CN101639185A

CN101639185A - LED backlight module

Info

Publication number: CN101639185A
Application number: CN200910195092A
Authority: CN
Inventors: 刘品德
Original assignee: SVA Group Co Ltd
Current assignee: SVA Group Co Ltd
Priority date: 2009-09-03
Filing date: 2009-09-03
Publication date: 2010-02-03

Abstract

The invention discloses an LED backlight module which comprises a back board, a plurality of monochromatic LED light sources which are installed on the back board and a light blending board which blends the color of light emitted from the plurality of monochromatic LED light sources and diffuses the light, wherein the light blending board is a light guiding board with a groove, the groove containsthe LED light sources, and reflecting network points are arranged on the surface of the groove. The LED backlight module provided by the invention is favorable for increasing the diffusion angle of the LED light sources and reducing the thickness of the backlight module, thereby thinning the backlight module.

Description

The LED-backlit module

Technical field

The present invention relates to a kind of backlight liquid crystal display module, particularly a kind of module backlight that uses led light source.

Background technology

In recent years, because that LCD (LCD) equipment has a volume is little, frivolous, advantages such as low power consuming have obtained very big development.Because LCD equipment is the passive type electronic display unit, he needs a module backlight that brightness is provided, and module backlight is divided into straight-down negative and side-light type again.Side-light type module backlight comprises the light source of LGP and setting and this LGP side, and LGP will be derived forward by the light that light source sends.Down straight aphototropism mode set comprises a plurality of light sources that are formed at the display panels rear surface, and the light that is sent by light source is transmitted directly on this display panels.

Now relatively the light source of LCD module backlight commonly used is cold-cathode fluorescence lamp (CCFL) since the mercury that is full of among the CCFL easily and metal nodule form mercury alloy, so can reduce the service life of the module backlight of use CCFL.Further, brightness varies with temperature very big, and colour gamut is smaller, and mercury also may cause environmental pollution.

For the problem of the module backlight that solves above-mentioned use CCFL, LED is by widely as the light source of module backlight.In the module backlight that with LED is light source, the spacing and the mixed light height that blend together between the light source with LED of its white light are relevant, different spacings has different mixed light height between each light source, Fig. 1 is the schematic cross-section of existing a kind of straight-down negative mixed light type LCD, this LCD comprises module 1 backlight and display panels 2, and module 1 backlight comprises backboard 11; Reflector plate 12 is arranged on backboard 11 tops; A plurality of red, green, blue light emitting diode (LED) light sources 13 (printed circuit board (PCB) and LED fit together among the figure, general designation LED) that are installed on the backboard 11; The light mixing plate of forming by diffusion sheet and transparent panel 14, be arranged on a plurality of red, green, blue light emitting diodes (LED) light source 13 tops, light mixing plate 14 is a diffuser plate, can penetrate the light that comes to led light source 13 and produce diffusion, with the expansion of LED rising angle and with equalizing light rays; The white light of last even light mixing is injected panel of LCD 2 through light mixing plate 14.

Fig. 2 is the enlarged diagram in W zone among Fig. 1, three led light sources among the figure are respectively the red, green, blue led light source, the light path that has been shown in dotted line red, green, blue led light source 13 among the figure, the a-quadrant is the direct mixed light of red, green, blue LED district, through after the light mixing plate 14, the mixed light zone becomes B, and the mixed light area B obviously increases than regional A.

When LCD adopts LED to make light source, light source is made up of red, green, blue LED, need the process certain distance and utilize light mixing plate 14 could produce uniform look source, that is to say, because the angle of divergence of the light that LED sent is also little, therefore light mixing plate 14 is to keeping certain distance between the backboard 11, be light mixing distance d0, just the light of all kinds that led light source 13 is sent can fully mix, uniform white light is provided for display panels 2, this light mixing distance d0 needs about more than 30 millimeters at least.In addition, if use blooming piece such as other diffusion sheets on light mixing plate 14, though light can increase the mixed light zone after by blooming pieces such as diffusion sheets, the distance that increases is limited, and brightness is descended.

Therefore, in above-mentioned module backlight, its thickness can be subjected to the restriction of the distance between light mixing plate 14 and the backboard 11 and be difficult for reducing, and makes the integral thickness of LCD can't meet the trend of slimming.Therefore, how to shorten the distance between light mixing plate and the backboard, and then reduce the integral thickness of LCD, become the problem that becomes more and more important.

Summary of the invention

Technical problem to be solved by this invention provides a kind of LED-backlit module, helps increasing led light source diffusion angle, reduces module thickness backlight, realizes module slimming backlight.

The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of LED-backlit module, comprises a backboard; A plurality of monochromatic LED light sources are installed on the described backboard; Light mixing plate makes from described a plurality of monochromatic LED light sources and penetrates next light colour mixture diffusion; Wherein, described light mixing plate is the LGP of band groove, and described groove holds described led light source, and described groove surfaces is provided with the reflection site.

Above-mentioned LED-backlit module, described a plurality of monochromatic LED light sources are R, G, B monochromatic LED light source.

The present invention contrasts prior art following beneficial effect: LED-backlit module provided by the invention, LGP by the band groove changes the led light source direction, increase led light source diffusion angle, increase the light mixing distance of horizontal direction simultaneously and reduced the light mixing distance of vertical direction, thereby the thickness of LED-backlit module is reduced, realize module slimming backlight.In addition, when the present invention uses R, G, B monochromatic LED light source,, the good panel image quality of high colour gamut and high-contrast be can obtain, slimming and high colour gamut realized simultaneously by driving control.

Description of drawings

Fig. 1 is the schematic cross-section of existing a kind of straight-down negative mixed light type LCD;

Fig. 2 is the enlarged diagram in W zone among Fig. 1;

Fig. 3 is the light conducting plate structure schematic diagram that the band groove that uses in the LED-backlit module of the present invention and site are arranged;

Fig. 4 is the index path of the single LED of the present invention;

Fig. 5 is the index path of two monochromatic LED mixed lights of the present invention.

Among the figure:

1 module 2 display panels backlight

11 backboards, 12 reflector plate 13LED light sources

14 light mixing plate, 15 grooves, 16 reflection sites

The specific embodiment

Below in conjunction with accompanying drawing embodiments of the invention are further described.

Fig. 3 is the light conducting plate structure schematic diagram that the band groove that uses in the LED-backlit module of the present invention and site are arranged.

See also Fig. 1 and Fig. 3, LED-backlit module of the present invention comprises a backboard 11; A plurality of monochromatic LED light sources 12 are installed on the backboard 11 by certain requirement of arranging by adhesive or scolder; Light mixing plate 14 makes from described a plurality of monochromatic LED light sources and penetrates next light colour mixture diffusion; Wherein, described light mixing plate 14 is the LGP of band groove, and described groove 15 holds described led light source 13, and described groove 15 surfaces are provided with reflection site 16.

The present invention replaces with LGP with diffuser plate in existing down straight aphototropism mode set, and on LGP, increase groove 14, and groove 14 inner surfaces are arranged the reflection site, the luminous component of led light source is inserted in the groove, LGP by the band groove changes the led light source direction, increases led light source diffusion angle, increases the light mixing distance of horizontal direction simultaneously and has reduced the light mixing distance of vertical direction, thereby the thickness of LED-backlit module is reduced, realize module slimming backlight.

Fig. 4 is the index path of the single LED of the present invention.

See also Fig. 4, the part light that the single led light source 13 of the present invention sends enters the LGP bottom after LGP 14 reflections of band groove, penetrate after the LGP bottom reflection again, therefore increases led light source diffusion angle, reduces module thickness backlight.When led light source diffusion angle met the demands, LED-backlit module of the present invention did not need blooming pieces such as diffusion sheet.

See also Fig. 5, when the present invention uses R, G, B monochromatic LED light source, the part light that led light source 13 sends carries out mixed light at A place, mixed light zone after LGP 14 reflections of band groove, it is LED-backlit module of the present invention has reduced vertical direction by the light mixing distance that increases horizontal direction light mixing distance, thereby the thickness of LED-backlit module is reduced, realize module slimming backlight.In addition, when the present invention uses R, G, B monochromatic LED light source,, the good panel image quality of high colour gamut and high-contrast be can obtain, slimming and high colour gamut realized simultaneously by driving control.

Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.

Claims

1, a kind of LED-backlit module comprises:

One backboard;

A plurality of monochromatic LED light sources are installed on the described backboard;

Light mixing plate makes from described a plurality of monochromatic LED light sources and penetrates next light colour mixture diffusion;

It is characterized in that described light mixing plate is the LGP of band groove, described groove holds described led light source, and described groove surfaces is provided with the reflection site.

2, LED-backlit module as claimed in claim 1 is characterized in that, described a plurality of monochromatic LED light sources are R, G, B monochromatic LED light source.