CN202197355U - Power supply and driving device used for LED backlight and liquid crystal television comprising the same - Google Patents
Power supply and driving device used for LED backlight and liquid crystal television comprising the same Download PDFInfo
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- CN202197355U CN202197355U CN2011201381676U CN201120138167U CN202197355U CN 202197355 U CN202197355 U CN 202197355U CN 2011201381676 U CN2011201381676 U CN 2011201381676U CN 201120138167 U CN201120138167 U CN 201120138167U CN 202197355 U CN202197355 U CN 202197355U
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- led
- power supply
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- backlit
- circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Liquid Crystal Display Device Control (AREA)
Abstract
In order to solve the technical problems of electric energy wasting, complicated wiring, easy interference, superfluous circuit modules, and low contrast existing in the design of a power supply drive board of an LED (Light-Emitting Diode) backlight, the utility model puts forward a power supply and driving device used for the LED backlight, wherein a power supply and an LED drive board used for the LED backlight are integrated on the power supply and driving device. In addition, the utility model also provides a liquid crystal television. By adopting the above technical scheme, the power supply and driving device of the utility model can realize the technical effects of saving energy, simplifying wiring, eliminating interference, reducing superfluous circuits as much as possible, and controlling the each LED to raise the contrast.
Description
Technical field
The utility model relates in general to household appliance technical field, more specifically, and the LCD TV that relates to a kind of LED of being used for (light-emitting diode) power supply and drive unit backlight and comprise this device.
Background technology
Along with constant development of economy, the improving constantly of people's material life, the competition of LCD TV is constantly fierce; Each producer all will reduce power consumption, reduce cost, and improve function; Increase the function of LCD TV; Or ultra-thin the grade do technical research and development and improve, and therefore, just arises at the historic moment at the power supply research and development technology of the LED of backlight drive IC (integrated circuit) chip.
At present in the middle of the prior art; Existing single supply+driving PCB (printed circuit board (PCB)) plate power technology; With LIPS power supply (two-in-one power supply) technology; Wherein all need carry out a driving voltage and electric current, guarantee the operate as normal of liquid crystal display screen backlight, but its driving power all can not accomplish to reduce the power consumption of backlight to LED.
Fig. 1 shows the schematic block diagram of the single supply+driving PCB plate of prior art.
As can beappreciated from fig. 1, power panel converts a DC (direct current) output through the AC power input into through power panel; For example be 24V; This 24V direct current inputs to the LED drive plate, and drive plate converts the needed operating voltage of LED lamp bar into through a DC/DC, such as being 60V.The shortcoming of this design is that transformation efficiency is lower, and connecting line is many, forms easily and disturbs and radiation.Simultaneously power driving circuit is unnecessary has gone out one by 24 to 60V DC/DC voltage conversion circuit.In addition, with respect to the circuit design that does not increase local dimming LED driving IC chip, this design power consumption is bigger, can not reach purpose of energy saving
That is to say that the technological corresponding energy conversion efficiency of power supply+driving PCB plate is lower, redundant DC/DC circuit part has increased cost, has reduced the conversion efficiency of power supply again.
The utility model content
More for the waste electric energy, the wiring that exist in the power drives plate design that solves above-mentioned LED-backlit, disturb, exist unnecessary circuit module, technical problem that contrast is low mutually easily; The utility model provides a kind of power supply and drive unit that is used for the LED-backlit unit, be integrated with power supply and the LED drive plate that is used for the LED-backlit unit integratedly on power supply and the drive unit.
Wherein, the power supply that is used for the LED-backlit unit comprises: rectification-power factor correction (PFC) circuit is electrically connected to outside 220V AC power; Transformer reverse exciting switching voltage regulator circuit is electrically connected to rectification-power factor correction pfc circuit; And rectification-filter circuit, be connected electrically between transformer reverse exciting switching voltage regulator circuit and the LED-backlit unit.
Wherein, the LED drive plate comprises: constant-current source circuit is electrically connected to the LED-backlit unit; And; The LED chip for driving is electrically connected to the LED-backlit unit.
Wherein, chip for driving comes each LED in the LED-backlit unit is controlled according to the reference clock CLK signal and the data DATA signal that are provided by system board.
In addition, a kind of LCD TV is provided also, has comprised: liquid crystal display screen is arranged on the user oriented side of LCD TV; The LED-backlit unit is arranged in the LCD TV, is used to liquid crystal display screen light source is provided; Power supply is used to the LCD TV power supply; The LED drive plate is connected electrically between power supply and the LED-backlit unit, is used for the driving LED back light unit; And system board, being electrically connected with power supply and LED drive plate, power supply and LED drive plate are integrated into power supply and drive unit integratedly.
Wherein, the LED drive plate comprises: constant-current source circuit is electrically connected to the LED-backlit unit; And the LED chip for driving, be electrically connected to the LED-backlit unit.
Wherein, power supply comprises: rectification-power factor correction pfc circuit is electrically connected to power supply; Transformer reverse exciting switching voltage regulator circuit is electrically connected to rectification-power factor correction pfc circuit; And rectification-filter circuit, be connected electrically between transformer reverse exciting switching voltage regulator circuit and the LED-backlit unit.
Wherein, chip for driving comes each LED in the LED-backlit unit is controlled according to the reference clock CLK signal and the data DATA signal that are provided by system board.
Through implementing above technical scheme, that the utility model can be realized is energy-conservation, wiring reduces, eliminate and disturb, reduce as far as possible unnecessary circuit mutually, can control to improve the technique effect of contrast each LED.
Further feature of the utility model and advantage will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through implementing the utility model.The purpose of the utility model can realize through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtain with other advantages.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the sketch map according to a kind of single supply+driving PCB plate of prior art;
Fig. 2 is according to the power supply that is used for the LED-backlit unit of the exemplary embodiment of the utility model and the schematic block diagram of drive unit 200 and relevant configuration thereof; And
Fig. 3 is 200 a detailed diagram according to the power supply that is used for the LED-backlit unit of the exemplary embodiment of the utility model and drive unit.
Embodiment
The basic principle of the utility model is; Through being carried out integrated the setting, the power supply of LED-backlit unit and drive plate realize that wiring reduces; Through designing new LED-backlit drive plate and replacing existing drive plate and realize improving the electric energy conversion efficiency that alternating current circuit becomes DC circuit; And reduced unnecessary circuit module; And through interpolation chip for driving (chip for driving is to LED chip for driving control, LED drive controlling LED lamp) is set and realizes each LED is controlled, thereby lower power consumption, improve contrast.
To combine accompanying drawing that the preferred embodiment of the utility model is described in detail below.
Fig. 2 is according to the power supply that is used for the LED-backlit unit of the exemplary embodiment of the utility model and the schematic block diagram of drive unit 200 and relevant configuration thereof.
As shown in Figure 2; The utility model provides a kind of power supply and drive unit 200 that is used for the LED-backlit unit; Be integrated with the power supply 208 and LED drive plate 202 that is used for the LED-backlit unit integratedly on power supply and the drive unit 200, this integrates plate and can be described as power supply-LED and drive integrated board.The integrated setting of this kind reduced wiring, and reduced the probability of disturbing mutually to a certain extent.
Further, Fig. 3 is 200 a detailed diagram according to the power supply that is used for the LED-backlit unit of the exemplary embodiment of the utility model and drive unit.
As shown in Figure 3, the power supply 302 that is used for the LED-backlit unit preferably includes: rectification-power factor correction pfc circuit is electrically connected to outside 220V AC power; Transformer reverse exciting switching voltage regulator circuit is electrically connected to rectification-power factor correction pfc circuit; And rectification-filter circuit, be connected electrically between transformer reverse exciting switching voltage regulator circuit and the LED-backlit unit.
Chip for driving is the function that the utility model provides local dimming, that is, through chip for driving each LED in the LED-backlit unit is controlled, thereby reduce power consumption, improves contrast.
Preferably, chip for driving 204 comes each LED in the LED lamp bar 306 is controlled according to the reference clock CLK signal and the data DATA signal that are provided by system board 206.
In addition, the utility model also provides a kind of LCD TV, comprising: liquid crystal display screen is arranged on the user oriented side of LCD TV; LED-backlit unit 306 is arranged in the LCD TV, is used to liquid crystal display screen light source is provided; Power supply 208 is used to the LCD TV power supply; LED drive plate 202 is connected electrically between power supply 208 and the LED-backlit unit 306, is used for driving LED back light unit 306; And system board 206, be electrically connected with power supply 208 and LED drive plate 202.
Wherein, power supply 208 is integrated into power supply and drive unit 200 integratedly with LED drive plate 202, the two integrated plate can be called power supply-LED and drive integrated board.
Preferably, LED drive plate 202 comprises: the constant-current source circuit (not shown) is electrically connected to the LED-backlit unit; And LED chip for driving 204, be electrically connected to the LED-backlit unit.
Preferably, power supply 208 comprises: rectification-power factor correction pfc circuit is electrically connected to power supply 208; Transformer reverse exciting switching voltage regulator circuit is electrically connected to rectification-power factor correction pfc circuit; And rectification-filter circuit, be connected electrically between transformer reverse exciting switching voltage regulator circuit and the LED-backlit unit 306.
Preferably, chip for driving 204 comes each LED in the LED-backlit unit 306 is controlled according to the reference clock CLK signal and the data DATA signal that are provided by system board 206.
With comparing of prior art; The two-in-one power supply of the utility model-multi-channel LED driving IC chip power circuit; After exchanging input by 220V through rectification-PFC (power factor correction) circuit with all the boost direct voltage of the peak value that becomes to be higher than alternating voltage of the voltage after the filtering; Through transformer reverse exciting switching voltage regulator circuit this direct voltage is processed into square wave again; And then square wave is treated to the direct voltage that is suitable for the work of LED lamp bar by current rectifying and wave filtering circuit, give load with stable voltage transmission.LED can be normally luminous.Constant-current source circuit can select the IC chip of external MOSFET (metal oxide semiconductor field effect tube) to carry out work simultaneously, guarantees a constant current delivery to LED, thereby guarantees the operate as normal of LED lamp bar.Meanwhile; Reference CLK (clock) and DATA (data) signal of chip for driving through providing by machine core board (being system board); Make LED lamp bar carry out bright dark control according to DATA; Therefore when improving power supply conversion efficiency, increase the purpose of LED local dimming (local dimming), made the LED-backlit power supply reduce power consumption.
Meanwhile, save the output that converts direct current 24V by 220 interchanges into, boosted to the voltage of LED lamp bar again by 24v; But directly convert the direct voltage that LED lamp bar needs to through the 220V ac buck; 70V for example, therefore, the energy conversion efficiency aspect obtains one and well promotes.
The key point of the utility model patent is the circuit design of power panel and LED constant-current driving plate, has cancelled the transition status of middle DC/DC (DC-DC) circuit, and has changed the direct-current working volts of directly being exported LED lamp bar by transformer.And the research and development and the conceptual design of LED constant-current driving plate LED driving IC chip, the selection of chip for driving and research and development.
In the utility model; The two organically combines with power panel and LED drive plate; The two rat tail that originally needed can be cancelled, and has saved the material cost of wire harness, thereby and has avoided because the unreasonable problem of disturbing other elements or signal of cabling mode.
In the utility model; The two organically combines with power panel and LED drive plate; Circuit framework transforms to a certain direct voltage (for example 24V direct voltage) earlier from original being exchanged by 220V, and then is transformed to LED lamp bar operation dc voltage (for example 60V direct voltage) by the 24V direct current through DC/DC (DC-DC) circuit, gives LED drive plate circuit supply by the 60V direct current at last; Change to by the 220V interchange and convert directly to LED lamp bar operation dc voltage (for example 60V direct voltage); Give LED drive plate circuit supply, a certain direct voltage (for example 24V direct voltage) is transformed to the transition status of LED lamp bar operation dc voltage (for example 60V direct voltage) through DC/DC (DC-DC) circuit in the middle of having cancelled, so; Significantly reduced indirect energy loss, power-efficient also increases.
Increase the design circuit of LED local dimming function simultaneously, increased the control signal circuit, reached the function of LED local dimming; So this utility model patent LED driving IC chip power supply has had very big improvement and development with respect to power supply and Driving technique before, has removed redundant part; Increased the conversion efficiency of power panel; Also increased the viewing effect of LCD TV, and contrast, make power consumption be reduced to the energy-conservation index that country advocates.Development to the color television set industry has very big impetus.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (8)
1. a power supply and a drive unit that is used for LED-backlit is characterized in that, is integrated with the power supply and the LED drive plate that are used for the LED-backlit unit on said power supply and the drive unit integratedly.
2. according to said power supply of claim 1 and drive unit, it is characterized in that the said power supply that is used for the LED-backlit unit comprises:
Rectification-power factor correction pfc circuit is electrically connected to outside 220V AC power;
Transformer reverse exciting switching voltage regulator circuit is electrically connected to said rectification-power factor correction pfc circuit; And
Rectification-filter circuit is connected electrically between said transformer reverse exciting switching voltage regulator circuit and the said LED-backlit unit.
3. according to said power supply of claim 1 and drive unit, it is characterized in that said LED drive plate comprises:
Constant-current source circuit is electrically connected to said LED-backlit unit; And;
The LED chip for driving is electrically connected to said LED-backlit unit.
4. power supply according to claim 3 and drive unit is characterized in that, said chip for driving comes each LED in the said LED-backlit unit is controlled according to the reference clock CLK signal and the data DATA signal that are provided by system board.
5. LCD TV comprises:
Liquid crystal display screen is arranged on the user oriented side of said LCD TV;
The LED-backlit unit is arranged in the said LCD TV, is used to said liquid crystal display screen light source is provided;
Power supply is used to said LCD TV power supply;
The LED drive plate is connected electrically between said power supply and the said LED-backlit unit, is used to drive said LED-backlit unit; And
System board is electrically connected with said power supply and said LED drive plate,
It is characterized in that,
Said power supply and said LED drive plate are integrated into power supply and drive unit integratedly.
6. LCD TV according to claim 5 is characterized in that, said LED drive plate comprises:
Constant-current source circuit is electrically connected to said LED-backlit unit; And
The LED chip for driving is electrically connected to said LED-backlit unit.
7. LCD TV according to claim 5 is characterized in that, said power supply comprises:
Rectification-power factor correction pfc circuit is electrically connected to said power supply;
Transformer reverse exciting switching voltage regulator circuit is electrically connected to said rectification-power factor correction pfc circuit; And
Rectification-filter circuit is connected electrically between said transformer reverse exciting switching voltage regulator circuit and the said LED-backlit unit.
8. LCD TV according to claim 6 is characterized in that, said chip for driving comes each LED in the said LED-backlit unit is controlled according to the reference clock CLK signal and the data DATA signal that are provided by said system board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201381676U CN202197355U (en) | 2011-05-04 | 2011-05-04 | Power supply and driving device used for LED backlight and liquid crystal television comprising the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201381676U CN202197355U (en) | 2011-05-04 | 2011-05-04 | Power supply and driving device used for LED backlight and liquid crystal television comprising the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202197355U true CN202197355U (en) | 2012-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201381676U Expired - Lifetime CN202197355U (en) | 2011-05-04 | 2011-05-04 | Power supply and driving device used for LED backlight and liquid crystal television comprising the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202197355U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752567A (en) * | 2012-07-25 | 2012-10-24 | 广州视源电子科技股份有限公司 | Television driving device |
| CN104575324A (en) * | 2015-01-06 | 2015-04-29 | 深圳市维冠视界科技有限公司 | Movable advertising machine with continuous power supply system |
| CN105895033A (en) * | 2016-06-13 | 2016-08-24 | 青岛海信电器股份有限公司 | Multi-partition backlight drive circuit and display device |
| CN111258103A (en) * | 2020-03-27 | 2020-06-09 | 深圳市华星光电半导体显示技术有限公司 | Display panel |
-
2011
- 2011-05-04 CN CN2011201381676U patent/CN202197355U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752567A (en) * | 2012-07-25 | 2012-10-24 | 广州视源电子科技股份有限公司 | Television driving device |
| CN102752567B (en) * | 2012-07-25 | 2015-07-15 | 广州视源电子科技股份有限公司 | Television driving device |
| CN104575324A (en) * | 2015-01-06 | 2015-04-29 | 深圳市维冠视界科技有限公司 | Movable advertising machine with continuous power supply system |
| CN105895033A (en) * | 2016-06-13 | 2016-08-24 | 青岛海信电器股份有限公司 | Multi-partition backlight drive circuit and display device |
| CN111258103A (en) * | 2020-03-27 | 2020-06-09 | 深圳市华星光电半导体显示技术有限公司 | Display panel |
| CN111258103B (en) * | 2020-03-27 | 2021-07-06 | 深圳市华星光电半导体显示技术有限公司 | Display panel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151120 Address after: 266101 Haier Industrial Park, No. 1, Haier Road, hi tech park, Laoshan District, Shandong, China Patentee after: haier group corporation Patentee after: Qingdao Haier Photoelectric Co., Ltd. Patentee after: Qingdao Haier Electric Appliance Co., Ltd. Patentee after: Qingdao Jiaonan Haier Electronic Co., Ltd. Patentee after: Hefei Haier Information Product Co., Ltd. Patentee after: QINGDAO HAIER MULTI-MEDIA CO., LTD. Address before: 266101 Haier Industrial Park, No. 1, Haier Road, hi tech park, Laoshan District, Shandong, China Patentee before: haier group corporation Patentee before: Qingdao Haier Photoelectric Co., Ltd. Patentee before: Qingdao Haier Electric Appliance Co., Ltd. Patentee before: Qingdao Jiaonan Haier Electronic Co., Ltd. Patentee before: Hefei Haier Information Product Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20120418 |
|
| CX01 | Expiry of patent term |