the inhomogeneity purpose of light source, promptly obtain exporting the equally distributed area source of light to reach to area source.

In existing LED-backlit module, the arrangement mode of LED mainly is divided into two kinds of side entering type and straight-down negatives.

Existing side entrance back module is referring to shown in the accompanying drawing 1, wherein LED2 and reflector 4 are arranged on the side of LGP 1, the base material of LGP 1 is common PMMA material, and in the lower surface place of LGP 1 a plurality of microstructure or ink dots 5 that can be used for changing the light direction of propagation are set, utilize micro-structural or ink dot on the LGP 1 that the light that led light source produces is converted to area source; Reflecting plate 6 closes on the below that is arranged on LGP, be used for the light that will leak out from the LGP lower surface inside of reflected back LGP again, to reduce the loss of light, light-diffusing film 7 closes on the top that is arranged on LGP, is used to make from the further homogenising of the light of LGP outgoing.Because the light source setting of side entrance back is distributed in the side of LGP, thereby realize the ultrathin design of device easily, but light will experience repeatedly total reflection in LGP, because the absorption of LGP material can cause the loss of a part of light, and owing to be subject to the limitation of led light source brightness, therefore and be not suitable for large-area FPD backlight the homogenising that realizes the large tracts of land light source is difficulty relatively comparatively speaking.In addition, side entrance back can't be used Dynamic Local light modulation (Local Dimming) technology, is difficult to realize than quantum jump aspect dynamic contrast and energy-conserving and environment-protective.

Existing down straight aphototropism mode set is referring to shown in Figure 2, and wherein LED2 and reflector 4 are arranged on the below of light mixing plate 8, and keeps certain even light space with light mixing plate 8, and the light that sends from LED2 passes through the mixed light effect formation area source of light mixing plate.Compare with side entrance back, down straight aphototropism mode set does not generally adopt LGP, but by means of expanded type splicing and light mixing plate.Direct-type backlight is the basis of realizing two-dimentional Dynamic Local light modulation than the homogenising that is easier to realize the large tracts of land light source.But because LED is typical spot light, its light that sends diffusion angle is limited, if it is directly that its importing is backlight, can the clear zone in light diffusion angle, occur and outside light diffusion angle, the dark space occur, therefore be difficult for reaching the purpose of even bright dipping, usually need realize the purpose of light source homogenising by means of light mixing plate or diffuser plate.Because the distance between light mixing plate or diffuser plate and the light source is big more, the mixed light effect is good more, therefore in order to obtain good mixed light effect, guarantees that enough spacings are very important between light source and light mixing plate or the diffuser plate.Such as, in 32 inches LED-backlits, even light space requirement reaches 20～25mm, and in device today of densification day by day, this distance is difficult to satisfy the purpose that realizes ultra-thinization of device.In addition, light mixing plate or diffuser plate are to be working foundation to scattering of light and diffusion, and light transmittance is low, and the loss of light is big, and conversion efficiency is poor, and this is to realizing that energy-saving and cost-reducing obviously is disadvantageous.

Summary of the invention

The utility model purpose provides a kind of LED-backlit module, both can use the Dynamic Local light regulating technology, can realize ultra-thinization again.

For achieving the above object, the technical solution adopted in the utility model is: a kind of LED-backlit module, comprise LGP and a plurality of LED, described LED is distributed in the below of LGP, the upper surface of described LGP is provided with a plurality of expansion photo structures, the incident light that described LED sends is derived output light through LGP, and this output light is uniform area light source, and described expansion photo structure is the sphere of indent.

Above, the below with LED is located at LGP is equivalent to existing down straight aphototropism mode set mode, thereby makes it have the function of using the Dynamic Local light regulating technology; Simultaneously, expansion photo structure on the LGP can increase the diffusion angle of LED, promptly arriving a light part that expands the photo structure place penetrates from the LGP upper surface by refraction, another part light carries out mixed light by being reflected in LGP inside, by selecting suitable parameters, the dark space that LED light angle of flare is outside one's consideration brightens, thereby realizes the purpose of uniform area light source.Therefore light do not need too big even light space in the mixing of LGP inside in the side entrance back module because the mixed light of light in LGP inside is similar to, and realized the lightness and ultra-thinization of device.

Described sphere expands photo structure and can be hemispherical, also can be greater than hemisphere or less than the arc of hemisphere.

Further technical scheme, the quantity that described sphere expands photo structure is identical with LED, and one by one correspondence be located at LED directly over.Expanding the distribution density of photo structure and structural parameters can optimize and revise according to the distribution density of led light source and light guide plate, makes the output light of module backlight more even.

In the technique scheme, the below of described LED also is provided with reflector.

In the technique scheme, described LED can be vacant in the below of described LGP, also can be connected with LGP by any existing mode in glueing joint, embedding.

In the technique scheme, described LGP can constitute by the horizontal and vertical splicing of expanded type of expanding photo structure, also can adopt integral forming method to constitute.

Because the technique scheme utilization, the advantage that the utility model compared with prior art has is:

1, since the utility model with the below that LED is located at LGP, be equivalent to existing down straight aphototropism mode set structure, thereby make its function, and can prepare large-area flat board backlight with application Dynamic Local light regulating technology of direct-type backlight; Simultaneously, expansion photo structure on the LGP can increase the diffusion angle of LED, thereby realize the purpose of uniform area light source, because the mixed light of light in LGP inside is similar in the side entrance back module light in the mixing of LGP inside, therefore do not need too big even light space, can realize the lightness and ultra-thinization of device, also have good light transmittance and conversion efficiency simultaneously, realize energy-saving and cost-reducing.

2, the utility model is simple in structure, is easy to realize, is fit to promote.

Description of drawings

Fig. 1 is the structural representation of side entrance back module in the background technology;

Fig. 2 is the structural representation of down straight aphototropism mode set in the background technology;

Fig. 3 is the structural representation of the utility model embodiment one.

Wherein: 1, LGP; 2, LED; 3, expand photo structure; 4, reflector; 5, ink dot; 6, reflecting plate; 7, light-diffusing film; 8, light mixing plate.

The specific embodiment

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment one

Referring to shown in Figure 3, a kind of LED-backlit module, comprise LGP 1 and a plurality of LED2, described LED is distributed in the below of LGP, the upper surface of described LGP is provided with a plurality of expansion photo structures 3, the incident light that described LED sends is derived output light through LGP, and this output light is uniform area light source, and described expansion photo structure is the sphere of indent.The quantity that described sphere expands photo structure is identical with LED, and one by one correspondence be located at LED directly over.The below of described LED also is provided with reflector 4.

The light that sends from LED2 enters through the lower surface of LGP 1, when light runs into expansion photo structure 3 on the LGP, refraction and reflection take place in light, refract light directly penetrates from the upper surface of LGP, reflection ray comes back to LGP inside, reflection through the LGP lower surface arrives in the LED light diffusion angle dark space in addition, thereby the dark space is brightened; Repeatedly the effect of mixed light makes from the output light of LGP upper surface outgoing and reaches approximate consistent Illumination Distribution.

Described LED can be vacant in the below of described LGP, also can be connected with LGP by any existing mode in glueing joint, embedding.Described LGP and expansion photo structure thereof can adopt integral forming method to constitute, and also can constitute by the horizontal and vertical splicing of expanded type of expanding photo structure.

Embodiment two

Present embodiment with 32 inches backlight be that example elaborates: in original technology, as the even light space requirement 20～25mm of 32 inches LED-backlits even more.And in the present embodiment, the LGP material is the PMMA material, and refractive index is 1.48, and thickness is 5mm; It is the LED of OSR57B-FY that LED adopts the Ou Silang model; The LED spacing is 9.9mm * 9.34mm; Expanding photo structure is the hemisphere face of radius 2.5mm; 32 inches backlight can realizations in the splicing on horizontal and vertical by above-mentioned LED.

Adopt optics software Lightools not adding the expansion photo structure and adding and expand the ray tracing Illumination Distribution that obtains under the photo structure situation.The result is as follows: if do not expand photo structure, well-defined clear zone and dark space are arranged on the Illumination Distribution figure; Expand photo structure by on LGP, adding, can obtain the approximate consistent area source of Illumination Distribution, and expand photo structure, whole 32 inches even light spaces backlight can be controlled in the 10mm by on LGP, adding.

Claims

1. LED-backlit module, comprise LGP (1) and a plurality of LED (2), it is characterized in that: described LED is distributed in the below of LGP, the upper surface of described LGP is provided with a plurality of expansion photo structures (3), the incident light that described LED sends is derived output light through LGP, this output light is uniform area light source, and described expansion photo structure is the sphere of indent.

2. LED-backlit module according to claim 1 is characterized in that: the quantity that described sphere expands photo structure is identical with LED, and one by one correspondence be located at LED directly over.

3. LED-backlit module according to claim 1 is characterized in that: the below of described LED also is provided with reflector (4).

4. LED-backlit module according to claim 1 is characterized in that: described LED adopt vacant, glued joint or the mode that embeds is located at the below of LGP.

5. LED-backlit module according to claim 1 is characterized in that: described LGP is by expanding horizontal and vertical being spliced to form of expanded type of photo structure.