CN101178511A - Back light module unit and LCD device - Google Patents

Abstract

The invention relates to a BLU and a liquid crystal display device adopting the BLU. The BLU comprises a plurality of light sources and a light mixing plate, and all the light sources respectively can send out light with different color, and the light mixing plate is near to a plurality of the light sources, and the side thereof near to the light sources is provided with a plurality of groove structures. The BLU adopting the light mixing plate and the liquid crystal display device have thin thickness and small volume under the condition of meeting light mixing requirement.

Description

Module backlight and liquid crystal indicator

Technical field

The present invention relates to a kind of module backlight and the liquid crystal indicator that adopts this module backlight.

Background technology

Please refer to Fig. 1, is a kind of partial cutaway schematic of prior art liquid crystal indicator.This liquid crystal indicator 2 comprises aliquid crystal panel 24, onemodule 20 backlight and a glue frame 21.Thesemodule 20 adjacent theseliquid crystal panels 24 backlight, and provide planar light for this liquid crystal panel 24.Thisglue frame 21 is accommodated thismodule 20 backlight, and supports thisliquid crystal panel 24.

The rectangle framework that thisglue frame 21 is uncovereds, it comprises abase plate 211 and a plurality ofsidewalls 212, thisbase plate 211 and these 212 vertical linking to each other of sidewall form a receiving space.

Thismodule 20 backlight is down straight aphototropism mode set, and it comprises a plurality of red, green, blue light emitting diodes (light emitting diode, LED) 23, onereflector plate 25 and a diffusion sheet 29.These a plurality oflight emitting diodes 23 are arranged on thisbase plate 211, and thesediffusion sheet 29 contiguous theseliquid crystal panels 24 are provided with, and thesereflector plate 25 contiguous thesebase plates 211 are provided with.Form a mixed light space 295 between thisreflector plate 25 and this diffusion sheet 29.Thisreflector plate 25 comprises a plurality of throughholes 251, and these a plurality of throughholes 251 correspond respectively to this a plurality of light emitting diodes 23.These a plurality of red, green, bluelight emitting diodes 23 are provided with successively at interval, eachlight emitting diode 23 comprises abase 231 and anilluminating part 233, thisilluminating part 233 protrudes in thisreflector plate 25 via the throughhole 251 of thisreflector plate 25, thisbase 231 is positioned at thisreflector plate 25 belows, and supports thisilluminating part 233.

Red, green, blue three a coloured light part of sending from these a plurality oflight emitting diodes 23 is thisdiffusion sheet 29 of directive directly, thisreflector plate 25 of another part directive, and after thesereflector plate 25 reflections, thisdiffusion sheet 29 of directive again.Therebetween, these red, green, blue three coloured light overlap in this mixed light space 295 and mix.

In order to reach better display quality, this liquid crystal indicator 2 needs fully to mix these red, green, blue three coloured light, to obtain sufficient white light.If this mixed light space 295 is less, then cause mixed light insufficient, present inclined to one side Huang or blue partially through mixed light, thereby make the display quality of this liquid crystal indicator 2 descend.The common improvement method of industry is to adoptthicker glue frame 21, to obtain sufficient mixed light space 295.But this way makes thismodule 20 backlight obviously increase with liquid crystal indicator 2 thickness that adopt thismodule 20 backlight, can not satisfy the application demand of having relatively high expectations to lightening.

Summary of the invention

In order to solve in the prior art, be necessary to provide the module backlight that a kind of mixed light effect is better and volume is less to abundant mixed light causes the excessive problem of module volume backlight.

In addition, in order to solve in the prior art, also be necessary to provide the liquid crystal indicator that a kind of mixed light effect is better and volume is less to abundant mixed light causes the excessive problem of liquid crystal indicator volume.

A kind of module backlight, it comprises a plurality of light sources and a light mixing plate.These a plurality of light sources can send the light of different colours respectively.Contiguous these a plurality of light sources of this light mixing plate, and its contiguous these a plurality of light source one sides have a plurality of groove structures.

A kind of liquid crystal indicator, it comprises the module backlight of a liquid crystal panel and adjacent this liquid crystal panel.This module backlight comprises a plurality of light sources and a light mixing plate.These a plurality of light sources can send the light of different colours respectively.Contiguous these a plurality of light sources of this light mixing plate, and its contiguous these a plurality of light source one sides have a plurality of groove structures.

Compared with prior art, this module backlight utilizes light mixing plate and a plurality of groove structures on it, the light that these a plurality of light sources are sent reflects, the refract light of being dispersed, the space horizontal expansion that this refract light of dispersing mixes in this light mixing plate also enlarges, and does not therefore need by increasing the thickness of this module backlight, increase the blending space of different colours light, only need compact framework and module backlight, can satisfy the requirement of mixed light, liquid crystal indicator is evenly shown.

Description of drawings

Fig. 1 is a kind of partial cutaway schematic of prior art liquid crystal indicator.

Fig. 2 is the partial cutaway schematic of liquid crystal indicator first embodiment of the present invention.

Fig. 3 is the schematic perspective view of the light mixing plate of liquid crystal indicator shown in Figure 2.

Fig. 4 is the light path synoptic diagram of the module backlight of liquid crystal indicator shown in Figure 2.

Fig. 5 is the cut-open view of the module backlight of liquid crystal indicator second embodiment of the present invention.

Fig. 6 is the schematic partial cross-sectional view of liquid crystal indicator the 3rd embodiment of the present invention.

Embodiment

Please refer to Fig. 2, is the partial cutaway schematic of liquid crystal indicator first embodiment of the present invention.This liquid crystal indicator 4 comprises a liquid crystal panel 44, one module 40 backlight and a framework 41, these module 40 adjacent these liquid crystal panels 44 backlight are provided with, and for this liquid crystal panel 44 provides planar light, this framework 41 is accommodated this module 40 backlight and is supported this liquid crystal panel 44.

The rectangle framework that this framework 41 is uncovereds, it comprises a base plate 411 and a plurality of sidewalls 412, these a plurality of sidewalls 412 and these 411 vertical linking to each other of base plate form a receiving space.

This module 40 backlight is down straight aphototropism mode set, and it comprises a plurality of red, green, blue light emitting diodes 43, a reflector plate 45, alight mixing plate 47 and a diffusion sheet 49.These a plurality of light emitting diodes 43 are arranged on the base plate 411 of this framework 41, and these reflector plate 45 contiguous these base plates 411 are provided with, and this liquid crystal panel 44, this diffusion sheet 49 are cascading with this light mixing plate 47.Form a mixed light space 495 between thislight mixing plate 47 and this reflector plate 45, this mixed light space 495 can tentatively be mixed therein for red, green, blue three coloured light that this light emitting diode 43 sends.The refractive index of thislight mixing plate 47 is greater than the refractive index of air in this mixed light space 495.This reflector plate 45 comprises a plurality of through holes 451, and this through hole 451 corresponds respectively to this light emitting diode 43.These a plurality of red, green, bluelight emitting diodes 23 are provided with successively at interval, each light emitting diode 43 comprises a base 431 and an illuminating part 433, this illuminating part 433 protrudes in this reflector plate 45 via the through hole 451 of this reflector plate 45, this base 431 is positioned at this reflector plate 45 belows, and supports this illuminating part 433.

, be the schematic perspective view of thelight mixing plate 47 of liquid crystal indicator 4 shown in Figure 2 please in the lump with reference to figure 3.Thislight mixing plate 47 is a transparent plate structure, and it comprises thelower surface 470 of contiguous this reflector plate 45.Thislower surface 470 has a plurality of grooves that cave inward 471, and it is an arcuate structure.These a plurality ofgrooves 471 correspond respectively to this a plurality of light emitting diodes 43.

, be the light path enlarged diagram of module backlight 40 parts of this liquid crystal indicator 4 please in the lump with reference to figure 4.Red, green, blue three coloured light that send from these a plurality of light emitting diodes 43, part is thislight mixing plate 47 of directive directly, this reflector plate 45 of another part directive, and after these reflector plate 45 reflections thislight mixing plate 47 of directive again.These red, green, blue three coloured light are in theselight mixing plate 47 communication processes, and existing part light overlaps in this mixed light space 495 and mixes mutually.When thislight mixing plate 47 of light directive, part light enters thislight mixing plate 47 via thesegroove 471 refractions, enters thislight mixing plate 47 after flat (not label) refraction of another part light via theselight mixing plate 47 lower surfaces 470.Because of the refractive index of thislight mixing plate 47 refractive index greater than air in this mixed light space 495, light is injected thislight mixing plate 47 from this mixed light space 495, concave surface refraction through thisgroove 471, the refract light that enters thislight mixing plate 47 becomes and disperses, therefore, therefore the light that partly originally can not overlap can overlap and mix.And, each coloured light that in this mixed light space 495, does not mix fully, the also abundant mixing that can thislight mixing plate 47 in, further overlap, thus provide abundant mixed white light for this liquid crystal panel 2.

This liquid crystal indicator 2 utilizes a plurality ofgroove structures 471 of thislight mixing plate 47, and the light that makes each light emitting diode 43 inject thislight mixing plate 47 reflects, and this refract light is dispersed.The space horizontal expansion that the refract light of this different colours mixes in thislight mixing plate 47 also enlarges, thereby do not need to increase the blending space of different colours light by the thickness that increases this module 4 backlight, only need compact framework 41 and module 40 backlight, this liquid crystal indicator 4 is evenly shown.

Please refer to Fig. 5, is the cut-open view of the module backlight of liquid crystal indicator second embodiment of the present invention.Thismodule 60 backlight is side entrance back modules, and it comprises a plurality of red, green, blue light emitting diodes 63, alight mixing plate 67 and a light guide plate 69.The light that these a plurality of light emitting diodes 63 send enters thislight guide plate 69 after thislight mixing plate 67 is mixed.Thislight guide plate 69 comprises an incidence surface 691.Thislight mixing plate 67 is attached on theincidence surface 691 of thislight guide plate 69, and it has certain intervals with these a plurality of light emitting diodes 63, and the surface of its adjacent these a plurality of light emitting diodes 63 has a plurality ofgrooves 671 that cave inward.These a plurality of light emitting diodes 63 correspond respectively to this a plurality of grooves 671.Thismodule 60 backlight can obtain the preferable effect similar to this module backlight 40.

Please refer to Fig. 6, is the schematic partial cross-sectional view of liquid crystal indicator the 3rd embodiment of the present invention.This liquid crystal indicator 7 is similar substantially to this liquid crystal indicator 4, and its key distinction is: the light mixing plate 77 of this liquid crystal indicator 7 has a plurality of grooves 771 that cave inward, and the surface of this groove 771 also comprises a plurality of micro-recesses 7710 that cave inward.

The surface of this groove 771 also comprises a plurality of micro-recesses 7710, and the curvature of this groove 771 of the ratio of curvature of these a plurality of micro-recesses 7710 is bigger, make that reflecting the light that enters this light mixing plate 77 by this micro-recesses 7710 more disperses, thereby the light of different colours is further mixed in this light mixing plate 77.Therefore, can under the less situation of volume, finish required mixed light requirement by a reflector plate (figure does not show) with these light mixing plate 77 formed mixed light spaces.Thereby this liquid crystal indicator 7 can adopt the less framework of volume.

The invention is not restricted to above-mentioned embodiment, groove structure on this light mixing plate can also be the micro-recesses structure, the shape of this groove structure can change to some extent according to actual needs, as shapes such as V-arrangement, waveforms, as long as adopt the module backlight and the liquid crystal indicator of this light mixing plate to reach compact purpose.

Claims (10)

1. module backlight, it comprises a plurality of light mixing plate that can send light source and contiguous these a plurality of light sources of different colours light respectively, it is characterized in that: a side of contiguous these a plurality of light sources of this light mixing plate has a plurality of groove structures.

2. module backlight as claimed in claim 1 is characterized in that: a plurality of grooves of this light mixing plate are corresponding one by one with these a plurality of light source positions.

3. module backlight as claimed in claim 1 is characterized in that: these a plurality of light sources are the red, green, blue light emitting diode, and it is provided with successively at interval.

4. module backlight as claimed in claim 1 is characterized in that: this light mixing plate is the transparent plate structure, and its refractive index is greater than the refractive index of air.

5. module backlight as claimed in claim 1 is characterized in that: the surface of this groove is an arc.

6. module backlight as claimed in claim 5 is characterized in that: the surface of this groove also has a plurality of micro-recesses that cave inward.

7. module backlight as claimed in claim 6 is characterized in that: the curvature of these a plurality of micro-recesses is greater than the curvature of this groove.

8. module backlight as claimed in claim 1 is characterized in that: this module backlight is a down straight aphototropism mode set, and this module backlight also comprises the diffusion sheet of contiguous this light mixing plate.

9. module backlight as claimed in claim 1 is characterized in that: this module backlight is the side entrance back module, and this module backlight also comprises the light guide plate of adjacent this light mixing plate.

10. liquid crystal indicator, the module backlight that it comprises a liquid crystal panel and adjacent this liquid crystal panel is characterized in that: this module backlight is any described module backlight in the claim 1 to 9.

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