CN201757335U - LED backlight module, liquid crystal display and display terminal - Google Patents

Abstract

The utility model is applicable to the field of liquid crystal display and provides an LED backlight module which comprises LED light sources arranged on an LED lamp panel, a diffusion sheet, a prism sheet and a brightness enhancement film, wherein, the diffusion sheet, the prism sheet and the brightness enhancement film are arranged in the light-emitting direction of the LED light sources in sequence; the LED backlight module further comprises a light guide plate arranged between the LED lamp panel and the diffusion sheet; grooves for enlarging the emergence angle of light are formed on one surface of the light guide plate which faces to the LED light sources; and the grooves are in one-to-one correspondence with the LED light sources in position. The utility model has the characteristic that the light guide plate provided with the grooves are additionally arranged on the basis of the structure of the conventional direct light type LED backlight module, so that after emergence light of an LED enters the light guide plate, the actual emergence angle of the light is increased, and the light mixing distance is reduced; therefore, a thinned LED backlight module is obtained, and the thickness of a liquid crystal display is further decreased.

Description

A kind of LED-backlit module, LCD and display terminal

Technical field

The utility model belongs to field of liquid crystal display, relates in particular to a kind of LED-backlit module, LCD and display terminal.

Background technology

In the backlight of LCD field, major part all adopts cold-cathode fluorescence lamp (CCFL) backlight technology at present, and its color saturation is about 72%, than LED-backlit source low about 20%.Simultaneously, the brightness after using 2 years～3 years of most CCFL backlights significantly descends, and color also can change, and the CCFL power consumption is also bigger.The LED-backlit source has advantages such as fast, compliance with environmental protection requirements (no Hg) of long-life, power saving, low operating voltage, wide colour gamut, low-temperature operation, response speed, antidetonation, has become environmental protection of new generation, energy-conserving light source in the display panels industrial chain.

The LED-backlit module is divided into two kinds of side-light type and straight-down negatives according to its optical texture, and the led light source of side-light type module is arranged in the panel side, by LGP with distribution of light to panel, the led light source of straight-down negative module directly is distributed in the liquid crystal panel below.The light uniformity of direct LED backlight is than the side-light type height, easily realize dynamic area control, but because the light energy distribution of LED bright dipping is lambert's type, light energy concentrates in the axial low-angle, directly the LED with this luminous intensity distribution is placed on the panel below, be difficult to the even illumination on the realization panel, for fear of because of light source produces light inhomogeneous (Mura) situation near the top blooming piece very much, need keep certain light mixing distance between backlight and blooming piece, just can obtain uniform white light, and the spacing of LED is big more, light mixing distance is big more, and for cost consideration, led light source is too much unsuitable, so module backlight is thicker, cause the LCD complete machine also thicker.

The utility model content

The purpose of the utility model embodiment is to provide a kind of LED-backlit module, is intended to solve the existing bigger problem of LED-backlit module thickness.

The utility model embodiment realizes like this, a kind of LED-backlit module, comprise the led light source be located on the LED lamp plate, be located at diffusion sheet, prismatic lens and brightness enhancement film on the light direction of described led light source successively, described LED-backlit module also comprises the LGP of being located between described LED lamp plate and the described diffusion sheet;

Described LGP is provided with the big groove of shooting angle change that makes light towards the face of described led light source;

The position of described groove is corresponding one by one with the position of described led light source.

As optimal technical scheme of the present utility model:

Described groove is coniform, pyramid-shaped, round table-like or terrace with edge shape.

Described LGP fits in described LED lamp plate surface, perhaps and between the described LED lamp plate leaves the gap; Described groove covers in described led light source outside.

Described LGP is that refractive index is 1.49～1.62 acrylic resin LGP.

Described led light source is a white light LEDs, perhaps is Red Green Blue LED.

Described led light source is that two dimension is equally spaced.

Another purpose of the utility model embodiment is to provide a kind of LCD, and described LCD comprises above-mentioned LED-backlit module.

Another purpose of the present utility model is to provide a kind of display terminal, and described display terminal comprises above-mentioned LCD.

The utility model embodiment sets up a LGP that has a groove in the structure of existing direct-light type LED backlight module, the emergent light that makes LED is behind LGP, and its actual angle of emergence increases, and light mixing distance reduces, obtain the LED-backlit module of slimming, and then reduced the thickness of LCD.

Description of drawings

Fig. 1 is the decomposition texture schematic diagram of the LED-backlit module that provides of the utility model first embodiment;

Fig. 2 is the main TV structure schematic diagram of the LGP that provides of the utility model first embodiment;

Fig. 3 is the structural representation of looking up of the LGP that provides of the utility model first embodiment;

Fig. 4 is the mixed light schematic diagram of existing down straight aphototropism mode set;

Fig. 5 is the index path that LED light that the utility model first embodiment provides passes LGP;

Fig. 6 be the utility model first embodiment that provide with existing mixed light principle contrast figure.

The specific embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

The utility model embodiment is applied to the direct-light type LED backlight module with LGP, to change the direction of propagation of light, reduces light mixing distance, and then reduces the thickness of LED-backlit module.

The utility model embodiment provides a kind of LED-backlit module, comprise the led light source be located on the LED lamp plate, be located at diffusion sheet, prismatic lens and brightness enhancement film on the light direction of described led light source successively, the LED-backlit module also comprises the LGP of being located between described LED lamp plate and the described diffusion sheet;

LGP is provided with the big groove of shooting angle change that makes light towards the face of described led light source;

The position of groove is corresponding one by one with the position of described led light source.

The utility model also provides a kind of LCD, and this LCD comprises above-mentioned LED-backlit module.

The utility model also provides a kind of display terminal, and this display terminal comprises above-mentioned LCD.

The utility model embodiment sets up a LGP that has a groove in the structure of existing direct-light type LED backlight module, make the light of LED penetrate light behind LGP, its actual angle of emergence increases, light mixing distance is reduced, obtain the LED-backlit module of slimming, and then reduced the thickness of LCD.

Below in conjunction with specific embodiment specific implementation of the present utility model is described in detail:

Embodiment one:

Fig. 1 shows the decomposition texture schematic diagram of the LED-backlit module that the utility model first embodiment provides, Fig. 2 and Fig. 3 show the main TV structure of the LGP that the utility model embodiment provides and look up structural representation, for convenience of explanation, only show the part relevant with the utility model embodiment.

This LED-backlit module comprises a plurality of led light sources 1 that are arranged on the LED lamp plate 2, light direction at led light source 1 sets gradually diffusion sheet 3, prismatic lens 4 and brightness enhancement film 5, fit mutually between diffusion sheet 3 and prismatic lens 4 and prismatic lens 4 and the brightness enhancement film 5 and be provided with, said structure and operation principle are identical with conventional direct-light type LED backlight module, repeat no more.Between LED lamp plate 2 and diffusion sheet 3, set up a LGP 6, LGP 6 is provided with and led light source 1 groove 7 one to one towards the one side of led light source 1, the opening surface of groove 7 is to led light source, its shape can be coniform, pyramid-shaped, round table-like or terrace with edge shape etc., be used to increase the actual angle of emergence of LED light, to reduce light mixing distance, as shown in Figure 4.

In the utility model embodiment, the light that led light source 1 sends is injected LGP 6 through the inclined plane of groove 7, through a series of reflections, scattering and refracting process, the light angle of emergence is increased in LGP 6, and forms uniform area light source ejaculation LGP.After emergent light passes through the light harvesting effect of the diffusion of diffusion sheet 3 and prismatic lens 4 and brightness enhancement film 5 again, for display panels provides evenly backlight.

The principle that the utility model embodiment is reduced module thickness backlight is elaborated below:

In conjunction with the accompanying drawings 5, the light mixing distance formula of known down straight aphototropism mode set is:

$X=\frac{d/2}{\tan \left[\arcsin \right[\frac{\sin (\mathrm{\θ}/2)}{n}\left]\right]}$

Wherein, θ is the LED light angle of emergence, and n is the refractive index of LGP, and d is the spacing of two adjacent homochromy LED.Can reason out according to above-mentioned formula: when the actual angle of emergence became big, light mixing distance reduced, thereby made the LED-backlit module become thinner, reached module purpose of thinness backlight.

Further combined with accompanying drawing 6, the light that LED sends passes the plane of incidence (inclined plane of groove) and the exit facet of LGP 6, and twice refraction takes place, and has changed the direction of propagation, makes the angle of emergence by θ ₁Increase to θ ₂, and then make light mixing distance be reduced to Y by X.

The angle of inclination on the inclined plane of groove 7 is determined according to actual needs, according to the size of required light mixing distance and the spacing of adjacent LED light source, the angle of emergence of LED emergent light behind LGP can be determined, and then the angle of inclination on groove inclined plane can be determined in conjunction with the refractive index of the original angle of emergence of LED light and LGP.

Embodiment two:

In the utility model embodiment, LGP 6 can fit in the upper surface of LED lamp plate 2, also can leave the gap with LED lamp plate 2 upper surfaces, in order further to reduce the thickness of module backlight, preferably LGP 6 is fitted in the upper surface of LED lamp plate 2, make groove 7 cover in the led light source outside.

Embodiment three:

In the utility model embodiment, the effect of groove 7 is to increase the actual light angle of emergence, therefore its shape can have multiple, as regular shapes such as described coniform, the pyramid-shaped of above-mentioned embodiment one, round table-like or terrace with edge shapes, also can be that other are irregularly shaped, concrete shape be determined according to actual needs.

Embodiment four:

In the utility model embodiment, the optically transparent material of LGP 6 preferred highs index of refraction, as acrylic resin (PMMA), its refractive index is 1.49～1.62.

Embodiment five:

In the utility model embodiment, led light source 1 can be white light LEDs, also can be Red Green Blue LED, the i.e. combination of ruddiness, green glow and blue-ray LED.The preferably equidistant arrangement on two-dimensional directional of the distribution mode of led light source.

The utility model embodiment sets up a LGP that has a groove in the structure of existing direct-light type LED backlight module, the emergent light that makes LED is behind LGP, its actual angle of emergence increases, light mixing distance is reduced, obtain the LED-backlit module of slimming, and then reduced the thickness of LCD.The utility model embodiment also has the advantage of easily carrying out the dynamic control in zone of traditional direct-light type LED backlight module when realizing slimming, and, the size of led light source there is not strict demand.With the setting of fitting mutually of LGP and LED tabula rasa, further reduced the thickness of module backlight.

The LED-backlit module that the utility model embodiment provides is applicable to that to LCD provides backlight this LCD can also can be used as LCD TV, the display unit of computer or other display terminals separately as a display device.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.

Claims (8)

1. LED-backlit module, comprise the led light source be located on the LED lamp plate, be located at diffusion sheet, prismatic lens and brightness enhancement film on the light direction of described led light source successively, it is characterized in that described LED-backlit module also comprises the LGP of being located between described LED lamp plate and the described diffusion sheet;

Described LGP is provided with the big groove of shooting angle change that makes light towards the face of described led light source;

The position of described groove is corresponding one by one with the position of described led light source.

2. LED-backlit module as claimed in claim 1 is characterized in that, described groove is coniform, pyramid-shaped, round table-like or terrace with edge shape.

3. LED-backlit module as claimed in claim 1 is characterized in that, described LGP fits in described LED lamp plate surface, perhaps and between the described LED lamp plate leaves the gap; Described groove covers in described led light source outside.

4. LED-backlit module as claimed in claim 1 is characterized in that, described LGP is that refractive index is 1.49～1.62 acrylic resin LGP.

5. LED-backlit module as claimed in claim 1 is characterized in that, described led light source is a white light LEDs, perhaps is Red Green Blue LED.

6. LED-backlit module as claimed in claim 1 is characterized in that, described led light source is that two dimension is equally spaced.

7. a LCD is characterized in that, described LCD comprises each described LED-backlit module of claim 1 to 6.

8. a display terminal is characterized in that, described display terminal comprises the described LCD of claim 7.

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