CN102889500A - Backlight module and liquid crystal display using same - Google Patents
Backlight module and liquid crystal display using same Download PDFInfo
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- CN102889500A CN102889500A CN2011102020858A CN201110202085A CN102889500A CN 102889500 A CN102889500 A CN 102889500A CN 2011102020858 A CN2011102020858 A CN 2011102020858A CN 201110202085 A CN201110202085 A CN 201110202085A CN 102889500 A CN102889500 A CN 102889500A
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Abstract
The invention discloses a backlight module and a liquid crystal display using the backlight module. The backlight module comprises a light guide plate and a light source module. The light guide plate comprises a first side and a second side tangent with the first side. The light source module is configured beside the first side and the second side of the light guide plate; and a plurality of first light emitting diode units and a plurality of second light emitting diode units are respectively configured on the light source module facing toward the first side and the second side of the light guide plate. Therefore, the backlight module has the advantages of high image contrast of the direct type backlight module and electricity conservation, and the thickness of the side backlight module is kept.
Description
Technical field
The invention relates to a kind of light source module, and particularly relevant for a kind of backlight module and the liquid crystal display that uses this backlight module.
Background technology
With regard to display device now, have that high image quality, space utilization efficient are good, the liquid crystal display (liquid crystal display device) of low consumpting power, the characteristic such as radiationless become the market mainstream.Liquid crystal display is used on the display screen of the consumption electronic products such as TV, intelligent mobile phone and mobile computer in a large number.Yet, because display panels itself does not have luminous function, therefore to provide enough light sources at the rear of display panels, allow display panels can reach the purpose of show image.
The backlight module that is used on the liquid crystal display is divided into two kinds haply: direct type backlight module and side type backlight module.Direct type backlight module mainly utilizes many light emitting diodes (light emitting diode, LED) the monomer uniform spreading rear of being located at display panels is with as light source, and see through diffuser plate the light that above-mentioned light source sends is evenly dispersed, so that the area source of higher brightness to be provided.Directly inject user's eyes because the light that direct type backlight module is launched can pass through display panels, therefore need long light mixing distance to allow light mix, cause the required thickness of liquid crystal display to increase.
Comparatively speaking, side type backlight module then is the side of light source shelf being located at display panels, and see through LGP the light that light source sends is mixed, enter again user's eyes after making it become an area source, so adopt side type backlight module can reduce the required thickness of liquid crystal display.
Compare the two pluses and minuses, although side type backlight module can reduce the thickness of Integral back optical module, direct type backlight module can cooperate image processing chip, brightness algorithm or can come local adjustment to show the brightness of block for the time schedule controller of resolving presentation content.In other words, because each light source of direct type backlight module is dispersed in each viewing area under the display panels, therefore can allow easily each viewing area have in various degree brightness, so that direct type backlight module can have better image contrast, and can save the electric power that light source is excessively dispersed.Comparatively speaking, side type backlight module is difficult to allow the brightness difference to some extent of each viewing area, therefore can't arrange in pairs or groups image processing chip and brightness algorithm and reaches above-mentioned purpose.
Summary of the invention
The object of the present invention is to provide a kind of backlight module and the liquid crystal display that uses it, it possesses high image contrast that direct type backlight module is arranged and the advantage of power saving, and has kept the thickness of side type backlight module.
For achieving the above object, backlight module provided by the invention comprises:
One LGP has one first side and one second side tangent with this first side; And
One light source module, be disposed at by this first side and this second side of this LGP, wherein this light source module disposes respectively a plurality of the first light emitting diodes and a plurality of the second light emitting diode in this first side and this second side part towards this LGP.
Described backlight module, comprising: a LED driving module is coupled to this light source module, to control respectively the brightness of those first light emitting diodes and those the second light emitting diodes.
Described backlight module, wherein this LGP is divided into a plurality of subregions, respectively corresponding those first light emitting diodes of each subregion one of them and those second light emitting diodes one of them, and this LED driving module is dynamically adjusted one of them the brightness of those first light emitting diodes corresponding to each subregion one of them and those second light emitting diodes according to the corresponding presentation content of each subregion.
Described backlight module, wherein the bearing of trend of the bearing of trend of this first side and this second side is mutually vertical.
Described backlight module, wherein this light source module is a L-type LED source bar.
Described backlight module, wherein those first light emitting diodes and/or those the second light emitting diodes comprise a red light-emitting diode, a green light LED and a blue light-emitting diode at least one of them.
Described backlight module comprising a reflector, be disposed at by this first side and this second side, and this light source module is between this reflector and this LGP.
Described backlight module comprising an optical diaphragm group, is disposed at an exiting surface of this LGP.
Described backlight module, wherein this optical diaphragm group comprise a diffusion sheet, a brightening piece and a prismatic lens at least one of them.
Liquid crystal display provided by the invention comprises:
One backlight module comprises:
One LGP has one first side and one second side tangent with this first side; And
One light source module, be disposed at by this first side and this second side of this LGP, wherein this light source module disposes respectively a plurality of the first light emitting diodes and a plurality of the second light emitting diode in this first side and this second side part towards this LGP; And
One display panels is disposed at an exiting surface of this LGP.
Described liquid crystal display, wherein this backlight module comprises: a LED driving module is coupled to this light source module, to control respectively the brightness of those first light emitting diodes and those the second light emitting diodes.
Described liquid crystal display, wherein this display panels and this LGP are divided into a plurality of subregions, respectively corresponding those first light emitting diodes of each subregion one of them and those second light emitting diodes one of them, and this LED driving module according to the shown displaying contents of this display panels in each subregion with one of them the brightness of those first light emitting diodes corresponding to each subregion of dynamic adjustment one of them and those second light emitting diodes.
Described liquid crystal display, wherein the bearing of trend of the bearing of trend of this first side and this second side is mutually vertical.
Described liquid crystal display, wherein this light source module is a L-type LED source bar.
Described liquid crystal display wherein those first light emitting diodes and/or those the second light emitting diodes comprise a red light-emitting diode, a green light LED and a blue light-emitting diode at least one of them.
Based on above-mentioned, the other L-type LED source bar that disposes in the second side that the backlight module of the embodiment of the invention is tangent with it in the first side of LGP.Thus, liquid crystal display just can be controlled respectively the light emitting diode of horizontal direction on the L-type LED source bar (for example the first side) and vertical direction (for example the second side), corresponding brightness with each viewing area on the dynamic adjustment liquid crystal display, backlight module of the present invention can be possessed the high image contrast of direct type backlight module and the advantage of power saving, and keeps the thickness of side type backlight module.
Description of drawings
Fig. 1 is the top view of the backlight module that illustrates according to first embodiment of the invention.
Fig. 2 is the generalized section of the backlight module that illustrates according to the vertical section line I-I ' of Fig. 1.
Fig. 3 is the profile of the liquid crystal display that illustrates according to first embodiment of the invention.
Fig. 4 is the schematic top plan view of the liquid crystal display that illustrates according to first embodiment of the invention.
Fig. 5 to Fig. 7 is the top view of the backlight module that the second to the 4th embodiment illustrates according to the present invention.
Primary clustering symbol description in the accompanying drawing:
100,500,600,700 backlight modules; 110,510,610,710 LGPs; 112,512 top side/incidence surfaces; 114,614 left side/incidence surfaces; 514,714 right-hand side/incidence surfaces; 612,712 below side/incidence surfaces; 120,520,620,720 light source modules; 122,124 LED source bars; 130 LED driving modules; 210 base plates; 212 exiting surfaces; 220 reflectors; 230 optical diaphragm group; 250 light; 300 liquid crystal displays; 310 display panels; 312 area sources; DH1～DHm, DV1～DVn light emitting diode; I-I ' vertical section line; The GND ground voltage; H1V1～HmVn subregion.
The specific embodiment
The present invention proposes a kind of backlight module, and it mainly is made of a LGP and a light source module.This LGP has one first side and one second tangent side of the first side therewith.Light source module then is disposed at by first side and the second side of LGP, and light source module disposes respectively a plurality of the first light emitting diodes and a plurality of the second light emitting diode in the first side and the second side part towards LGP.
In one embodiment of this invention, above-mentioned backlight module can also include a LED driving module.This LED driving module is coupled to light source module, and can control respectively the brightness of above-mentioned the first light emitting diode and above-mentioned the second light emitting diode.According to above-mentioned, LGP can be distinguished into a plurality of subregions according to the relative position relation of the first light emitting diode and the second light emitting diode, and every sub regions is respectively corresponding one of them first light emitting diode and one of them the second light emitting diode then.Therefore, LED driving module just can according to every sub regions the corresponding presentation content that shows dynamically adjust the brightness of corresponding the first light emitting diode of this subregion and the second light emitting diode.
In one embodiment of this invention, the bearing of trend of the first side should be mutually vertical with the bearing of trend of the second side.In addition, in the embodiment of the invention, light source module can be L-type LED source bar (light bar).
In one embodiment of this invention, above-mentioned light emitting diode can be red light-emitting diode, green light LED and/or blue light-emitting diode, or the white light source that behind mixed light, forms of mentioned kind light emitting diode, also can be for other kind and in order to the light emitting diode as back light.
In one embodiment of this invention, backlight module can also include a reflector.This reflector is disposed at by the first side and the second side, and can make the light source module position between reflector and LGP.
In one embodiment of this invention, backlight module also comprises an optical diaphragm group, and it is configurable by the exiting surface of LGP.And these optical diaphragm group can be any combination of optical profile type diffusion sheet, brightening piece or prismatic lens one or mentioned kind blooming piece wherein.
The present invention proposes a kind of liquid crystal display in addition, and it mainly is made of above-mentioned backlight module and a display panels.Backlight module includes a LGP and a light source module.This LGP has one first side and one second tangent side of the first side therewith.Light source module then is disposed at by first side and the second side of LGP, and light source module is disposing respectively a plurality of the first light emitting diodes and a plurality of the second light emitting diode towards the first side of LGP and the place of the second side.Display panels then is disposed at by the exiting surface of LGP, with by area source that above-mentioned backlight module was provided as its display light source.And all the other implementation details of backlight module please refer to above-mentioned explanation in this liquid crystal display.
Based on above-mentioned, the other L-type LED source bar that disposes in the second side that the backlight module of the embodiment of the invention is tangent with it in the first side of LGP.Thus, liquid crystal display just can be controlled respectively the light emitting diode of horizontal direction on the L-type LED source bar (for example the first side) and vertical direction (for example the second side), corresponding brightness with each viewing area on the dynamic adjustment liquid crystal display, the high image contrast who the described backlight module of present embodiment can be possessed direct type backlight module is arranged and the advantage of power saving, and keep the thickness of side type backlight module.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate institute's accompanying drawing to be described in detail as follows.
Now will in detail with reference to example embodiment of the present invention, the example of described example embodiment be described in the accompanying drawings.In addition, all possibility parts, the assembly/member of use same numeral/identical or similar portions of symbology in drawings and the embodiments.
Please refer to Fig. 1, Fig. 1 is the top view of the backlight module 100 that illustrates according to first embodiment of the invention.Fig. 2 is the generalized section of the backlight module 100 that illustrates according to the vertical section line I-I ' of Fig. 1.In order to make clear its feature that shows of icon, the top view of Fig. 1 will omit part assembly (for example base plate 210, reflector 220 and optical diaphragm group 230), and these assemblies will be illustrated among Fig. 2.
Please be simultaneously with reference to Fig. 1 and Fig. 2, backlight module 100 comprises LGP 110, light source module 120 and LED driving module 130.LGP 110 for example is to be disposed on the base plate 210, and LGP 110 has side 112, top and the left side 114 tangent with side, top 112, and the bearing of trend of side, top 112 can be mutually vertical with the bearing of trend of left side 114.Side 112, top and left side 114 are all the incidence surface of LGP 110, and in brief, the LGP 110 that discloses in the present embodiment should have two incidence surfaces at least.
120 of light source modules are disposed at by the incidence surface of LGP 110, that is light source module 120 is disposed at side 112, top and left side 114 is other.In present embodiment, light source module 120 can be the LED source bar of L-type, is called LED source bar 122 at this horizontal component with L-type LED source bar, and its vertical component then is called LED source bar 124.In part embodiment, light source module 120 also can be in the face of the LED source bar 122 of the side, top 112 of LGP 110 and in the face of the set of the LED source bar 124 of the side 114 of LGP 110.That is to say that LED source bar 122 and LED source bar 124 can be collectively referred to as light source module 120.
The LED source bar 122 of light source module 120 place of side 112 above in the face of LGP 110 disposes a plurality of first light emitting diode DH1～DHm, and, the LED source bar 124 of light source module 120 then disposes a plurality of second light emitting diode DV1～DVn in the place of the left side 114 of facing LGP 110, and wherein m and n are all the positive integer greater than 1.The detailed construction of backlight module 100 for the purpose of simplifying the description, at this with through the vertical section line I-I ' of the first light emitting diode DH3 and Fig. 2 as an example, so that this backlight module 100 and first light emitting diode DH1～DHm to be described.Vertical cross section through second light emitting diode DV1～DVn in the backlight module 100 is then similar with Fig. 2, therefore no longer repeats to give unnecessary details.
Please continue with reference to figure 1 and Fig. 2, and with the first light emitting diode DH3 as an example.The light 250 that the first light emitting diode DH3 sends can be converted to an area source (not illustrating) by the effect of LGP 110 after entering side 112, and sees through exiting surface 212 outputs.The described light emitting diode DH1～DHm of the embodiment of the invention and DV1～DVn for example are red light-emitting diode, green light LED or blue light-emitting diode, or also can be the white light source that the mentioned kind light emitting diode forms behind mixed light, or other can be in order to the light emitting diode as back light.
Because the light of light emitting diode output directive property is better than general employed cathode fluorescent tube, so present embodiment uses light emitting diode can allow as light source to have better coupling efficiency between light emitting diode DH1～DHm, DV1～DVn and the LGP 110.In order further to promote the light source utilization rate, present embodiment also optionally disposes reflector 220 in the incidence surface of LGP 110, and light source module 120 is arranged between reflector 220 and the LGP 110, make the light that light emitting diode DH1～DHm, DV1～DVn send (for example light emitting diode DH3 launch light 250) can be via entering in the LGP 110 after reflector 220 reflections.
In addition, the exiting surface 212 other optical diaphragm group 230 that also may be configured with of LGP 110 are to improve light source briliancy and the light uniformity of backlight module 100.Above-mentioned optical diaphragm group 230 can be the combination of diffusion sheet, brightening piece, prismatic lens or above-mentioned those kind blooming pieces.In addition, get back to Fig. 1, LED driving module 130 is coupled to light source module 120, and it can control respectively the brightness of first light emitting diode DH1～DHm and second light emitting diode DV1～DVn.
Fig. 3 is the profile of the liquid crystal display 300 that illustrates according to first embodiment of the invention, and liquid crystal display 300 is mainly formed by above-mentioned backlight module 100 and display panels 310 construction.Display panels 310 is disposed at exiting surface 212 tops of the LGP 110 described in Fig. 2, to utilize area source 312 that backlight module 100 provided as its display light source.
In this, structure by above-mentioned backlight module 100, use the liquid crystal display 300 of this backlight module 100 can utilize image processing chip, brightness algorithm or can resolve the time schedule controller of presentation content, the presentation content that shows according to institute's wish on the display panels is come the brightness of the every sub regions of local adjustment, and in following explanation.Please be simultaneously with reference to Fig. 3 and Fig. 4, Fig. 4 is the schematic top plan view of the liquid crystal display 300 that illustrates according to first embodiment of the invention.For fear of display panels 310 and LGP are obscured, Fig. 4 has only illustrated display panels 310, and omits LGP 110 parts of Fig. 1.Therefore, only include light-emitting diode (LED) module 130 and light source module 120 in the backlight module 100 of Fig. 4.
In Fig. 4, this with single light emitting diode of single kind as light source module 120 in first light emitting diode DH1～DHm and the second light emitting diode for example, and illustrate for the circuit unit kenel to illustrate.The termination of these light emitting diodes DH1～DHm and DV1～DVn is received ground voltage GND, and its other end then is controlled by LED driving module 130.Yet, by above-described embodiment as can be known, light emitting diode DH1～DHm and DV1～DVn are except can the light emitting diode for single kind, can also be have a multiple types light emitting diode (for example, red, green and blue LED) and the white light source that can behind mixed light, form, so the circuit unit kenel of Fig. 4 and connection thereof are only for for example.
As shown in Figure 4, the LGP that do not illustrate of display panels 310 and its rear can be according to the arrangement mode of first light emitting diode DH1～DHm and second light emitting diode DV1～DVn and relative position relation and is divided into a plurality of subregion H1V1～HmVn.Respectively corresponding one of them the first light emitting diode DH1～DHm of every sub regions H1V1～HmVn and second light emitting diode DV1～DVn.For example, subregion H1V1 is corresponding to the first light emitting diode DH1 and the second light emitting diode DV1, and subregion H2V3 is then corresponding to the first light emitting diode DH2 and the second light emitting diode DV3, please the rest may be inferred.
In view of this, liquid crystal display 300 just can adopt for example image processing chip, brightness algorithm or can resolve the time schedule controller of presentation content ... wait the backlight illumination adjustment technology, so that every sub regions H1V1 in the foundation display panels 310～HmVn institute wish shows and corresponding presentation content is adjusted respectively the brightness of the corresponding first light emitting diode DH1～DHm of this subregion H1V1～HmVn and second light emitting diode DV1～DVn.Above-mentioned presentation content can for example be that Pixel Information shown among this subregion H1V1～HmVn, gamut range, light and shade contrast or other can be for the relevant informations of backlight illumination adjustment technology institute reference.
Below for example with as a reference, suppose that at this each light emitting diode DH1～DHm and DV1～DVn have redness, green and blue light emitting diode.If the corresponding presentation content of subregion H1V1 and Pixel Information thereof major part is blue in the display panels 310, then can come by above-mentioned backlight illumination adjustment technology the LED driving module 130 of control chart 4, to increase the brightness of blue LED among the first light emitting diode DH1 and the second light emitting diode DV1, and can slightly weaken the brightness of the light emitting diode of other color, so that liquid crystal display 300 can also can reach electricity saving function when having the height color contrast.
And if the corresponding presentation content major part of subregion H3V3 is shown in red, also can be come by above-mentioned backlight illumination adjustment technology the LED driving module 130 of control chart 4, increasing the brightness of red light emitting diodes among the first light emitting diode DH3 and the second light emitting diode DV3, and can slightly weaken the brightness of the light emitting diode of other color.In other embodiment, also can control LED driving module 130 by the corresponding presentation content of subregion H1V1～HmVn, suitable brightness algorithm and the hardware structure of cooperation, can dynamically adjust the brightness of every sub regions H1V1～HmVn, not repeat them here.
It is worth mentioning that, the incidence surface that the backlight module 100 of Fig. 1 discloses LGP 110 is positioned at the side 112 of LGP 110 tops and the side 114 of left thereof, therefore the L-type LED source bar that just illustrates for Fig. 1 of light source module 120, however the embodiment of the invention is not restricted to this.Fig. 5 to Fig. 7 is the backlight module 500 that the second to the 4th embodiment illustrates according to the present invention, 600 and 700 top view.
Please refer to Fig. 5 to Fig. 7, the second to the 4th embodiment and above-mentioned the first embodiment are similar, difference is that the incidence surface of the backlight module 500 announcement LGPs 510 of Fig. 5 is positioned at side, top 512 and the right-hand side 514 thereof of LGP 110, the incidence surface that the backlight module 600 of Fig. 6 discloses LGP 610 is positioned at side, below 612 and the left side 614 thereof of LGP 710, and the incidence surface that the backlight module 700 of Fig. 7 discloses LGP 710 is positioned at side, below 712 and the right-hand side 714 thereof of LGP 710, so light source module 520 of above-mentioned the second to the 4th embodiment, 620 and 720 also can be all with the position of change L-type LED source bar, be familiar with that this technical field person should class be pushed into the second embodiment to the four embodiment according to the content of the first embodiment, do not repeat them here.
In sum, the backlight module of the embodiment of the invention second side other light source module that dispose L-type tangent with it in the first side of LGP.Thus, because LED source has good light output directive property, liquid crystal display just can be controlled respectively the light emitting diode of the first side and the second side in the L-type LED source bar, corresponding brightness with every sub regions on the dynamic adjustment liquid crystal display, the high image contrast who the described backlight module of present embodiment can be possessed direct type backlight module is arranged and the advantage of power saving, and possess simultaneously the thickness of side type backlight module.
Although the present invention discloses as above with embodiment; so it is not to limit the present invention; have in the technical field under any and usually know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so the content that protection scope of the present invention should be defined with the claim scope of application is as the criterion.
Claims (15)
1. backlight module comprises:
One LGP has one first side and one second side tangent with this first side; And
One light source module, be disposed at by this first side and this second side of this LGP, wherein this light source module disposes respectively a plurality of the first light emitting diodes and a plurality of the second light emitting diode in this first side and this second side part towards this LGP.
2. backlight module according to claim 1 wherein, comprising:
One LED driving module is coupled to this light source module, to control respectively the brightness of those first light emitting diodes and those the second light emitting diodes.
3. backlight module according to claim 2, wherein, this LGP is divided into a plurality of subregions, respectively corresponding those first light emitting diodes of each subregion one of them and those second light emitting diodes one of them, and this LED driving module is dynamically adjusted one of them the brightness of those first light emitting diodes corresponding to each subregion one of them and those second light emitting diodes according to the corresponding presentation content of each subregion.
4. backlight module according to claim 1, wherein, the bearing of trend of the bearing of trend of this first side and this second side is mutually vertical.
5. backlight module according to claim 1, wherein, this light source module is a L-type LED source bar.
6. backlight module according to claim 1, wherein, those first light emitting diodes and/or those the second light emitting diodes comprise a red light-emitting diode, a green light LED and a blue light-emitting diode at least one of them.
7. backlight module according to claim 1 wherein, comprises a reflector, be disposed at by this first side and this second side, and this light source module is between this reflector and this LGP.
8. backlight module according to claim 1 wherein, comprises an optical diaphragm group, is disposed at an exiting surface of this LGP.
9. backlight module according to claim 8, wherein, this optical diaphragm group comprise a diffusion sheet, a brightening piece and a prismatic lens at least one of them.
10. liquid crystal display comprises:
One backlight module comprises:
One LGP has one first side and one second side tangent with this first side; And
One light source module, be disposed at by this first side and this second side of this LGP, wherein this light source module disposes respectively a plurality of the first light emitting diodes and a plurality of the second light emitting diode in this first side and this second side part towards this LGP; And
One display panels is disposed at an exiting surface of this LGP.
11. liquid crystal display according to claim 10, wherein, this backlight module comprises:
One LED driving module is coupled to this light source module, to control respectively the brightness of those first light emitting diodes and those the second light emitting diodes.
12. liquid crystal display according to claim 11, wherein, this display panels and this LGP are divided into a plurality of subregions, respectively corresponding those first light emitting diodes of each subregion one of them and those second light emitting diodes one of them, and this LED driving module according to the shown displaying contents of this display panels in each subregion with one of them the brightness of those first light emitting diodes corresponding to each subregion of dynamic adjustment one of them and those second light emitting diodes.
13. liquid crystal display according to claim 10, wherein, the bearing of trend of the bearing of trend of this first side and this second side is mutually vertical.
14. liquid crystal display according to claim 10, wherein, this light source module is a L-type LED source bar.
15. liquid crystal display according to claim 10, wherein, those first light emitting diodes and/or those the second light emitting diodes comprise a red light-emitting diode, a green light LED and a blue light-emitting diode at least one of them.
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| CN2011102020858A CN102889500A (en) | 2011-07-19 | 2011-07-19 | Backlight module and liquid crystal display using same |
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| CN2011102020858A CN102889500A (en) | 2011-07-19 | 2011-07-19 | Backlight module and liquid crystal display using same |
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Cited By (1)
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| CN110308588A (en) * | 2019-06-28 | 2019-10-08 | 厦门天马微电子有限公司 | A kind of backlight module and display device |
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Application publication date: 20130123 |