CN201368382Y

CN201368382Y - Backlight

Info

Publication number: CN201368382Y
Application number: CNU2009201068152U
Authority: CN
Inventors: 崔来友
Original assignee: Beijing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Priority date: 2009-03-23
Filing date: 2009-03-23
Publication date: 2009-12-23
Anticipated expiration: 2019-03-23

Abstract

The utility model discloses a backlight, which comprises a light guide plate and a plurality of LEDs, also comprises a plastic frame used for reflecting the light emitted by the LEDs to the light guide plate, wherein the plastic frame comprises a first side edge, a connecting edge and a second edge which are sequentially connected and integrated; the first side edge abuts against an LCD panel; the second side edge is opposite to the first side edge; the connecting edge is connected between the second side edge and the first side edge; the end part of the light guide plate is arranged between the first side edge and the second side edge; and the LEDs are fixed on the connecting edge. The upper surface of the second side edge of the plastic frame is a wave curve-shaped reflecting surface, and the wave peak of the reflecting surface is opposite to the LEDs. The wave curve is a sine curve. The backlight has the advantages that the problem of spot image quality caused by the point light source of the LEDs is solved, the strength of an LCD module is improved, and the cost is effectively lowered.

Description

Backlight

Technical field

The utility model relates to LCD, particularly a kind of Backlight For Liquid Crystal Display Panels.

Background technology

At present, the Backlight For Liquid Crystal Display Panels structure as shown in Figure 1, Fig. 1 is the structural representation of prior art backlight, lamp group in this backlight is LED (Light Emitting Diode, hereinafter to be referred as: LED) lamp group structure, this backlight comprises the lampshade 11 of metal material, a plurality of point source of light LED 12 and LGP 13, wherein, point source of light LED 12 is by printed circuit board (PCB) (Printed Circuit Board, hereinafter to be referred as: PCB) 14 are fixed on the lampshade 11, and lampshade 11 is connected and fixed with the plastic frame 15 that is arranged on liquid crystal panel 16 edges.During this backlight work, the light that LED 12 sends incides on the liquid crystal panel 16 by LGP 13, thereby sends the light that needs.

But there are following two aspect defectives in current backlight of LCD structure: on the one hand, because LED 12 is a point source of light, so point source of light need be converted into area source, display frame preferably; And point source of light LED 12 of the prior art incides the light existence point light leak of liquid crystal panel 16, and the some places incident intensity a little less than the some places incident light, causes the picture of LCD the white point phenomenon can occur, display frame quality extreme difference when showing.On the other hand, LCD all has very high requirement to thickness, weight, cost etc., and therefore in existing LCD design, the lampshade 11 of backlight has adopted very thin metal material design, is generally 0.1mm～0.2mm.But because metal material is too thin, easy deformation causes the liquid crystal display device structure intensity difference; Simultaneously, requiring of 11 pairs of technologies of lampshade of thin metal material is high, and production is also relatively more difficult.

The utility model content

The purpose of this utility model provides a kind of backlight, realize liquid crystal display device structure intensity height, and implementation is simple.

The utility model provides a kind of backlight, comprise LGP and a plurality of light emitting diode, also comprise the plastic frame that is used for the light that described light emitting diode sends is reflexed to described LGP, described plastic frame comprises first side, fillet and the second side that links to each other and be structure as a whole successively, described first side is near liquid crystal panel, described second side is relative with the position, first side, described fillet is connected between described second side and the first side, and the end of described LGP is between described first side and second side; Described light emitting diode is fixed on the described fillet.

On the basis of such scheme, the upper surface of the second side of described plastic frame is the reflecting surface of wave curve shape, and the crest of described reflecting surface is relative with described light emitting diode.The lower surface of the first side of described plastic frame also is the reflecting surface of wave curve shape, and the crest of described reflecting surface is relative with described light emitting diode.Described wave curve is a sine curve.The width of the reflecting surface of described sinusoidal shape is 25mm at least.

The utility model backlight has improved the intensity of Liquid Crystal Module by adopting the incorporate structure of plastic frame, effectively reduces cost; And the lower surface of plastic frame is designed to sinusoidal shape, preferably spot light is converted into area source, solved the problem of the liquid crystal panel display quality difference that the LED spot light causes.

Description of drawings

Fig. 1 is the structural representation of prior art backlight;

Fig. 2 is the perspective view of the utility model backlight first embodiment;

Fig. 3 is the right side view of Fig. 2;

Fig. 4 is that A among Fig. 3 is to the projection structure schematic diagram;

Fig. 5 is the perspective view of the utility model backlight second embodiment.

The specific embodiment

Below by drawings and Examples, the technical solution of the utility model is described in further detail.

Fig. 2 is the perspective view of the utility model backlight first embodiment, Fig. 3 is the right side view of Fig. 2, Fig. 4 is that A among Fig. 3 is to the projection structure schematic diagram, as Fig. 2, Fig. 3 and shown in Figure 4, the backlight of present embodiment comprises a plurality of light emitting diodes 22, LGP 23, plastic frame 25 and reflectance coating 27.Present embodiment adopts the incorporate structure of plastic frame, this plastic frame 25 comprises the first side 251 of the structure that is connected as one successively, fillet 252 and second side 253, wherein first side 251 be used near and support liquid crystal panel (Fig. 2 is not shown) 26, second side 253 is relative with 251 positions, first side, fillet 252 is connected with the end of first side 251 with second side 253 respectively, the length of first side 251 is less than the length of second side 253, that is: the distance between the end of first side 251 and the fillet 252 is less than the end of second side 253 and the distance between the fillet 252.Present embodiment substitutes original lampshade 11 with plastic frame 25, directly uses the supporting mechanism of plastic frame 25 as a plurality of LED 22, is fixed in a plurality of LED 22 on the fillet 252 of plastic frame 25 by PCB 24; And the reflectance coating 27 that is sticked of the upper surface in the second side 253 of plastic frame 25 is to be used in combination by plastic frame 25 and reflectance coating 27 to be equivalent to original lampshade 11 at this moment, is used for the light that LED 22 sends is reflected.Wherein, also can not adopt the mode of the reflectance coating 27 that is sticked on the plastic frame 25, and the material that adopts on plastic frame 25 spraying reflecting material or will have a reflection function is doped in the plastic frame 25, reflexes to effect in the LGP 23 as long as this plastic frame 25 can play the light that LED 22 is sent.By the incorporate structural design of this plastic frame, directly use the supporting construction of plastic frame as LED lamp group, not only can strengthen the structural strength of liquid crystal display device module, and, can also reduce cost owing to do not re-use the lampshade of traditional metal material.

On the basis of such scheme, the upper surface of the second side 253 of the plastic frame 25 in the present embodiment can be set to the wave curvilinear plane, and the reflectance coating 27 that on this wave curvilinear plane, is sticked, make that the upper surface of second side 253 of this plastic frame 25 is the reflecting surface of wave curve shape; And, the crest place that each LED 22 is positioned at this wave curve reflecting surface is set.Wave curve in the present embodiment can be sine curve, and each LED 22 is positioned at this sinusoidal crest place; The width of this sinusoidal shape reflecting surface can for, the edge of sine curve Edge Distance LED is 25mm at least, the width that is the reflectance coating 27 shown in Fig. 3 is 25mm at least, can guarantee that like this most of light that LED 22 sends can both obtain the soft processing of sinusoidal shape reflecting surface.

Present embodiment adopts the action principle of sine curve reflecting surface to be: utilize the irregularity degree of sine curve reflecting surface of second side 253 upper surfaces of plastic frame, at this sinusoidal diverse location the light that LED22 sends is carried out different reflections.Concrete principle of reflection is, at LED 22 places, because light is strong, so corresponding to sinusoidal crest place, there is the effect of similar convex mirror at the crest place, makes light obtain strong reflection, and light is reflected to other positions, and this place light is weakened; And unnecessary light is reflected to the position, interval of LED 22, and this light that departs from LED 22 positions is strengthened.By this principle of reflection, the light that makes LED 22 send has obtained redistribution, and it is comparatively even to distribute, and preferably spot light is converted into area source, thereby has played the purpose of improving the liquid crystal panel display quality.

Fig. 5 is the perspective view of the utility model backlight second embodiment, as shown in Figure 5, be set at the upper surface of the second side 353 of plastic frame 35 on the basis of reflecting surface of wave curve shape, the lower surface of the first side 351 of plastic frame 35 also can also be set to the reflecting surface of the reflecting surface of wave curve shape such as sinusoidal shape, and the crest of this sine curve face is relative with LED 32.Can play better peptizaiton to the light that LED 32 sends like this, spot light is converted into area source, improve the some light leakage phenomena better.

The foregoing description backlight has improved the intensity of Liquid Crystal Module by adopting the incorporate structure of plastic frame, effectively reduces cost; And the lower surface of plastic frame is designed to sinusoidal shape, preferably spot light is converted into area source, solved the problem of liquid crystal panel display quality difference.

It should be noted that at last: above embodiment is only in order to explanation the technical solution of the utility model but not limit it, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement the technical solution of the utility model, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solutions of the utility model.

Claims

1, a kind of backlight, comprise LGP and a plurality of light emitting diode, it is characterized in that, also comprise the plastic frame that is used for the light that described light emitting diode sends is reflexed to described LGP, described plastic frame comprises first side, fillet and the second side that links to each other and be structure as a whole successively, described first side is near liquid crystal panel, described second side is relative with the position, first side, described fillet is connected between described second side and the first side, and the end of described LGP is between described first side and second side; Described light emitting diode is fixed on the described fillet.

2, backlight according to claim 1 is characterized in that, the upper surface of the second side of described plastic frame is the reflecting surface of wave curve shape, and the crest of described reflecting surface is relative with described light emitting diode.

3, backlight according to claim 2 is characterized in that, the lower surface of the first side of described plastic frame also is the reflecting surface of wave curve shape, and the crest of described reflecting surface is relative with described light emitting diode.

According to claim 2 or 3 described backlights, it is characterized in that 4, described wave curve is a sine curve.

5, backlight according to claim 4 is characterized in that, the width of the reflecting surface of described sinusoidal shape is 25mm at least.