CN202274376U

CN202274376U - Liquid crystal display backlight module and LCD (liquid crystal display)

Info

Publication number: CN202274376U
Application number: CN201120423680XU
Authority: CN
Inventors: 罗在力; 杨福军; 高建峰; 李建林
Original assignee: Shenzhen TCL New Technology Co Ltd
Current assignee: Shenzhen TCL New Technology Co Ltd
Priority date: 2011-10-31
Filing date: 2011-10-31
Publication date: 2012-06-13
Anticipated expiration: 2021-10-31

Abstract

The utility model discloses a liquid crystal display backlight module and an LCD (liquid crystal display), wherein the backlight module comprises a back board, a light source arranged on the back board and a diffuser plate arranged above the light source; a plurality of optical lattice points capable of transmitting and reflecting light are printed on the bottom of the diffuser plate; the light source comprises a plurality of LEDs (light-emitting diodes); an optical lens is covered outside each LED; and on the region, corresponding to each LED, of the bottom of the diffuser plate, the distribution density of the optical lattice points is gradually decreased from the center to the periphery, and/or the area of the optical lattice points on the region is gradually reduced from the center to the periphery. In the liquid crystal display backlight module, the light intensity generated by the LEDs is subjected to rearrangement of the optical lens and then dispersed and reflected by the optical lattice points on the diffuser plate, and then point light sources are transformed into area light sources with better uniformity; and by virtue of the adjustment on the density and size of the optical lattice points, the transmission intensity and reflection intensity of light in unit area are adjusted, thereby enabling the light to be guided out more uniformly so as to be provided for liquid crystal glass.

Description

LCD backlight module and LCD

Technical field

The utility model relates to technical field of liquid crystal display, relates in particular to a kind of LCD backlight module and LCD.

Background technology

At present, adopt LED to become the main development trend of LCD Display Technique as the ultra-thin LCD display spare of light source.

Existing ultra-thin LED displaying scheme backlight mainly adopts the module backlight of following structure.As shown in Figure 1, back light module unit structure shown in Figure 1 mainly is made up of preceding chase 201, liquid-crystalline glasses 202, center 203, blooming piece 204, diffuser plate 205, LED 206, reflector plate 207, PCB 208, heat-conducting glue double faced adhesive tape 209 and backboard 210.The light that LED206 above the PCB 208 produce through the reflection of the scattering of diffuser plate 205 and reflector plate 207 after upwards guiding, become area source through after the diffusion of blooming piece 204 and the integration, for the demonstration of liquid-crystalline glasses 202 provides light source.

But in the module backlight of the prior art, can't realize the light that LED sends is evenly derived.

The utility model content

The main purpose of the utility model is to provide a kind of display backlight module and LCD, is intended to realize that the light that LED sends can be by uniform derivation.

In order to achieve the above object; The utility model proposes a kind of LCD backlight module; Comprise backboard and be arranged on the light source on the said backboard; This module backlight also comprises the diffuser plate that is arranged on said light source top, the bottom of said diffuser plate be printed with some can transmission and catoptrical optics site; Said light source comprises some LED, and each said LED is covered with an optical lens outward; On the zone of corresponding each the said LED in said diffuser plate bottom, its optics site distribution density diminish gradually towards periphery by the center and/or said zone on the area of optics site diminish gradually towards periphery by the center.

Preferably, the power of said LED is at least 1W.

Preferably, said optics site is circle or polygon.

Preferably, said backboard has base plate and sidewall, and the base plate of said backboard is provided with PCB, and said light source is arranged on the said backboard through said PCB; Said diffuser plate is arranged on the top side wall of said backboard and is positioned at the top of said light source.

Preferably, this module backlight also comprises reflector plate, and said reflector plate is arranged between said LED and the PCB.

Preferably, be provided with heat-conducting glue between said backboard and the said PCB, said PCB is fixedly connected with said backboard through said heat-conducting glue.

Preferably, said optical lens is for producing the curved lenses of the light distribution that the right and left symmetry and the right and left are high, the centre is low.

Preferably, this module backlight also comprises blooming piece, and said blooming piece is arranged on the top of said diffuser plate.

The utility model also proposes a kind of LCD, comprises preceding frame, center, the liquid-crystalline glasses before said between frame and the center, and the module backlight that is positioned at said center below, and said module backlight is aforesaid module backlight.

In module backlight and LCD that the utility model proposes; Through outside great power LED, being covered with optical lens, and the optics site is set, makes the redistribution of light intensity that great power LED produces through optical lens in the bottom that is positioned at the diffuser plate above the LED; Again after the scattering and reflection through the optics site on the diffuser plate; The spot light of LED is converted into uniformity area source preferably, offers liquid-crystalline glasses, can adjust the density and the size of optics site simultaneously; And then the transmission of unit of adjustment's zonal ray and reflected intensity, light can be derived more uniformly.

Description of drawings

Fig. 1 is the structural representation that prior art has the LCD of down straight aphototropism mode set;

Fig. 2 is the structural representation of first embodiment of the utility model LCD;

Fig. 3 is the structure cutaway view of optical lens among first embodiment of the utility model LCD;

Fig. 4 is that LED installs the curve of light distribution sketch map behind the optical lens additional among first embodiment of the utility model LCD;

Fig. 5 is the site style distribution schematic diagram on the zone of corresponding each LED on the diffuser plate among first embodiment of the utility model LCD.

For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.

The specific embodiment

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.

As shown in Figure 2, Fig. 2 is the structural representation of first embodiment of the utility model LCD.The present embodiment LCD comprises preceding frame 301 made of iron, center 303, the liquid-crystalline glasses 302 between preceding frame 301 and center 303; And the module backlight that is positioned at center 303 belows; This module backlight comprises backboard 311, PCB 309, light source, diffuser plate 305, reflector plate 308, blooming piece 304 and heat-conducting glue 310, wherein:

Backboard 311 has base plate and sidewall, and PCB309 is arranged on the backboard 311, and heat-conducting glue 310 is arranged between backboard 311 and the PCB309, and PCB309 is fixedly connected with backboard 311 through heat-conducting glue.

Light source is arranged on the PCB 309, and this light source specifically comprises some LED307, and LED307 is a high-power lamp in the present embodiment, and its power is more than or equal to 1W.

Diffuser plate 305 is arranged on the top of the two side of backboard 311, and is positioned at the top of light source, and present embodiment prints the optics site 312 with certain transmission and reflex in the bottom of diffuser plate 305.Above-mentioned optics site 312 can make through the LED307 light after optical lens 306 transmissions and produce scattering and reflection; After the diffusion and integration through blooming piece 304; The spot light of LED307 is changed into uniformity area source preferably, for the demonstration of liquid-crystalline glasses 302 provides light source.

Blooming piece 304 is arranged on the top of diffuser plate 305.Reflector plate 308 is arranged between LED307 and the PCB309, is used for the LED light that anacamptics site 312 reflects.

Particularly, in the present embodiment, each LED307 is covered with an optical lens 306 outward, and the structure of this optical lens 306 is as shown in Figure 3.Fig. 3 is the structure cutaway view of optical lens in the present embodiment.

Optical lens 306 is used for the light intensity redistribution that great power LED 307 is produced and is incident to diffuser plate 305.

The luminous signal and the curve of light distribution that the great power LED 307 that present embodiment uses installs additional behind the optical lens 306 are as shown in Figure 4.

Present embodiment itself does not limit optical lens 306, as long as can produce high, the middle lens that hang down the batwing curve of light distribution of this class of left-right symmetric as shown in Figure 4 and the right and left all at the row of the utility model protection.

The utility model embodiment solution mainly is: outside great power LED 307, be covered with optical lens 306; And optics site 312 is set in the bottom that is positioned at the diffuser plate 305 above the LED307; Make and the redistribution of the light intensity process optical lens 306 that great power LED 307 produces after the scattering and reflection through the optics site 312 on the diffuser plate 305, spot light is converted into uniformity area source preferably again; The light that LED307 is sent can be derived more uniformly; Offer liquid-crystalline glasses 302, and, help the ultra-thinization design of LCD owing to do not need LGP that the light light that LED307 produces is conducted.

Wherein, The distribution signal of the optics site 312 of each LED corresponding region on diffuser plate 305 is as shown in Figure 5; On the zone for corresponding each LED307 in diffuser plate 305 bottoms, the distribution density of optics site 312 is diminished by the center towards periphery gradually, and perhaps the area of optics site 312 is diminished by the center towards periphery gradually; In conjunction with the luminous characteristics of LED, the light that makes LED307 send is derived uniformly.

In practical application, have certain transmission and reflex in order to make optics site 312, can realize through the proportioning of adjusting the printing ink of using in the printshop.

In addition, the shape of optics site 312 can be the geometric figure of sealing, such as, can be circle or polygon, polygon can be triangle, rectangle or trapezoidal etc., but is not limited to above-mentioned several kinds of shapes.

The module backlight that present embodiment provides is when concrete the use; The light intensity that great power LED 307 produces is through behind the optical lens 306; Be printed on optics site 312 a part of transmissions on the diffuser plate 305, a part of reflection is through optics site 312 light of returning sheet 308 reflections that are reflected that are reflected; Arrive diffuser plate 305 once more, pass through 312 transmissions of optics site and reflection on the diffuser plate 305 once more.The light that transmission is gone out is by upwards guiding of diffuser plate 305 and blooming piece 304, and present embodiment can be adjusted the density and the size of optics site 312, transmission and reflected intensity that just can unit of adjustment's zonal ray, thus light can be derived more uniformly.

In addition, present embodiment is because the LED307 power that uses is bigger, thereby LED307 that only need be less; 100 LEDs 307 that tradition need be used reduce to 2-3 LEDs 307; Improve the reliability of LED307 module backlight, the cost of SMT and man-hour, also corresponding minimizing improved production efficiency.

Secondly, because great power LED 307 is distributed on the whole back plate 311, make that heat radiation is easier to handle; Through test; The utility model dorsulum 311 temperature are about 40 degree, therefore, need not use aluminium extruded or aluminium section bar radiator; Directly process the purpose that backboard 311 just can reach heat radiation, make cost reduce.

Simultaneously; Because the utility model uses great power LED 307, outside LED307, installs optical lens 306 additional, and in printing optical site, diffuser plate 305 bottom 312; Can the light that LED307 produces be exported to liquid-crystalline glasses 302 uniformly; Do not need LGP to carry out the light conduction, reduced the weight of LCD, and helped the ultra-thinization design of LCD.

Module backlight described in the foregoing description is a kind of LCD backlight module that the utility model proposes, and its internal structure and functional characteristics please with reference to the foregoing description, repeat no more at this.

The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical field, all in like manner be included in the scope of patent protection of the utility model.

Claims

1. a LCD backlight module comprises backboard and is arranged on the light source on the said backboard, it is characterized in that, also comprises the diffuser plate that is arranged on said light source top, the bottom of said diffuser plate be printed with some can transmission and catoptrical optics site; Said light source comprises some LED, and each said LED is covered with an optical lens outward; On the zone of corresponding each the said LED in said diffuser plate bottom, its optics site distribution density diminish gradually towards periphery by the center and/or said zone on the area of optics site diminish gradually towards periphery by the center.

2. module backlight according to claim 1 is characterized in that the power of said LED is at least 1W.

3. module backlight according to claim 1 is characterized in that, said optics site is circle or polygon.

4. module backlight according to claim 1 is characterized in that said backboard has base plate and sidewall, and the base plate of said backboard is provided with PCB, and said light source is arranged on the said backboard through said PCB; Said diffuser plate is arranged on the top side wall of said backboard and is positioned at the top of said light source.

5. module backlight according to claim 4 is characterized in that, also comprises reflector plate, and said reflector plate is arranged between said LED and the PCB.

6. module backlight according to claim 4 is characterized in that, is provided with heat-conducting glue between said backboard and the said PCB, and said PCB is fixedly connected with said backboard through said heat-conducting glue.

7. according to each described module backlight among the claim 1-6, it is characterized in that said optical lens is for producing the curved lenses of the light distribution that the right and left symmetry and the right and left are high, the centre is low.

8. module backlight according to claim 7 is characterized in that, also comprises blooming piece, and said blooming piece is arranged on the top of said diffuser plate.

9. LCD comprises preceding frame, center, the liquid-crystalline glasses before said between frame and the center, and the module backlight that is positioned at said center below, it is characterized in that said module backlight is each described module backlight among the claim 1-8.