CN106444158A - Large-size liquid crystal screen LED matrix direct type highlight backlight module - Google Patents
Large-size liquid crystal screen LED matrix direct type highlight backlight module Download PDFInfo
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- CN106444158A CN106444158A CN201611114949.XA CN201611114949A CN106444158A CN 106444158 A CN106444158 A CN 106444158A CN 201611114949 A CN201611114949 A CN 201611114949A CN 106444158 A CN106444158 A CN 106444158A
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- light source
- led light
- led matrix
- backlight module
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133612—Electrical details
Abstract
The invention discloses a large-size liquid crystal screen LED matrix direct type highlight backlight module which comprises a fog plate, a PCB and an LED matrix module arranged on the circuit board. The LED matrix module comprises a plurality of LED light source columns connected in parallel, each LED light source column comprises 12-24 LED light sources, the size of the PCB is matched with the number of the LED light sources in each column on the LED matrix module and the total number of the LED light source columns, thee LED light sources are single-core packaged whole-white highlight borderlight LED lamp beads with SMD welded to the surfaces, and the packaging size range is 4,014, namely, 4.0 mm x1.4 mm. According to the color coordinate value of the LED light sources, X is about 0.303, and Y is about 0.293. The brightness value of the LED light sources is 7,000 mcd or above, grading screening is carried out according to the standard of 0.1 V, forward current standard-level current of 60 mA is adopted as the rated current of the LED light sources, and the distance between the lamp beads is 11.6 mm and can be adjusted by +/-10%. The large-size liquid crystal screen LED matrix direct type highlight backlight module has the advantages of high brightness, high efficiency, the small heating amount, good heat radiation performance, stable performance and the like which are unavailable to an existing product.
Description
Technical field
The present invention relates to a kind of technical scheme of LED application, under particularly a kind of Large-size LCD Screen LED matrix is straight
Formula highlighting backlight module.
Background technology
At present, the backlight of liquid crystal display screen has taken leave of the CCFL epoch, the LCD-TV liquid of 26 cun to 84 cun of large scale on market
Brilliant screen substantially does side-light backlight with LED in order to screen is made as far as possible thin, supporting backlight, and brightness only has 300-400
Lumen, is only suitable for indoor environment work it is impossible to apply under strong light environment out of doors.As I was in the patent of invention of 2009
" being applied to large-scale LCD ultra-high brightness LED matrix straight-downward backlight module ", the patent No.：ZL200910105907.3, just carries
The brightness of high LCD screen provides solution to 1000-1500 lumen.Limited by LED encapsulation technology at that time, the program is also deposited
Higher in power consumption, the low problem of photoelectric transformation efficiency.
The backlight module of large-scale LCD screen mainly has 2 classes, is side-light type and straight-down negative respectively（Bottom season formula）.Disappearing at present
On expense class market, the LCD-TV widescreen of main flow is all to do side light source with LED, and side-light backlight is by LED lamp bar（It is placed on liquid crystal display screen
Side）, light guide plate（Transparent acrylic is printed on reflective spot）, optics reflective membrane and bright enhancement film, plastic frame and metal frame composition,
Brightness range is all in 300-400 lumen.And downward back is just placed on the behind of liquid crystal display screen, mist plate by LED matrix light source board（Half
Transparent acrylic）, optics reflective membrane and bright enhancement film, plastic frame and metal frame composition.Do light source with LED existing several years, at present
It is applied to small size LCD screen, such as mobile phone, PDA, panel computer, hand-held camera screen is all LED side formula backlight, notebook computer
LCD display on screen and desktop also be LED side formula backlight LCD screen, brightness range is all left in 200-300 lumen
The right side, the display effect under outdoors sunlight is not good.
More than 26 cun, or even big to 55---84 cun of LCD-TV widescreen is pursued due to production firm and is made the thickness of screen
As far as possible thin, also it is all using LED side formula backlight, brightness may only reach 300-400 lumen, the brightness of indivedual screens can reach 700
Lumen.On the market of highlighted LCD screen, manufacturer is all to make super bright direct-type backlight with LED matrix, as special in me
Profit：Technical scheme disclosed in ZL200910105907.3, makes highlighted LCD liquid crystal display screen and supplies outdoor application.Domestic at present only have
Several companies have the ability to produce this kind of product, but most scheme all to there is photoelectric transformation efficiency low, do not reach current client
Requirements at the higher level to brightness, LED-backlit power consumption is higher, and the heat of generation is high, and the problems of excessive heat of screen is serious, and the low impact of reliability makes
Use the life-span.
At present on LCD-TV large-size screen monitors more than 26 cun to 55 cun, and 55 cun, domestic each manufacturer releases the highlighted of market
Liquid crystal screen products are essentially all LED direct-type backlight, and brightness is all 1500 lumens, and brightness does not reach outdoor strong light environment can
Depending on display require；And high power consumption and hyperpyrexia, the application of outdoor hot environment has very big problem, and especially outdoors sunlight directly shines
Penetrate down, situation is worse, screen quickly can be because the high temperature blackening of backlight high temperature and the generation of sunlight heat-absorption dual reason be it is impossible to normally show
Show.
In granted patent：In technical scheme disclosed in ZL200910105907.3, by the encapsulation technology institute of LED at that time
Limit, in the highlighting backlight scheme being applied to more than 32 cun LCD large size panels, uses three core LED lamp bead, and brightness is high but seals
Dress size is larger, and the arrangement pitches therefore between lamp and lamp are larger, and lamp is also larger with the distance of the spatial altitude of mist plate, causes light
Photoelectric transformation efficiency is low, and high power consumption produces hyperpyrexia, and out of doors under sunlight direct irradiation in hot environment, screen quickly can be high because of backlight
Blank screen phenomenon the high temperature that the gentle dual reason of sunlight heat-absorption produces occurs it is impossible to normal show.
The technical problem to be solved is exactly to make visual direct-type backlight under super brightness sunlight with LED matrix
Module, the brightness of LCD module is improved more than 5 times, reaches more than 2000 lumens, and even more high to 3500-5000 lumen meets
Lower power consumption is reduced the heat that backlight produces by visual brightness requirement under outdoors sunlight simultaneously, for outdoor multimedia, by force
The application of luminous environment LCD display provides reliability higher, visual LCD display module under the lower super brightness sunlight of energy consumption.
In view of this, it is an object of the invention to provide a kind of new technical scheme is to solve existing technological deficiency.
Content of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of highlighted back of the body of Large-size LCD Screen LED matrix straight-down negative
Light module, the brightness solving prior art presence is low, does not meet outdoor application requirement, high energy consumption, caloric value height, poor reliability
Etc. technological deficiency.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module, including mist plate, PCB be arranged on described
The LED matrix module of circuit board, described LED matrix module includes the LED light source row that multiple row is connected in parallel with each other, each LED light
Source row include 12-24 LEDs light source, and the size of described PCB mates the LED light source quantity of each column in LED matrix module
With total columns of LED light source row, described LED light source is that surface soldered SMD single encapsulates whole white highlighted top light LED lamp bead, its
Package dimension is 4014, i.e. 4.0x1.4mm, and LED light source color coordinate values are X：0.303；Y：Near 0.293, LED light source brightness
Value, in 7000 more than mcd, is screened with 0.1 V stepping, and it is 60mA forward current standard level electric current that LED light source adopts rated current.
As the improvement of technique scheme, 12-24 LEDs light source is connected into row by described LED matrix modular circuit, number
Ten row described LED light source row are connected in parallel, and described LED matrix modular circuit adopts boost type DC-DC constant-current driving.
As the improvement further of technique scheme, the distance between described PCB and mist plate are 12.5-
15mm.
As the improvement further of technique scheme, the horizontal spacing of the LED light source in described LED matrix module is
10-12.8mm, the longitudinal pitch of the LED light source in described LED matrix module is 10-12.8mm.
As the improvement further of technique scheme, the LED light source in LED matrix module the distance between in length and breadth with
11.6mm is distance values, can do positive and negative 10% adjustment.
As the improvement further of technique scheme, described PCB is the single-sided aluminum-base plate of thickness 1.0-1.6mm
Circuit board.
As the improvement further of technique scheme, the one side setting that described PCB is provided with LED light source is coated with
Pure white reflectorized paint, the one side that PCB is coated with reflectorized paint is provided with reflective membrane, and described reflective membrane offers
The through hole passing through for LED light source.
As the improvement further of technique scheme, described PCB back is provided with E type aluminium section bar heat sink,
Thermal grease close adhesion is adopted between described E type aluminium section bar heat sink and PCB.
As the improvement further of technique scheme, above described E type aluminium section bar heat sink, it is provided with some radiation airs
Fan.
As the improvement further of technique scheme, described supply voltage is constant voltage, and described supply current is perseverance
Determine electric current, supply voltage and supply current can Synchronization Control.
The invention has the beneficial effects as follows：The invention provides a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight
Module, the invention provides highlighting backlight module is the highlighted down straight aphototropism mode set of LED matrix, its brightness can reach 2000 lumens
More than, even up to 3500-5000 lumen, meet visual application under outdoors sunlight, applied range；This kind of backlight module work(
Consumption only has 65% even lower, low-power consumption no problems of excessive heat of existing LED straight-down negative highlighting backlight；Described LED light source is Surface Mount weldering
It is connected on aluminium base circuit board, cooperation E type heat-dissipation aluminum sectional material heat sink directly radiates, and thermal diffusivity is fine；Power supply used is
Boost type DC-DC direct current driving power supply, has more than 92% high conversion efficiency, reliability height；Modularized limit emitting diode (LED) matrix wooden unit and
The supporting Power Management Design of modularity, is conveniently extended to the LCD large-size screen monitors of any size, need not be the highlighted LCD screen of oversize
The exploitation of driving power supply, design and production making time and fund again, good economy performance, the cost-effective and time.
The brightness that this kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module solves prior art presence is low,
Do not meet the technological deficiencies such as outdoor application requirement, high energy consumption, caloric value height, poor reliability.
Brief description
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is assembling schematic diagram of the present invention；
Fig. 2 is present configuration broken away view；
Fig. 3 is the structural representation of another angle of the present invention
Fig. 4 is the current diagram of LED light source in the present invention；
Fig. 5 is the structural representation of first embodiment of the invention；
Fig. 6 is the structural representation of second embodiment of the invention；
Fig. 7 is the cross-sectional view of the present invention.
Specific embodiment
Technique effect below with reference to the design, concrete structure and generation to the present invention of embodiment and accompanying drawing is carried out clearly
Chu, it is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this
Bright a part of embodiment, rather than whole embodiments, based on embodiments of the invention, those skilled in the art is not paying
The other embodiment being obtained on the premise of creative work, belongs to the scope of protection of the invention.In addition, being related in patent
All connection/annexations, not singly refer to component and directly connect, and refer to can according to the situation that is embodied as, by adding or
Reduce connection auxiliary, to form more excellent draw bail.Each technical characteristic in the invention, in not conflicting conflict
On the premise of can be with combination of interactions, reference picture 1-7.
In patent：Scheme described in ZL 200910105907.3, the encapsulation technology by LED at that time is limited, and is being applied to 32
In the highlighting backlight scheme of very little above LCD large size panel, use three core LED lamp bead, brightness is high but package dimension is larger, because
Arrangement pitches between this lamp and lamp are larger, and lamp bead is also larger with the distance of the spatial altitude of mist plate, causes photoelectric transformation efficiency
Low, high power consumption produces hyperpyrexia, and out of doors under sunlight direct irradiation in hot environment, screen can be inhaled because of backlight high temperature and sunlight quickly
Blank screen phenomenon the high temperature that the dual reason of heat produces occurs it is impossible to normal show.
The purpose of the present invention is that the Novel LED lamp bulb after application LED encapsulation technology is improved makes LED matrix straight-down negative superelevation
Brightness backlights module, brightness is enhanced about more than once on the basis of patent ZL200910105907.3, can bring up to 2000 streams
Bright, even more high reaches 3500-5000 lumen, both can meet under outdoors sunlight beautiful visual more high brightness require, and can solve
The certainly excessive problems of excessive heat with generation of power consumption；Overall backlight module is that boost type DC-DC DC source is powered, and improves Power convert
Efficiency, and improve the reliability and stability of whole machine, modularity backlight design, convenient splicing and extension, can easily should pole
Use on the LCD large-size screen monitors of any size, the modularity extension being also convenient for backlight electric power is supporting, need not be bigger LCD screen system
Make more powerful backlight electric power；The brightness controlled range of LED matrix is big, brightness can drop to the 5-15% of maximum brightness, for carrying
High dynamic contrast provides feasibility, substantially improves the display effect of night dark surrounds, and energy-conserving and environment-protective.
The topmost main points of the present invention are how in LED product numerous in the market from optimal a
LED, its relatively large cost of production capacity commercially is again low, have larger price advantage, designs what circuit and matrix pattern
And the luminous efficacy of this LED can be played to greatest extent, it is uniform that the maximum brightness reaching the present invention requires, brightness is controlled and good
How LED heat is directed to outside backlight module and radiating mode by degree index.
Main technical schemes of the present invention are：
A kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module, including mist plate 1, PCB 2 be arranged on institute
State the LED matrix module 3 of circuit board 2, described LED matrix module 3 includes the LED light source row that multiple row is connected in parallel with each other, each
LED light source row include 12-24 LEDs light source 31, and the size of described PCB 2 mates the LED of each column in LED matrix module
Light source 31 quantity and total columns of LED light source row, described LED light source 31 is that surface soldered SMD single encapsulates the highlighted top of whole white
Light LED lamp bead, its package dimension is 4014, i.e. 4.0x1.4mm, and LED light source 31 color coordinate values are X：0.303；Y：0.293 is attached
Closely, LED light source 31 brightness value, in 7000 more than mcd, is screened with 0.1 V stepping, and it is 60mA that LED light source 31 adopts rated current
Forward current standard level electric current.
First in technical solution of the present invention, selected LED light source 3 is the LED lamp bead of single small-sized package, classic form
Number it is 4014, its a size of 4.0x1.4mm, LED light source 31 is that surface soldered SMD single encapsulates whole white highlighted top light LED, color
Color coordinate figure is X：0.303；Y：Near 0.293, close with day light color, LED light source 31 brightness value in 7000 more than mcd,
60mA forward current standard level（Small-power level）It is desirable to 0.1 V stepping screening it is ensured that in low-voltage small current working condition
Good concordance.In order to reach good brightness and uniformity index, LED light source 31 quantity used by LED matrix module 3 is relatively
Many, it is high-density array；From this 60mA standard level LED, it is to reduce in order to general power is tried one's best, reaches low-power consumption, reduce
The problems of excessive heat that backlight produces.Although the higher great power LED of brightness is had on market, level as high-power in 120mA forward current and
Ceramic package high power level, but single-point brightness too high point Luminous Efficiency of a Source is too strong, is difficult on the contrary reach the good uniformity, and such as selects
With high-power LED, general power will necessarily increase too much, causes power consumption excessive and problems of excessive heat.The LED-backlit of the present invention is mould
Massing mode, the controllable quantity system of each LED light source 31 used by LED matrix module 3 at 600-900, in this quantity
Accomplish that each LED light source used by LED matrix module 3 is feasible using 0.1V stepping, that is, LED be 3.0-3.1V,
3.1-3.2V, 3.2-3.3V, 3.3-3.4V stepping, is separately employed on single led matrix module 3, and between each backlight module
Voltage difference can be made adjustment by its power supply, reach the consistent of module group.
Further, described PCB 2 is 1.0-1.6mm single-sided aluminum-base plate circuit board for thickness, and PCB 2 is carried on the back
Portion is provided with the thick E type aluminium section bar heat sink 4 of 10-15mm, and the one side that PCB 2 is provided with LED light source 2 coats pure white
Reflectorized paint, increases reflecting effect, sees Fig. 1；This one side that described PCB 2 is provided with LED light source 31 is again plus a piece of reflective
Film, reflective membrane has openning hole in advance by the size dimension and position of LED light source 31 in advance, is then attached in PCB 2 again,
Increase reflecting effect further；Described E type aluminium section bar heat sink 4 can be spliced by multi-disc, the chi of E type aluminium section bar heat sink 4
Very little can see Fig. 2 as the base areas of overall backlight module；The PCB 2 welding LED light source 31 is tight with thermal grease
Close be bonded on E type aluminium section bar heat sink 4 and be screwed, make LED-backlit module base plate, using E type aluminium section bar radiating
The purpose of plate 4 is to directly guide the heat of LED, improving the heat dispersion of backlight module；In LED-backlit module E
The top of type aluminium section bar heat sink 4, can suitably install radiator fan additional, increase radiating effect, see Fig. 3.
Preferably, the circuit of described LED matrix module 3 is using the circuit gone here and there and combine, the back of the body of current LCD-TV screen
Photoelectric source great majority are to be powered using 24VDC direct-current working volts, and according to this standard, the circuit of the present invention is to use 12-24 grain
LED power 31 is connected in column, and tens of row compose in parallel the circuit of one piece of LED matrix module 3, and the size according to screen determines simultaneously
The quantity of joint group and the length of matrix module, are shown in circuit theory Fig. 4；The quantity of LED matrix module 3 and its permutation and combination method
It is that its quantity and permutation and combination method are determined according to the size of screen, full vertical cartel can arrange, such as 26 cun and 32 cun screens, see
Fig. 5；Or level arranges to subassembly, such as 42 cun to more than 84 cun of screen, see Fig. 6.
Preferably, the mode of LED matrix module 3 arrangement and quantity are to require and realize good equal to reach maximum brightness
Evenness is principle, LED matrix module 3 with 18 LED light source 31 series circuits as string, every LED light source 31 laterally and vertical
To spacing be 10-12.8mm, according to screen size make adjustment within this range, each column LED strip join circuit distance in the ranks
Be also 10-12.8mm, so each LED light source 31 in length and breadth between form square matrix, the length of described PCB 2 and row
Quantity extend to the both sides of LCD screen visible area according to such permutation and combination method, the size also according to screen is made
Adjustment, with meet LED matrix module 3 arrangement area consistent with LCD viewing area.
Preferably, the present invention LED matrix module 3 arrangement in most important data be each LED light source 31 in length and breadth between
Distance with 11.6mm as distance values, positive and negative 10% adjustment can be done, crossing secret meeting increases LED usage quantity, increases power consumption, spacing
Cross conference impact brightness and the uniformity, the overall display effect of impact.According to this LED light source 31 spacing by PCB 2 and mist plate
The distance between 1 furthers, and shortens to 14mm, at present in the direct-type backlight of most of large size panels, in order to reduce the number of lamp bead
Amount, generally adds astigmatism lampshade using large scale LED lamp bead, in order to meet the requirement of the uniformity, the distance between LED lamp panel and mist plate
Must be sufficiently large, major part is all 20-25mm；The technical solution used in the present invention is small size LED light source 31 high-density array,
The distance furthering with mist plate 1, the loss of LED light source 31 projection light is reduced to as far as possible little, LED light source used in the present invention 31
Angular is 120 degree, and effective light projection area of each LED light source 31 needs to overlap between each LED light source 31, to change
The kind uniformity, is shown in Fig. 7.
Highlighted LCD module bright LCD screen low from standard on market has the characteristics that its different and methods for using them, and standard is low bright
The brightness regulation of LCD screen is that the gain adjusting display image with OSD is realized, and is not the intrinsic brilliance adjusting backlight；Highlighted
LCD module can not use this regulative mode, because OSD gain-adjusted scope is too little it is necessary to the reality adjusting backlight is bright
Degree.For highlighted LCD module, on the one hand its brightness is high, is suitable for application in daytime and strong light environment, on the other hand,
In night and dark surrounds, brightness must be able to lower, otherwise just too dazzling.This is accomplished by very trickle, linear bright
Degree adjustable control circuit；And the control for overall power and temperature, the restriction of total current and control are just especially most important.Pin
To this requirement and characteristic, the highlighted down straight aphototropism mode set of LED matrix of the present invention has special strict wanting to power-supplying circuit
Ask, voltage and current will accomplish it is relative constancy, is constant-current source and constant pressure source, and synchronization double-control, voltage rises simultaneously
Electric current also rises, and electric current also drops simultaneously for voltage drop；Due to being boost type DC-DC drive circuit, by the most secretly to input voltage the brightest
The scope of adjustment, is between 41.4-57.6V, in maximum brightness state taking 18 LED light source 31 series circuits as a example
When, the voltage drop on every LED light source 31 is less than 3.05-3.2V, and each group of current maxima is 45mA, is equivalent to specified
The 75% of electric current, controls LED light source 31 temperature will not be overheated with this, can drop to close to 3-5mA, LED light source 31 in the darkest state
When maximum brightness works, its substrate is with less than 55oC is limited, and this is the most important data of the present invention, exceedes electric current maximum
Value, the luminous of LED light source 31 will not rise anti-fall because overheated.Due to using E type aluminium section bar heat sink 4, the heat of LED light source 31
Directly can derive through E type aluminium section bar heat sink 4, install fan again additional in E type aluminium section bar heat sink 4 and improve radiating effect.
It is more than that the preferable enforcement to the present invention is illustrated, but the invention is not limited to described enforcement
Example, those of ordinary skill in the art also can make a variety of equivalent variations without prejudice on the premise of present invention spirit or replace
Change, these equivalent deformation or replacement are all contained in the application claim limited range.
Claims (10)
1. a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module it is characterised in that：Including mist plate（1）, PCB electricity
Road plate（2）Be arranged on described circuit board（2）LED matrix module（3）, described LED matrix module（3）Including multiple row mutually simultaneously
The LED light source row that connection connects, each LED light source row include 12-24 LEDs light source（31）, described PCB（2）Size
The LED light source of each column in coupling LED matrix module（31）Quantity and total columns of LED light source row, described LED light source（31）For table
Face welding SMD single encapsulation whole white highlighted top light LED lamp bead, its package dimension is 4014, i.e. 4.0x1.4mm, LED light source
（31）Color coordinate values are X：0.303；Y：Near 0.293, LED light source（31）Brightness value, in 7000 more than mcd, is divided with 0.1 V
Shelves screening, LED light source（31）It is 60mA forward current standard level electric current using rated current.
2. a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module according to claim 1, its feature exists
In：Described LED matrix modular circuit is by 12-24 LEDs light source（31）In column, tens of row described LED light source row are in parallel even for series connection
Connect, described LED matrix modular circuit adopts boost type DC-DC constant-current driving.
3. a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module according to claim 1, its feature exists
In：Described PCB（2）With mist plate（1）The distance between be 12.5-15mm.
4. a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module according to claim 1, its feature exists
In：LED light source in described LED matrix module（31）Horizontal spacing be 10-12.8mm, the LED in described LED matrix module
Light source（31）Longitudinal pitch be 10-12.8mm.
5. a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module according to claim 1, its feature exists
In：LED light source in LED matrix module（31）The distance between in length and breadth with 11.6mm as distance values, positive and negative 10% tune can be done
Whole.
6. a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module according to claim 1, its feature exists
In：Described PCB（2）Single-sided aluminum-base plate circuit board for thickness 1.0-1.6mm.
7. a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module according to claim 1, its feature exists
In：Described PCB（2）It is provided with LED light source（31）One side setting be coated with pure white reflectorized paint, PCB（2）
On be coated with the one side of reflectorized paint and be provided with reflective membrane, described reflective membrane offers for LED light source（31）Pass through is logical
Hole.
8. a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module according to claim 1, its feature exists
In：Described PCB（2）Back is provided with E type aluminium section bar heat sink（4）, described E type aluminium section bar heat sink（4）With PCB electricity
Road plate（2）Between adopt thermal grease close adhesion.
9. a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module according to claim 8, its feature exists
In：Described E type aluminium section bar heat sink（4）Top is provided with some radiator fans.
10. a kind of Large-size LCD Screen LED matrix straight-down negative highlighting backlight module according to claim 1, its feature exists
In：Described supply voltage is constant voltage, and described supply current is constant current, and supply voltage and supply current can synchronously be controlled
System.
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