CN101701688A - Backlight unit - Google Patents
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- CN101701688A CN101701688A CN200910209695A CN200910209695A CN101701688A CN 101701688 A CN101701688 A CN 101701688A CN 200910209695 A CN200910209695 A CN 200910209695A CN 200910209695 A CN200910209695 A CN 200910209695A CN 101701688 A CN101701688 A CN 101701688A
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- led
- back light
- light unit
- emitting phosphor
- green emitting
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Abstract
A backlight unit is provided which includes a plurality of LEDs(110) for emitting light; a plurality of LED modules which comprises the printed circuit board supporting and driving a plurality of LEDs; a plurality of optical sheets adhered to the upper of a plurality of LED modules; and a plurality o radiation pads adhered to the rear side of a plurality of LED modules.
Description
The application is to be that July 21, application number in 2008 are 200810129908.7 the applying date, and name is called the dividing an application of Chinese patent application of " back light unit ".
The cross reference of related application
The application requires the priority to the 10-2007-0072266 korean patent application of Korea S Department of Intellectual Property submission on July 19th, 2007, and the priority of the 10-2008-0069033 korean patent application of submitting to Korea S Department of Intellectual Property on July 16th, 2008, the content of its disclosure is hereby expressly incorporated by reference.
Technical field
The present invention relates to use the back light unit of light emitting diode (LED) module.
Background technology
In recent years, along with the fast development of semiconductor technology, the performance of product is further enhanced and has reduced its size and weight simultaneously.The cathode ray tube (CRT) that still is used for information display device is in performance and have many advantages in price, but its miniaturization and portable aspect have restriction.As the device that is used to overcome this shortcoming, LCD (LCD) device has been proposed.Because the LCD device can reduce to some extent on size and weight and has low-power consumption, so the LCD device is considered to overcome the substitute of the shortcoming of CRT.At present, almost each needs the messaging device of display unit all to comprise LCD device mounted thereto.
In the LCD device, thereby the specific molecular that voltage is applied to liquid crystal arranged this molecules align is converted to another molecules align, and with the optical characteristics of liquid crystal cells (it is by luminous through the molecules align of conversion) (such as birefringence, rotation, double-colored character, and diffusion) on change be converted to the vision change.That is, the LCD device is a kind of like this display unit of using light modulation by liquid crystal cells.
Because the LCD device is the passive element that self can not be luminous, so use the back light unit that is attached to the liquid crystal panel back surfaces that this liquid crystal panel is thrown light on.By the light transmission of the signal of telecommunication regulator solution crystal panel that applies, and on liquid crystal panel, show static or mobile image.
Cold-cathode fluorescence lamp (CCFL) is widely used as employed lamp in the back light unit that light is provided to liquid crystal panel.Yet, in recent years, often will use the back light unit of LED to be used for various display unit such as mancarried device and field sequential color LCD device.
With reference to Fig. 1 in detail, the conventional backlight unit of using LED will be described.
Fig. 1 is the perspective view of conventional backlight unit.
As shown in Figure 1, conventional backlight unit is positioned at below the display floater (not shown) and comprises: a plurality of LED 110; A plurality of led modules 120 have the printed circuit board (PCB) (PCB) of supporting and driving a plurality of LED110; Optical sheet (optical sheet) 140, thus it is set at above a plurality of led modules 120 and led module 120 preset distances at interval; And cooling pad 130, it is set on the back surfaces of led module 120.
Construct conventional backlight unit in such a manner: make the optical sheet 140 and led module 120 interval preset distances that are arranged on above a plurality of led modules 120, and an optical sheet 140 covers all led modules 120.In this case, can divide cooling pad 130 on the back surfaces of led module 120 according to the number of led module 120, thereby this cooling pad can be attached to individually each led module 120, cover whole led modules 120 thereby perhaps can enclose a cooling pad 130.
Yet,, use this back light unit to realize that the minimizing on sized display and the thickness exists difficulty when the optical sheet with back light unit forms when making itself and led module spaced apart.
In addition, when the optical sheet that will be used to control light direction held and be fixed as plate that covers whole led modules, if any one led module damages, the optical sheet that then is positioned at above the led module will be removed fully.Therefore, doing over again of back light unit handled the complexity that becomes.
Summary of the invention
An advantage of the present invention is that it provides a kind of back light unit, wholely in this back light unit forms led module, is positioned at the optical sheet above the led module and is positioned at cooling pad below the led module, thereby reduce the size and the thickness of back light unit.
Other aspects and the advantage of total inventive concept of the present invention will partly be set forth in description subsequently, and partly will become apparent by description, perhaps can obtain by putting into practice total inventive concept.
According to an aspect of the present invention, back light unit comprises: luminous a plurality of light emitting diodes (LED); A plurality of led modules have the printed circuit board (PCB) (PCB) of supporting and driving a plurality of LED; A plurality of optical sheets, it is attached to the top surface of corresponding led module; And a plurality of cooling pads, it is attached to the back surfaces of corresponding led module.
Optical sheet and cooling pad can be formed and have same size.
Optical sheet and cooling pad can have the size less than led module.
Led module can be arranged as it is vertical parallel to each other.
Led module can be arranged as around presumptive area.
A plurality of LED can be arranged as triangle or rectangular shape continuously.
Can separate a plurality of LED for each piece according to circuit mode, thus some LED partly among a plurality of LED of On/Off.
According to an aspect of the present invention, back light unit comprises having a plurality of led modules and support that is used for luminous a plurality of LED and the printed circuit board (PCB) (PCB) that drives a plurality of LED, wherein, a plurality of led modules comprise a plurality of White LEDs of arranging according to matrix shape, and the center illumination of the LED unit of being made up of any LED that is placed according to beeline each other is corresponding to 80% to 120% of the mean value of the illumination of described LED, wherein, described matrix shape is formed more than reaching two row by two row are above.
A plurality of LED are arranged continuously according to triangle, and are arranged in the same column and a LED located adjacent one another and the distance between the 2nd LED are set in the scope of 20mm to 140mm.
A plurality of LED are arranged continuously according to triangle, and in the distance between the LED located adjacent one another on line direction or the column direction is set to scope at 8.2mm to 70mm.
A plurality of LED are arranged continuously according to rectangular shape, and the distance between the LED located adjacent one another is set in the scope of 8.2mm to 70mm.
A plurality of LED are arranged continuously according to rectangular shape, and form to arrange the column direction of LED to the scopes of 110 degree and place angle between the position of LED at 70 degree.
A plurality of led modules are divided into a plurality of separated from one another by printed circuit pattern according to circuit mode, thus On/Off LED independently.
According to an aspect of the present invention, back light unit comprises a plurality of LED that are used to launch white light, and have a plurality of led modules of supporting and driving the printed circuit board (PCB) (PCB) of a plurality of LED, wherein, distance between the LED located adjacent one another is set in the scope of 8.2mm to 70mm, and a plurality of led module is arranged as the presumptive area around core.
According to an aspect of the present invention, back light unit comprises a plurality of LED that are used to launch white light, and have a plurality of led modules of supporting and driving the printed circuit board (PCB) (PCB) of a plurality of LED, wherein, a plurality of LED comprise: have the led chip that dominant wavelength is 420nm-456nm; Red fluorescence powder excites red-emitting thereby place around the led chip and by led chip; And green emitting phosphor, exciting transmitting green light thereby place around the LED and by led chip, wherein a plurality of led modules are being more than four at least on the number and are being arranged as around presumptive area.
Red fluorescence powder can comprise nitride based red fluorescence powder or sulfide base red fluorescent powder.
Red fluorescence powder can comprise nitride based CaAlSiN
3: Eu red fluorescence powder or sulfide base (Ca, Sr) S:Eu red fluorescence powder.
Green emitting phosphor can comprise any one in silicate-base green emitting phosphor, sulfide base green emitting phosphor and the nitride based green emitting phosphor.
Green emitting phosphor can comprise having A
2SiO
4Or A
3SiO
5Composition the silicate-base green emitting phosphor, have SrGa
2S
4: the sulfide base green emitting phosphor of the composition of Eu and have in the nitride based green emitting phosphor of composition of Beta-SiAlON any one, wherein A can be Sr, Ba, Ca and Mg, and Sr is an indispensable element, can optionally comprise Ba, Ca, and Mg if necessary, and be satisfied with (summation of the composition of 0≤Ba, Ca, Mg≤1).
Description of drawings
By below in conjunction with the description of accompanying drawing to embodiment, these of total inventive concept of the present invention and/or other aspects and advantage will become apparent, and be more readily understood, in the accompanying drawing:
Fig. 1 is the perspective view of conventional backlight unit;
Fig. 2 is the perspective view according to back light unit of the present invention;
Fig. 3 shows the perspective view according to the arrangement of a plurality of LED in the back light unit of the first embodiment of the present invention;
Fig. 4 shows the plane of a plurality of arrangement in according to a second embodiment of the present invention the back light unit;
Fig. 5 shows the plane of the arrangement of a plurality of LED in according to a second embodiment of the present invention the back light unit;
Fig. 6 shows the plane of a plurality of arrangement in the back light unit of a third embodiment in accordance with the invention;
Fig. 7 shows the plane of the arrangement of a plurality of LED in the back light unit of a third embodiment in accordance with the invention;
Fig. 8 shows the image according to the brightness of back light unit of the present invention;
Fig. 9 is the plane according to back light unit of the present invention;
Figure 10 is the circuit diagram according to back light unit of the present invention; And
Figure 11 shows the perspective view according to another example of the arrangement of the led module in the back light unit of the present invention.
The specific embodiment
Present with detailed embodiment with reference to the total inventive concept of the present invention, the example shown in the drawings, wherein, identical in the text reference number is represented components identical.Below by describing embodiment with reference to the accompanying drawings to explain the total inventive concept of the present invention.
Hereinafter, with reference to the accompanying drawings back light unit according to the present invention is described in detail.
Fig. 2 is the perspective view of back light unit according to an embodiment of the invention.
As shown in Figure 2, back light unit 100 is positioned at below the display unit (not shown) and comprises according to an embodiment of the invention: luminous a plurality of LED 110; A plurality of led modules 120 have the printed circuit board (PCB) (PCB) of supporting and driving a plurality of LED 110; A plurality of optical sheets 140, it is attached to the top surface of corresponding led module 120; And a plurality of cooling pads 130, it is attached to the back surfaces of corresponding led module 120.
A plurality of LED 110 can realize white light.For example, a plurality of LED 110 can comprise the blue led chip and place red fluorescence powder and green emitting phosphor on this blue led chip.Replacedly, a plurality of LED 110 can comprise blue led chip, red LED chips and green LED chip.In this case, the blue led chip comprises the led chip with emission wavelength 250nm to 420nm and places blue colour fluorescent powder on this led chip.In addition, red LED chips and green LED chip comprise redness and the green emitting phosphor that places on the led chip with emission wavelength 250nm to 420nm.
For material as red fluorescence powder, can be with nitride based CaAlSiN
3: Eu, sulfide base (Ca, Sr) S:Eu etc. are as example.
For material, can 2,1, the 4 silicate-base A that form will be had as green emitting phosphor
2SiO
4, have 3,1, the 5 silicate-base A that form
3SiO
5, sulfide base SrGa
2S
4: Eu, and nitride based Beta-SiAlON is as example.For having 2,1,4 silicate-base fluorescent material (Sr, Ba, Ca, the Mg) 2SiO4:Eu that form, can use X.In this case, Sr is an indispensable element, can optionally comprise Ba, Ca if necessary, reach Mg (summation of the composition of 0≤Ba, Ca, Mg≤1).Eu is used as catalyst, and uses Eu2+.X is additive and can comprises at least a or multiple among Ho, Er, Ce, Y, F, Cl, Br, I, P, S, N and the Gd.Can in the scope of 1ppm to 500000ppm, regulate the doping of X.In addition, for having 3,1,5 silicate-base fluorescent material (Sr, Ba, Ca, the Mg) 3SiO5:Eu that form, can use X.In this case, Sr is an indispensable element, can optionally comprise Ba, Ca if necessary, reach Mg (summation of the composition of 0≤Ba, Ca, Mg≤1).Eu is used as catalyst, and uses Eu2+.X is additive and can comprises at least a or multiple among Ho, Er, Ce, Y, F, Cl, Br, I, P, S, N and the Gd.Can in the scope of 1ppm to 500000ppm, regulate the doping of X.
For material as blue colour fluorescent powder, can be with silicate-based material, sulfide sill, nitride based materials and aluminate-base material as example.
A plurality of led modules 120 comprise a plurality of LED 110 that arrange according to matrix shape, this matrix by m capable and n row form.In this case, a plurality of LED 110 that arrange according to m * n matrix can be divided into a plurality of.Herein, m and n are equal to or greater than 2 positive number.
Each led module 120 includes a plurality of.In this case, can divide a plurality of LED 110 with a plurality of LED of independent driving for each piece.
Similarly, can divide and drive back light unit 100 for each piece.
In addition, owing to suitably regulate the led module number, be included in any one in the led chip number of piece number in the led module and each piece, therefore can suitably regulate the required illumination of back light unit.
Particularly, description is depended on the back light unit size and selection that the led chip number of the piece number of LED proper number, led module number, each led module and each piece is carried out.
In this embodiment, with have respectively 40,46,52 and 57 inches size back light unit as an example.
At first, total illumination that can each back light unit size is required (lumen) is set to 7000,8000,93000 and 13000.As shown in Table 1, can depend on that the LED of unit illumination determines to satisfy the number of the led chip of total illumination.
Usually, use the LED of 4,8,10 and 15 lumens.Form 1 shows the required LED number of each back light unit size.
[form 1]
As shown in Table 1, depend on that the required LED number of the LED of unit illumination is can be slightly different.Consider that color uniformity and brightness need suitably arrange the LED of huge number like this, so that it has optical density.
In order to realize that easily the piece number of led module number, each module and the LED number of each piece are suitably selected in the zone and the arrangement of number, thereby obtain the brightness and the color uniformity of the best.
In order to satisfy the condition shown in the form 1, can select the piece number of led module number, each module in each back light unit size and the LED number of each piece as shown in Table 2.
[form 2]
| Back light unit size (inch) | ??40 | ??46 | ??52 | ??57 |
| The LED number | ??466-1750 | ??533-2000 | ??622-2325 | ??866-3250 |
| The led module number | ??6-12 | ??6-12 | ??6-12 | ??6-20 |
| The piece number of each module | ??4-14 | ??5-15 | ??6-28 | ??6-28 |
| The LED number of each piece | ??6-24 | ??6-24 | ??6-24 | ??6-24 |
With the situation of corresponding 40 inches and 46 inches of intermediate sizes under, can in identical scope, select the LED number of led module number and each piece.Under 40 inches situation, can construct back light unit according to the mode that led module is divided into 4-14 piece.Under 46 inches situation, can construct back light unit according to the mode that led module is divided into 5-15 piece.If necessary, can in form 2 shown scopes, suitably select the LED number of number of modules and each piece.
With the situation of corresponding 52 inches and 57 inches of large scale under, can in the scope of 6-28, select the piece number of each module, and can in the scope of 6-24, select the LED number of each piece.Preferably, under 52 inches situation, can in the scope of 6-12, select the led module number.Under 57 inches situation, can in the scope of 6-20, select the led module number.
That is, can in the scope of 2-28, select the led module number, and each module can be made of 1 to 28 piece.In addition, can in each piece, arrange 2 to 240 LED.
In this embodiment, led module number, piece number and LED number are not limited to this.
Each optical sheet 140 all has a plurality of and each LED 110 corresponding smooth beam orifices (light transmission hole) (not shown), thereby and be used for according to predetermined direction to incident light carry out diffusion or reflection can be functionally to display unit diffusion or irradiation by light that LED110 produced.
Therefore, can integrally form optical sheet 140 and led module 120, this makes the size and the thickness that reduce back light unit 100 become possibility.
The size of having described optical sheet 140 and cooling pad 130 in this embodiment equals the size of led module.Need not be confined to this, the size of optical sheet 140 and cooling pad 130 can be less than the size of led module.
Because optical sheet 140 is attached to each led module 120 individually, only selectivity is removed the optical sheet 140 of the led module 120 that is attached to the damage in a plurality of led modules 120, thereby replace or repairing damaged led module 120, this feasible subsequent treatment of handling such as doing over again of back light unit 100 becomes and becomes possibility easily.
In addition, can suitably select to have the led module number of optimal brightness and color uniformity, the piece number and the LED number of each led module, this makes suitably selects the number of optical sheet and cooling pad to become possibility.
Integrally form optical sheet 140, led module 120 and cooling pad 130, thereby realized reducing on the size of back light unit 100 and the thickness.In addition, optical sheet 140 is attached on each led module 120 individually, this makes easily back light unit 100 to be done over again becomes possibility.
In this embodiment, described for each piece and come separately optical sheet 140.Similar to optical sheet 140, can come separately reflecting plate for each piece.
As shown in Figure 2, on the led module 120 in a plurality of led modules 120 a plurality of LED are arranged as delegation.But, need not be confined to this, depend on that the characteristic of back light unit can be arranged a plurality of LED according to multiple shape.
Hereinafter, a plurality of examples that are opposite to the arrangement of the LED in the led module 120 with reference to the accompanying drawings are described.
Fig. 3 shows the perspective view according to the arrangement of a plurality of LED in the back light unit of the first embodiment of the present invention.
As shown in Figure 3, can on a led module 120 a plurality of LED 110 be arranged as two goes.That is, the characteristic that depends on back light unit can be arranged as delegation or multirow with a plurality of LED 110 on a led module 120.
Fig. 4 shows in according to a second embodiment of the present invention the back light unit plane of a plurality of arrangement.
Fig. 5 shows the plane of the arrangement of a plurality of LED in according to a second embodiment of the present invention the back light unit.
As shown in Figure 4, thus can arrange a plurality of LED 110 continuously on led module 120 has triangle.A plurality of LED 110 can be divided into a plurality of A to D, thereby drive back light unit 100 individually for each piece.Thereby each piece can be separated from each other and make its quilt On/Off independently, and will place the LED of each piece to couple together by printed circuit pattern.In this case, when producing little heat, if necessary, can omit the cooling pad on the lower surface of led module 120.
By regulating the arrangement of LED, back light unit 100 can have best uniformity.As shown in Figure 5, when LED 110 realized white light, LED 110 was separated from each other.In this case, the center illumination C of the LED unit U that is made up of any LED (its with beeline be placed) each other should be corresponding to 80% to 120% of the mean value of the illumination of LED, thereby back light unit 100 has best uniformity.
At this moment, first distance (a) that is placed between same row and a LED 110a located adjacent one another and the 2nd LED 110b can be set in the scope of 20mm to 140mm.In addition, the distance of the 3rd between the second distance (b) between a LED 110a and the 3rd LED 110c (it is adjacent to a LED and the 2nd LED on line direction) and the 2nd LED 110b and the 3rd LED 110c (e) can be set in the scope of 15mm to 90mm.In this case, second distance (b) and the 3rd distance (e) can be equal to each other, thereby back light unit 100 has best uniformity.First distance (a) should be greater than second distance (b) and the 3rd distance (e).
In addition, can with between a LED 110a located adjacent one another and the 3rd LED 110c between the distance on the column direction and the 2nd LED 110b located adjacent one another and the 3rd LED 110c the distance on line direction be set in the scope of 8.2mm to 70mm.
Fig. 6 shows the plane of a plurality of arrangement in the back light unit of a third embodiment in accordance with the invention.
Fig. 7 shows the plane of the arrangement of a plurality of LED in the back light unit of a third embodiment in accordance with the invention.
As shown in Figure 6, for example, can arrange a plurality of LED 110 on the led module 120 continuously according to square or rectangle.A plurality of LED 110 can be divided into a plurality of A to D, thereby drive back light unit individually for each piece.Thereby each piece can be separated from each other by On/Off independently, and will place the LED of each piece to couple together by printed circuit pattern.In this case, when producing little heat, if necessary, can omit the cooling pad on the lower surface of led module 120.
As shown in Figure 7, when with a plurality of LED of rectangular arranged, the center illumination C of the LED unit U that is made up of any LED (its with beeline be placed) each other should be corresponding to 80% to 120% of the mean value of the illumination of LED.For this structure, distance D between the adjacent LED 110 1 and D2 can be set in the scope of 8.2mm to 70mm.In addition, can form column direction (arrange LED110 direction) to the scopes of 110 degree and place angle between the position of LED at 70 degree.
In this LED arranges,, LED strengthens color reproducibility and brightness thereby should satisfying following condition.
In order to realize white light, led chip can comprise: having dominant wavelength is the blue led chip of 420nm-456nm; Red fluorescence powder excites red-emitting thereby place around the blue led chip and by the blue led chip; And green emitting phosphor, excite transmitting green light thereby place around the blue led and by the blue led chip.In this case, based on CIE 1931 chromaticity coordinates systems, should be positioned at by summit (0.6448 from the chromaticity coordinates of the ruddiness of red fluorescence powder emission, 0.4544), (0.8079,0.2820), (0.6427,0.2905) and (0.4794,0.4633) in institute's region surrounded, should be positioned at by summit (0.1270 from the chromaticity coordinates of the green glow of green emitting phosphor emission, 0.8037), (0.4117,0.5861), in (0.4197,0.5861) and (0.2555,0.5030) institute region surrounded.
Preferably, the FWMH of the emission spectrum of blue led chip (half maximum all-wave) changes from 10nm to 30nm, and the FWHM of green emitting phosphor changes from 30nm to 100nm, and the FWHM of red fluorescence powder changes from 50nm to 200nm.Therefore, may obtain to have the more remarkable color uniformity and the white light of quality.Particularly, because the dominant wavelength and the FWHM of blue led chip are limited in 420nm-456nm and 10nm-30nm respectively, might strengthen CaAlSiN3:Eu red fluorescence powder and (Sr, Ba, Ca, Mg) 2SiO4:Eu, the efficient of X green emitting phosphor (summation of the composition of 0≤Ba, Ca, Mg≤1).
As mentioned above, for material as red fluorescence powder, can be with nitride based CaAlSiN
3: Eu, sulfide base (Ca, Sr) S:Eu etc. are as example.
For material, can 2,1, the 4 silicate-base A that form will be had as green emitting phosphor
2SiO
4, have 3,1, the 5 silicate-base A that form
3SiO
5, sulfide base SrGa
2S
4: Eu, and nitride based Beta-SiAlON is as example.For having 2,1,4 silicate-base fluorescent material (Sr, Ba, Ca, the Mg) 2SiO4:Eu that form, can use X.In this case, Sr is an indispensable element, can optionally comprise Ba, Ca if necessary, reach Mg (summation of the composition of 0≤Ba, Ca, Mg≤1).Eu is used as catalyst, and uses Eu2+.X is additive and can comprises at least a or multiple among Ho, Er, Ce, Y, F, Cl, Br, I, P, S, N and the Gd.Can in the scope of 1ppm to 500000ppm, regulate the doping of X.In addition, for having 3,1,5 silicate-base fluorescent material (Sr, Ba, Ca, the Mg) 3SiO5:Eu that form, can use X.In this case, Sr is an indispensable element, can optionally comprise Ba, Ca if necessary, reach Mg (summation of the composition of 0≤Ba, Ca, Mg≤1).Eu is used as catalyst, and uses Eu2+.X is additive and can comprises at least a or multiple among Ho, Er, Ce, Y, F, Cl, Br, I, P, S, N and the Gd.Can in the scope of 1ppm to 500000ppm, regulate the doping of X.
For material as blue colour fluorescent powder, can be with silicate-based material, sulfide sill, nitride based materials and aluminate-base material as example.
Fig. 8 shows the image according to the brightness of back light unit of the present invention.As shown in Figure 8, when arranging a plurality of LED corresponding to 80% to 120% mode of the mean value of the illumination of LED, can find that this back light unit has best uniformity according to the center illumination C of the LED unit U that forms by any LED (its with beeline be placed) each other.
In the back light unit that is provided with a plurality of led modules (wherein, each all has a plurality of LED), uniformity, color reproducibility and the brightness that can strengthen back light unit by shape and the arrangement of adjusting LED.
Hereinafter, with reference to Fig. 9 and Figure 10 back light unit according to the present invention is made a more detailed description.
Fig. 9 is the plane according to back light unit of the present invention.
Figure 10 is the circuit diagram according to back light unit of the present invention.
With reference to Fig. 9, back light unit 100 according to the present invention can be the back light unit that can be driven separately for each piece.For example, back light unit 100 can comprise four led modules 120.Each led module 120 includes terminal plate 115 and is installed in a plurality of led chips 110 on the terminal plate 115.Can arrange led chip 110 according to the matrix of forming by 4 row and 9 row.
Led module 120 can be divided into six piece B1 to B6.In this embodiment, each piece B1 to B6 of formation led module 120 all means a unit that can be driven separately.
Led chip 110 in each piece of B1 to B6 can be connected in series each other.Thereby at least one end of each piece among the piece B1 to B6 is connected to independent connector can comes independent driving LED chip 110 for each piece.In order to realize that this connects, the terminal plate 115 of led module 120 comprises two first connectors 130 and six second connector 140a, 140b and 140c.First connector 130 and the second connector 140a, 140b and 140c are used for external voltage is provided to led chip 110.
The optical sheet (not shown) is attached on each led module 120 individually.Therefore, when a led module in a plurality of led modules 120 120 damages, thereby the optical sheet that can only remove on the led module 120 that is attached to damage substitutes or repairs the led module 120 of this damage, and this makes easily back light unit 100 to be done over again becomes possibility.
With reference to Figure 10, first B 1 each piece to the 3rd B3 is by six led chips 110 (it places three of first row and second row to list) composition, and each piece among six B6 of the 4th B4 to the is formed by six led chips 110 (it places three of the third line and fourth line to list).
The led chip of each piece is connected in series each other.In the serial circuit in three B3 of first B1 to the, for each piece, anodal (+) is connected to the first connector P1 publicly, and negative pole (-) is connected respectively to three second connector P21 to P23.Similarly, in the serial circuit in six B6 of the 4th B4 to the, for each piece, anodal (+) is connected to first connector publicly, and negative pole is connected respectively to three second connectors.The connector P1 of Figure 10 and P21 to P23 can be corresponding to first connector shown in Fig. 9 and second connectors.
Therefore, can realize separately driving required structure and can being that unit comes the number of led chip is regulated according to back light unit of the present invention with three led chips for each piece.
In back light unit according to the present invention, thereby it is luminous equably to arrange led chip according to the matrix shape of being made up of a plurality of row and columns, and can suitably regulate the required led chip number of certain area by regulating led module number, the piece number of each led module and the led chip number of each piece.Therefore, utilize appropriate density can easily arrange the led chip of necessary number.Therefore, might improve local dimming effect and whole color uniformity in medium size display and the large-sized monitor efficiently.
In addition, as mentioned above, the optical sheet (not shown) is attached on each led module 120 individually.Therefore, when a led module in a plurality of led modules 120 120 damages, thereby the led module 120 of this damage is replaced or repaired to the optical sheet that can only remove on the led module 120 that is attached to damage, and this makes easily back light unit 100 to be done over again becomes possibility.
In this embodiment, having described led module vertically is arranged according to it.Yet the arrangement of led module is not limited thereto.
Figure 11 shows the perspective view according to another example of the arrangement of the led module in the back light unit of the present invention.
As shown in figure 11, led module 120 can be arranged as around presumptive area.Among Figure 11, be example, yet the led module more than four can be arranged as around this zone with four led modules.When producing little heat, can be omitted in the cooling pad on the lower surface of led module.
According to the present invention, integrally form led module, place the optical sheet on the led module and place cooling pad below the led module, thereby reduced the size and the thickness of back light unit.
Because optical sheet is attached to each led module individually, thereby the led module of this damage is replaced or repaired to the optical sheet of only optionally removing the led module that is attached to the damage in a plurality of led modules, and this makes the subsequent treatment of handling such as doing over again become becomes possibility easily.
In addition, owing to consider the piece number that led module number, each led module are set in the color uniformity that depends on zone backlight and brightness and the LED number of each piece, therefore the number of optical sheet or reflector is minimized.
Therefore, might realize the size of back light unit and the product recovery rate of minimizing on the thickness and raising back light unit.
Although illustrated and described several embodiment of total inventive concept of the present invention, but those skilled in the art will recognize that, under the prerequisite of principle that does not deviate from total inventive concept and spirit, can make change to embodiment, the scope of total inventive concept is limited by additional claim and equivalent thereof.
Claims (5)
1. back light unit comprises:
A plurality of led modules have a plurality of LED of emission white light and the printed circuit board (PCB) (PCB) of support and the described a plurality of LED of driving;
Wherein said a plurality of LED comprises:
Led chip, the dominant wavelength that has are 420nm-456nm;
Red fluorescence powder excites red-emitting thereby place around the described led chip and by described led chip;
Green emitting phosphor excites transmitting green light thereby place around the described LED and by described led chip;
Wherein, described a plurality of led module is four or above and be arranged as around presumptive area at least on number.
2. back light unit according to claim 1, wherein, described red fluorescence powder comprises nitride based red fluorescence powder or sulfide base red fluorescent powder.
3. back light unit according to claim 1, wherein, described red fluorescence powder comprises nitride based CaAlSiN
3: Eu red fluorescence powder or sulfide base (Ca, Sr) S:Eu red fluorescence powder.
4. back light unit according to claim 1, wherein, described green emitting phosphor comprises any one in silicate-base green emitting phosphor, sulfide base green emitting phosphor and the nitride based green emitting phosphor.
5. back light unit according to claim 1, wherein, described green emitting phosphor comprises having A
2SiO
4Or A
3SiO
5Composition the silicate-base green emitting phosphor, have SrGa
2S
4: the sulfide base green emitting phosphor of the composition of Eu and have in the nitride based green emitting phosphor of composition of Beta-SiAlON any one, wherein A can be Sr, Ba, Ca and Mg, and Sr is an indispensable element, can optionally comprise Ba, Ca if necessary, reach Mg, and summation≤1 of being satisfied with the composition of 0≤Ba, Ca, Mg.
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| KR20070072266 | 2007-07-19 | ||
| KR10-2007-0072266 | 2007-07-19 | ||
| KR1020080069033A KR100951274B1 (en) | 2007-07-19 | 2008-07-16 | Back light unit |
| KR10-2008-0069033 | 2008-07-16 |
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| CN2008101299087A Division CN101349385B (en) | 2007-07-19 | 2008-07-21 | Backlight unit |
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| CN101701688A true CN101701688A (en) | 2010-05-05 |
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| CN2012100603565A Pending CN102635811A (en) | 2007-07-19 | 2008-07-21 | Back light unit |
| CN2008101299087A Active CN101349385B (en) | 2007-07-19 | 2008-07-21 | Backlight unit |
| CN200910126042A Pending CN101634405A (en) | 2007-07-19 | 2008-07-21 | Back light unit |
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| CN2012100603565A Pending CN102635811A (en) | 2007-07-19 | 2008-07-21 | Back light unit |
| CN2008101299087A Active CN101349385B (en) | 2007-07-19 | 2008-07-21 | Backlight unit |
| CN200910126042A Pending CN101634405A (en) | 2007-07-19 | 2008-07-21 | Back light unit |
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| JP (2) | JP4880005B2 (en) |
| KR (1) | KR100951274B1 (en) |
| CN (4) | CN101701688A (en) |
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- 2008-07-21 CN CN200910209695A patent/CN101701688A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2012089509A (en) | 2012-05-10 |
| KR20090009120A (en) | 2009-01-22 |
| CN102635811A (en) | 2012-08-15 |
| JP4880005B2 (en) | 2012-02-22 |
| CN101349385A (en) | 2009-01-21 |
| CN101349385B (en) | 2012-09-26 |
| JP2009105070A (en) | 2009-05-14 |
| CN101634405A (en) | 2010-01-27 |
| KR100951274B1 (en) | 2010-05-06 |
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