CN202652617U - LED backlight module circuit - Google Patents
LED backlight module circuit Download PDFInfo
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- CN202652617U CN202652617U CN 201220224571 CN201220224571U CN202652617U CN 202652617 U CN202652617 U CN 202652617U CN 201220224571 CN201220224571 CN 201220224571 CN 201220224571 U CN201220224571 U CN 201220224571U CN 202652617 U CN202652617 U CN 202652617U
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Abstract
The utility model relates to an LED backlight module circuit, which comprises at least one LED lamp strip and at least one constant current equalizer. Each LED lamp strip constitutes at least one branch, each branch is electrically connected with one constant current equalizer, and each branch is composed of m (row)*n (column) LED lamps, wherein n LED lamps in each row are connected in series, m LED lamps in each column are connected in parallel, and m and n are natural numbers. According to the LED backlight module circuit of the utility model, each branch of each LED lamp strip is composed of m (row)*n (column) LED lamps, n LED lamps in each row are connected in series and m LED lamps in each column are connected in parallel, and each branch is electrically connected with one constant current equalizer so that constant current of each branch and each LED lamp strip can be ensured. The LED backlight module circuit is installed at the side or in back of a liquid crystal display laterally or downwards so that current uniformity and luminous consistency of the LED lamps are ensured and the uniformity of backlight brightness is improved. Besides, backlight dark spots caused by early failure of individual LED is avoided, and the overall reliability and durability of LED backlight are improved.
Description
Technical field
The utility model relates to backlight circuit, particularly relates to a kind of LED-backlit modular circuit.
Background technology
Backlight module provides the assembly of the backlight of LED LCDs.The light source of backlight module produces principle and divides area source and line source.For LCDs, need to be given and illumination light-emitting by positive back by uniform area source.Single white light WLED can regard point-source of light as, can regard many single arrangements of white light WLED as line source.If line source is assembled the side of backlight module, adopting wedge shape or plate light guide plate to add reflector plate can become more uniform area source through superrefraction, reflection with line source, and this kind mode is side backlight; If single WLED evenly is arranged in the positive back of LCDs according to certain spacing, can obtain required area source adding light guide plate or diffusion sheet, this kind mode is direct-type backlight.
Traditional backlight no matter be side type or straight-down negative, majority all is to adopt multi-string LED through whole parallel operation, then adopt flow restricter to carry out current limliting, the LED self character is consistent yet the uniformity of electric current places one's entire reliance upon, so the intrinsic brightness uniformity is difficult to guarantee.And in actual use, it is backlight that the LED series connection consists of the work of many strings, and owing to reasons such as LED early failure, assembling defective or transient impacts, the LED occasional has inefficacy.Lost efficacy in case certain LEDs occurs, the LED series circuit connects, and the situation that certain a string LED does not work will inevitably occur.After indivedual LED lost efficacy open circuit, cause that local rectangular shadow appears in the overall lamp string LED rear liquid crystal display screen image that do not work, backlight uniformity is destroyed, thereby whole picture is impacted.
The utility model content
Based on this, be necessary to provide a kind of and can improve the inhomogeneity LED-backlit modular circuit of backlight illumination.
A kind of LED-backlit modular circuit, it is characterized in that, comprise: at least one LED lamp bar and at least one constant current current equalizer, described every LED lamp bar consists of at least one branch road, and every branch road links to each other with a constant current current equalizer electricity, and the LED lamp of described every the capable parallel connection of route m * n row series connection consists of, every row n LED lamp series connection, m LED lamp of every row is in parallel, and m, n are natural number.
Among embodiment, described every LED lamp bar consists of two branch roads therein, and every branch road links to each other with a constant current current equalizer electricity.
Among embodiment, described m is that 4, n is 7 therein, described every route 4 row parallel connection * 7 row series LED lamps formation, and the constant current of described constant current current equalizer is four times of LED rated current.
Among embodiment, described at least one constant current current equalizer is for accepting the Multichannel constant-current current equalizer of every branch current therein, and each passage of described constant current current equalizer is electrically connected a branch road.
Therein among embodiment, the backward diode of a protection of described every branch circuit parallel connection static, the positive pole of described backward diode links to each other with the low potential point of described branch road, and the negative pole of described backward diode links to each other with the high voltage of described branch road.
Among embodiment, described m is that 8, n is 7 therein, described every route 8 row parallel connection * 7 row series LED lamps formation, and the constant current of described constant current current equalizer is the LED rated current of octuple.
Among embodiment, also comprise the power supply of connecting and powering with at least one LED lamp bar therein, the output voltage of described power supply is 12 volts or 24 volts.
Among embodiment, the output voltage that described power supply provides is 24 volts therein.
Among embodiment, described at least one LED lamp bar is the product word arrangement or alignment is arranged therein.
Among embodiment, described LED lamp is white LED lamp therein.
Above-mentioned LED-backlit modular circuit, adopt the capable parallel connection of m * n to be listed as series connection by every branch road to every LED lamp bar, and every branch road is electrically connected with the constant current current equalizer, guarantee the current constant of every branch road, the current constant of every LED lamp bar, adopt side type or straight-down negative to be installed in the positive back of LCDs it, guaranteed LED lamp current uniformity and luminous consistency, improved the uniformity of backlight illumination.
Description of drawings
Fig. 1 is the structure chart of LED-backlit modular circuit among the embodiment;
Fig. 2 is the structure chart of LED-backlit modular circuit among another embodiment;
Fig. 3 is the structure chart of LED-backlit modular circuit among another embodiment;
Fig. 4 is the schematic diagram of arranging of LED-backlit modular circuit among the embodiment;
Fig. 5 is the schematic diagram of arranging of LED-backlit modular circuit among another embodiment.
Embodiment
Be described in detail below in conjunction with specific embodiment and the accompanying drawing concrete structure to the LED-backlit modular circuit, so that it is clearer.
As shown in Figure 1, in one embodiment, a kind of LED-backlit modular circuit comprises: at least one LED lamp bar and at least one constant current current equalizer.Every LED lamp bar consists of at least one branch road, and every branch road is connected with a constant current current equalizer, and the LED lamp of every the capable parallel connection of route m * n row series connection consists of, every row n LED lamp series connection, and m LED lamp of every row is in parallel, and m, n are natural number.
Concrete, LED lamp bar is the N root, every LED lamp bar consists of at least one branch road, every branch road is electrically connected with the constant current current equalizer, constant current current equalizer number is corresponding with a way, the constant current current equalizer can adopt multichannel constant current current equalizer, and every branch road of every lamp bar is electrically connected to a passage, so can adopt less constant current current equalizer.When LED lamp bar is the N root, every LED lamp bar consists of a branch road, and then the constant current current equalizer is N.When two branch roads of every LED lamp bar formation, every branch road links to each other with a constant current current equalizer electricity, and the constant current current equalizer is 2N.The capable parallel connection of m * n row series connection expression has m * n LED lamp, and " * " expression is multiplied each other.
The LED lamp of every the capable n row in parallel of route m series connection consists of, and among Fig. 1, D11 ~ Dmn is the LED lamp.(such as D11 ~ D1n) series connection, (D11 ~ Dm1) parallel connection, the m of every row LED lamp so interweaves the n of every row LED lamp arrangement alternately.
The constant current current equalizer adopts with benchmark current-sharing sampling, and is identical with the electric current that guarantees each constant current current equalizer.
In the present embodiment, can adopt output voltage is 12V(volt) or the power supply of 24V every LED lamp bar is powered.The number of n and the pressure drop of LED lamp are with relevant, and wherein, the series connection of the forward voltage of n times of LED lamp equals supply power voltage.
The LED lamp is white light WLED lamp.Consider that present white WLED production technology is progressively ripe and universal, and the cost descent coefficient is larger, so adopt white light WLED lamp.White light WLED is added by blue LED to be coated with the white light that the yellow fluorescent powder colour mixture becomes on the package.
Above-mentioned LED-backlit modular circuit, adopt the capable parallel connection of m * n to be listed as series connection by every branch road to every LED lamp bar, and every branch road is electrically connected with the constant current current equalizer, guarantee the current constant of every branch road, the current constant of every LED lamp bar, adopt side type or straight-down negative to be installed in the positive back of LCDs it, guaranteed LED lamp current uniformity and luminous consistency, improved the uniformity of backlight illumination.
Even and in each row in m LED lamp in parallel certain LED lamp open circuit that lost efficacy cause and do not work that the increase of other LED lamp current can evenly remedy this regional brightness, thereby can greatly improve the LED-backlit brightness uniformity in the LED lamp of this m parallel connection; Even certain LED lamp inefficacy short circuit in the LED lamp of m parallel connection in each row, cause that this m LED lamp in parallel all do not work, but because of the cross arrangement of " product " font branch road, other LED lantern festivals are done compensation to its brightness, impact drops to minimumly on the backlight illumination of whole LED-backlit module, has improved reliability and the durability of LED-backlit.
In the LED-backlit modular circuit as shown in Figure 2, adopt 7 LED lamp bars, every LED lamp bar consists of two branch roads, and m is that 4, n is 7, and every route 4 row parallel connection * 7 row series LED lamps consist of, and the constant current of constant current current equalizer is four times LED rated current.In present embodiment, the LED rated current is 20 milliamperes, and the constant current of constant current current equalizer is 80 milliamperes, and the output voltage of power supply adopts 24V.In conjunction with forward voltage, movement and the power supply General Output Voltage of white light WLED lamp, adopt that single-string LED lamp number is 7 in the every LED lamp bar, and the unified power supply of employing standard is 24V, so identical with Core of TV set 24V supply power voltage, make things convenient for the exploitation of power supply.And the unified design of adopting 24V can simplify drive plate of all lamp bars reduces voltage changing module, reduces cost.
Concrete, adopting the mode that the parallel connection of 4 row * 7 row are connected, the electric current of each branch road is 80 milliamperes, the electric current that each LED lamp is flow through in assurance is 20 milliamperes, and the forward voltage difference between each branch road is less than 0.7V.And the LED of 4 row parallel connections is based on supplier the forward voltage drop difference of LED is controlled prerequisite in the segmentation of 0.05V, designs according to demand parameter.The LED of 4 parallel connections can be one group.4 row parallel connection * 77 of row series connection expressions and joint group are connected.
Because white light WLED is added by blue LED to be coated with the white light that the yellow fluorescent powder colour mixture becomes on the package.And blue led is because the P/N structural relation is relatively more responsive to static, at the whole backward diode in parallel of every LED lamp bar, produce static in LED lamp bar transit rub, staff's hand takes the static of LED lamp bar all to consist of the bi-directional electrostatic protection, forward is WLED lamp bar itself, be reversed backward diode in parallel and consist of electrostatic leakage, effectively pre-antistatic causes reverse electrostatic breakdown damage to WLED, has improved the reliability of LED lamp bar.
When adopting the mode of 4 row parallel connection * 7 row series connection, every LED lamp bar consists of two branch roads, the backward diode of a protection of every branch circuit parallel connection static, the positive pole of backward diode links to each other with the low potential point of every branch road, and the negative pole of backward diode links to each other with the high voltage of every branch road.Backward diode can be IN4148 etc.
Further, 7 LED lamp bars, every LED lamp bar consists of two branch roads, and every branch road is electrically connected a constant current current equalizer, needs 14 constant current current equalizers.In order to save device, at least one constant current current equalizer is for accepting the Multichannel constant-current current equalizer of every branch current, can adopt 4 passage maximums to bear electric current such as the constant current current equalizer is 150 milliamperes constant current current equalizer, each passage of constant current current equalizer is electrically connected a branch road, 80 milliamperes of constant electric currents is provided for this branch road.Can adopt 44 passage maximums to bear electric current is 150 milliamperes constant current current equalizer.In addition, can adopt discrete device triode etc. to be connected into the constant current current equalizer.
In the LED-backlit modular circuit as shown in Figure 3, adopt 7 LED lamp bars, every LED lamp bar consists of a branch road, and m is that 8, n is 7, and every route 8 row 7 row series LED lamps in parallel consist of, and the constant current of constant current current equalizer is 160 milliamperes.Every LED lamp bar two backward diodes in parallel cause reverse electrostatic breakdown damage to prevent static to LED lamp bar.Adopt this circuit structure, because indivedual LED open circuits or short circuit cause electric current to be shared in residue LED lamp, the ability risk that this circuit structure is shared this abnormal current is lower, has more improved the reliability of LED lamp.
As shown in Figure 4, in the LED-backlit modular circuit, many LED lamp bars 10 are the product word arrangement.As shown in Figure 5, in the LED-backlit modular circuit, many LED lamp bar 10 alignment are arranged.Adopt product word arrangement or alignment to arrange, more can remedy the brightness uniformity impact of losing efficacy and bringing because of indivedual LED.
The LED-backlit modular circuit can adopt low pressure directly to power and reduce LED driving complexity, improves the power supply circuits versatility, and has avoided occuring because indivedual LED early failures cause dim spot backlight, improves global reliability and the durability of LED-backlit.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. LED-backlit modular circuit, it is characterized in that, comprise: at least one LED lamp bar and at least one constant current current equalizer, described every LED lamp bar consists of at least one branch road, and every branch road links to each other with a constant current current equalizer electricity, and the LED lamp of described every the capable parallel connection of route m * n row series connection consists of, every row n LED lamp series connection, m LED lamp of every row is in parallel, and m, n are natural number.
2. LED-backlit modular circuit according to claim 1 is characterized in that, described every LED lamp bar consists of two branch roads, and every branch road links to each other with a constant current current equalizer electricity.
3. LED-backlit modular circuit according to claim 2 is characterized in that, described m is that 4, n is 7, and described every route 4 row parallel connection * 7 row series LED lamps consist of, and the constant current of described constant current current equalizer is made as four times LED rated current.
4. LED-backlit modular circuit according to claim 3 is characterized in that, described at least one constant current current equalizer is for accepting the Multichannel constant-current current equalizer of every branch current, and each passage of described constant current current equalizer is electrically connected a branch road.
5. LED-backlit modular circuit according to claim 2, it is characterized in that, the backward diode of a protection of described every branch circuit parallel connection static, the positive pole of described backward diode links to each other with the low potential point of described branch road, and the negative pole of described backward diode links to each other with the high voltage of described branch road.
6. LED-backlit modular circuit according to claim 1 is characterized in that, described m is that 8, n is 7, and described every route 8 row parallel connection * 7 row series LED lamps consist of, and the constant current of described constant current current equalizer is the LED rated current of octuple.
7. LED-backlit modular circuit according to claim 1 is characterized in that, also comprises the power supply of connecting and powering with at least one LED lamp bar, and the output voltage of described power supply is 12 volts or 24 volts.
8. LED-backlit modular circuit according to claim 7 is characterized in that, the output voltage that described power supply provides is 24 volts.
9. each described LED-backlit modular circuit in 8 according to claim 1 is characterized in that described at least one LED lamp bar is the product word arrangement or alignment is arranged.
10. each described LED-backlit modular circuit in 8 according to claim 1 is characterized in that described LED lamp is white LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220224571 CN202652617U (en) | 2012-05-17 | 2012-05-17 | LED backlight module circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220224571 CN202652617U (en) | 2012-05-17 | 2012-05-17 | LED backlight module circuit |
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| CN202652617U true CN202652617U (en) | 2013-01-02 |
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| CN 201220224571 Expired - Fee Related CN202652617U (en) | 2012-05-17 | 2012-05-17 | LED backlight module circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014117294A1 (en) * | 2013-01-31 | 2014-08-07 | 视网科技股份有限公司 | Parallel light-emitting diode lamp having constant current device |
| CN105375612A (en) * | 2015-12-08 | 2016-03-02 | 常州诚联电源制造有限公司 | Power supply module of display screen and use method for power supply module |
| CN107068006A (en) * | 2017-03-22 | 2017-08-18 | 四川蓝景光电技术有限责任公司 | LED light box and display device |
| WO2020192618A1 (en) * | 2019-03-27 | 2020-10-01 | 深圳Tcl新技术有限公司 | Backlight source, backlight module and display apparatus comprising same |
| CN112002287A (en) * | 2020-08-31 | 2020-11-27 | 上海创功通讯技术有限公司 | Brightness compensation method of backlight circuit and electronic equipment storage medium |
-
2012
- 2012-05-17 CN CN 201220224571 patent/CN202652617U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014117294A1 (en) * | 2013-01-31 | 2014-08-07 | 视网科技股份有限公司 | Parallel light-emitting diode lamp having constant current device |
| CN105375612A (en) * | 2015-12-08 | 2016-03-02 | 常州诚联电源制造有限公司 | Power supply module of display screen and use method for power supply module |
| CN107068006A (en) * | 2017-03-22 | 2017-08-18 | 四川蓝景光电技术有限责任公司 | LED light box and display device |
| WO2020192618A1 (en) * | 2019-03-27 | 2020-10-01 | 深圳Tcl新技术有限公司 | Backlight source, backlight module and display apparatus comprising same |
| CN112002287A (en) * | 2020-08-31 | 2020-11-27 | 上海创功通讯技术有限公司 | Brightness compensation method of backlight circuit and electronic equipment storage medium |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130102 Termination date: 20180517 |
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| CF01 | Termination of patent right due to non-payment of annual fee |