CN101826803B - Independent power supply module of liquid crystal display - Google Patents
Independent power supply module of liquid crystal display Download PDFInfo
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- CN101826803B CN101826803B CN200910118909A CN200910118909A CN101826803B CN 101826803 B CN101826803 B CN 101826803B CN 200910118909 A CN200910118909 A CN 200910118909A CN 200910118909 A CN200910118909 A CN 200910118909A CN 101826803 B CN101826803 B CN 101826803B
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- module
- power supply
- backlight
- voltage
- supply
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- 239000004973 liquid crystal related substance Substances 0.000 title abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 14
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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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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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention discloses a power supply module of a liquid crystal display, which comprises a system power supply module and a backlight power supply module. The system power supply module is used for driving a panel module of the liquid crystal display. The backlight power supply module converts an alternating-current input voltage into a direct-current voltage by using a power factor corrector, and converts the direct-current voltage into an alternating-current driving voltage by using a direct-current/ alternating-current converter to drive a backlight module of the liquid crystal display. The power supply module can support a plurality of liquid crystal displays.
Description
Technical field
The invention relates to a kind of power supply supply module of LCD, more particularly, the invention relates to and a kind ofly supply module and the system power supply supply module power supply supply module of the LCD of independent separately backlight electric power.
Background technology
Please refer to Fig. 1, Fig. 1 is LCD (Liquid Crystal Display, the sketch map of power supply supply module LCD) of prior art.LCD comprises a template die group 140 and a module 150 backlight.Module 150 backlight comprise a plurality of cathode fluorescent tubes (Cold Cathode FluorescentLight, CCFL).The power supply supply module of LCD comprises a system power supply supply 120 and one direct current/alternating-current converter (DC/AC inverter) 130.System power supply supply 120 comprises a power factor corrector (Power Factor Correction, PFC) 121, one DC-DC converter 122 and DC-DC conversion module 123.DC-DC converter 122 and DC/DC conversion module 123 are electrically connected at power factor corrector 121.Power factor corrector 121 is electrically connected at input ac voltage V
AC, be used for producing a direct current voltage V
DCDC/DC conversion module 123 comprises one 3.3 volt dc/direct current transducer 1231, one 5 volt dc/direct current transducer 1232 and one 12 volt dc/direct current transducer 1233.Therefore, DC/DC conversion module 123 can be according to direct voltage V
DCProduce the required direct voltage of panel module 140.In general, panel module 140 required direct voltages are 3.3 volts, 5 volts and 12 volts.DC/DC conversion module 123 can produce corresponding voltage according to the demand of panel module 140.AC/DC converter 130 is electrically connected at DC-DC converter 122, is used for producing an ac drive voltage V
AC_DRIVETo drive module 150 backlight.AC/DC converter 130 uses 24 volts DC input voitage, thus system power supply supply 120 by DC-DC converter 122 with direct voltage V
DCConvert 24 volts direct voltage into, to provide AC/DC converter 130 required DC input voitage.Yet the direct voltage conversion of secondary will make electric energy efficiency reduce.
System power supply supply 120 provides panel module 140 required direct voltage (in general, panel module 140 required direct voltages are 3.3 volts, 5 volts and 12 volts), and AC/DC converter 130 provides module backlight 150 required voltage V
AC_DRIVEYet; Formerly in the technology; AC/DC converter 130 employed 24 volts are to utilize 122 generations of DC-DC converter of system power supply supply 120, so the driving voltage of panel module 140 and module backlight 150 all needs the conversion of process system power supply supply 120 earlier.Therefore, the design demand of system power supply supply 120 meets the power demand of module 150 backlight, and the power designs of module backlight 150 also can be limited by system power supply supply 120.In other words, system power supply supply and module backlight when design except needs with respect to power demand separately, also must cooperate corresponding system power supply supply and module backlight.
Summary of the invention
Therefore, a purpose of the present invention promptly is to provide a kind of power supply supply module of LCD.
The present invention discloses a kind of power supply of LCD supply module, and this LCD comprises a display floater, a module backlight and a circuit system.This power supply supply module comprises a backlight electric power supply and a system power supply supply.This backlight electric power supply comprises a power factor (PF) rectifier; Be used for converting one first alternating voltage into one first direct voltage; And one direct current/alternating-current converter, be electrically connected at this module backlight, be used for converting this first direct voltage into one second alternating voltage.This system power supply supply comprises an ac/dc rectifier; Be used for converting this first alternating voltage into one second direct voltage; And a DC-DC conversion module, electrically connect this circuit system, be used for converting this second direct voltage into one the 3rd direct voltage.
The present invention also discloses the power supply supply module of a LCD, and this LCD comprises one first display floater, one first module backlight, one first circuit system, one second display floater, one second module backlight and one second circuit system.This power supply supply module comprises one first backlight electric power supply, one second backlight electric power supply and a system power supply supply.This first backlight electric power supply comprises one first power factor (PF) rectifier; Be used for converting one first alternating voltage into one first direct voltage; And one first AC/DC converter, be electrically connected at this first module backlight, be used for converting this first direct voltage into one second alternating voltage.The second backlight electric power supply comprises one second power factor (PF) rectifier; Be used for converting this first alternating voltage into one second direct voltage; And one second AC/DC converter, be electrically connected at this second module backlight, be used for converting this second direct voltage into one second alternating voltage.This system power supply supply comprises a dc rectifier; Be used for converting this first alternating voltage into one the 3rd direct voltage; And stream translation module always, be electrically connected at this first circuit system and this second circuit system, be used for converting the 3rd direct voltage into one the 4th direct voltage.
Description of drawings
Fig. 1 is the sketch map that the power supply of the LCD of prior art is supplied module.
Fig. 2 is the sketch map that the power supply of LCD of the present invention is supplied first embodiment of module.
Fig. 3 is the sketch map that the power supply of LCD of the present invention is supplied second embodiment of module.
Fig. 4 is the sketch map that the power supply of LCD of the present invention is supplied the 3rd embodiment of module.
[primary clustering symbol description]
120 system power supply supplies
121,231 power factor correctors
122,1231,1232,1233, DC-DC converter
2221、2222、2223
123,222 DC-DC converter modules
130,232 AC/DC converters
140,240,340,451,461 panel modules
150,250,350,452,462 modules backlight
220,320,420 system power supplies supply module
221 ac/dc rectifiers
230,330,430,440 backlight electric powers supply module
360 balancing circuitrys
V
AC, V
AC_DRIVE, V
AC_DRIVE1, V
AC_DRIVE_2AC signal
V
DC, V
DC_1, V
DC_2Direct current signal
X, Y LCD
Embodiment
In the middle of specification and above-mentioned claim, used some vocabulary to censure specific assembly.Having common knowledge the knowledgeable in the affiliated field should understand, and same assembly may be called with different nouns by manufacturer.This specification and above-mentioned claim are not used as distinguishing the mode of assembly with the difference of title, but the benchmark that is used as distinguishing with the difference of assembly on function.Be to be an open term mentioned " comprising " in the middle of specification and the above-mentioned claim in the whole text, so should be construed to " comprise but be not limited to ".In addition, " electric connection " speech is to comprise any indirect means that are electrically connected that directly reach at this.Therefore, be electrically connected at one second device, then represent this first device can be directly connected in this second device, or be connected to this second device through other device or the intersegmental ground connection of connection hand if describe one first device in the literary composition.
Please refer to Fig. 2, Fig. 2 is the sketch map that the power supply of LCD of the present invention is supplied first embodiment of module.Power supply supply module comprises system power supply supply module 220 and backlight electric power supply module 230.LCD comprises a template die group 240 and a module 250 backlight.Module 250 backlight comprise a plurality of cathode fluorescent tubes (Cold Cathode Fluorescent Light, CCFL).System power supply supply module 220 can be with an AC-input voltage V
ACConvert the required direct voltage of panel module 240 into.In general, panel module 240 required direct voltages are 3.3 volts, 5 volts and 12 volts.System power supply supply module 220 comprises an ac/dc rectifier (AC/DC rectifier) 221 and one DC-DC conversion module 222.Ac/dc rectifier 221 is with AC-input voltage V
ACConvert a direct current voltage V into
DC_1DC/DC conversion module 222 is electrically connected at ac/dc rectifier 221, comprises one 3.3 volt dc/direct current transducer 2221, one 5 volt dc/direct current transducer 2222 and one 12 volt dc/direct current transducer 2223.Therefore, DC/DC conversion module 222 can be according to direct voltage V
DC_1Produce the required direct voltage of panel module 240.General panel module 240 required direct voltages are 3.3 volts, 5 volts and 12 volts, and DC/DC conversion module 222 can produce corresponding voltage according to the demand of panel module 240.
Backlight electric power supply module 230 comprises a power factor corrector 231 and one direct current/alternating-current converter 232.Power factor corrector 231 can be with AC-input voltage V
ACConvert a direct current voltage V into
DC_2And rectifiable this alternating voltage V
AC Power factor.AC/DC converter 232 is electrically connected at power factor corrector 231, is used for direct voltage V
DC_2Convert an ac drive voltage V into
AC_DRIVE, to drive module 250 backlight.In the present embodiment, backlight electric power supply module 230 provides module backlight 250 required voltage, and backlight electric power supply module 230 utilizes power factor corrector 231 with AC-input voltage V
ACConvert direct voltage V into
DC_2, and system power supply supply module 220 provides panel module 240 required direct voltage, system power supply supply module 220 utilizes ac/dc rectifier 221 with AC-input voltage V
ACConvert direct voltage V into
DC_1Therefore, backlight electric power supply module 230 and system power supply supply module 220 can independently convert alternating voltage into direct voltage.
Compared to prior art, the design of system power supply supply of the present invention need not cooperate the power demand of module backlight, and the power designs of module backlight can not limited by the system power supply supply yet.In other words, system power supply supply module and module backlight can only consider that required separately power does design, and need not change or the specification of restriction itself to cooperate the system power supply supply and the module backlight of correspondence.In addition, because system power supply supply module need not considered the required power supply of module backlight, the power requirements of system power supply supply module can significantly reduce.System power supply supply module only need utilize the ac/dc rectifier to convert AC-input voltage into direct voltage, need not utilize power factor corrector to correct the power factor of AC-input voltage.
Please refer to Fig. 3, Fig. 3 is the sketch map that the power supply of LCD of the present invention is supplied second embodiment of module.LCD comprises a template die group 340 and a module 350 backlight.Power supply supply module comprises system power supply supply module 320, backlight electric power supply module 330 and a balancing circuitry 360.Module 350 backlight comprises a plurality of cathode fluorescent tubes; Because the impedance of each fluorescent tube is different; Each lamp tube current that causes flowing through is inconsistent; The existence of adding parasitic capacitance in the module backlight can form leakage current, and each lamp tube current of flowing through that also can make is inhomogeneous, and then influences the image quality performance of panel.In the present embodiment, balancing circuitry 360 can reduce the influence that resistance and leakage current cause, and so that the current error between each fluorescent tube is controlled in the specification allowed band, and effectively improves the image quality performance of panel.As shown in Figure 3, balancing circuitry 360 is electrically connected between backlight electric power supply module 330 and the module backlight 350, is used for improving the current balance type property of this module 350 backlight.The intraware running of system power supply supply module 320 and backlight electric power supply module 330 and function and first embodiment are similar, repeat no more in this.
Please refer to Fig. 4, Fig. 4 is the sketch map that the power supply of LCD of the present invention is supplied the 3rd embodiment of module.In the 3rd embodiment, the power supply of LCD supply module can provide two power supplys that LCD is required.The first LCD X comprises one first panel module 451 and one first module 452 backlight.The second LCD Y comprises one second panel module 461 and one second module 462 backlight.Power supply supply module comprises system power supply supply module 420, one first backlight electric power supply module 430 and one second backlight electric power supply module 440.As shown in Figure 4, first backlight electric power supply module 430 is with an AC-input voltage V
ACConvert an ac drive voltage V into
AC_DRIVE_1, to drive first module 452 backlight.Second backlight electric power supply module 440 is with AC-input voltage V
ACConvert an ac drive voltage V into
AC_DRIVE_2, to drive second module 462 backlight.Because the employed power of module backlight is much larger than the panel module; Therefore power supply supply module of the present invention provides the required power supply of module backlight 452,462 of LCD X, Y respectively by backlight electric power supply module 430,440 independently, and panel module 451,461 is the power supply that provided of shared system power supply supply module 420 then.System power supply supply module 420 is with this AC-input voltage V
ACConvert the required direct voltage V of this first panel module 451 and this second panel module 452 into
1And V
2System power supply supply module 420 can produce corresponding voltage according to the demand of the first panel module 451 and the second panel module 452.For example, the first panel module 451 and the required respectively direct voltage of the second panel module 452 are 3.3 volts, 5 volts and 12 volts.That is to say direct voltage V
1And V
2Can comprise 3.3 volts, 5 volts and 12 volts respectively.Therefore, the power supply of LCD of the present invention supply module can be used to drive a plurality of liquid crystal devices.System power supply of the present invention supply module be with backlight electric power supply module be independent separately running.The intraware running and the function of system power supply supply module 420, first backlight electric power supply module 430 and second backlight electric power supply module 440 are similar with above-mentioned Fig. 2 embodiment, do not give unnecessary details in this.
In sum, the present invention provides a kind of power supply supply module of LCD, and this power supply supply module comprises system power supply supply module and backlight electric power supply module.This system power supply is supplied the panel module that module is used for the driving liquid crystal device.This backlight electric power supply module utilizes a power factor (PF) rectifier to convert an AC-input voltage into a direct current voltage, utilizes one direct current/alternating-current converter that this direct voltage is changed an ac drive voltage again, is used for the module backlight of driving liquid crystal device.This power supply supply module can be supported a plurality of LCDs.Therefore; Of the present inventionly supply module and system power supply supply module independent separately with backlight electric power; To reach with the power supply module of the power supply module of module backlight and the panel module purpose of independent separately; Except the design of backlight electric power supply module and system power supply supply module need not change or the specification of restriction itself to cooperate corresponding system power supply supply and module backlight, can significantly reduce the power requirements that system power supply is supplied module in addition.
The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (5)
1. the power supply of a LCD is supplied module; This LCD comprises one first display floater, one first module backlight, one first circuit system, one second display floater, one second module backlight and one second circuit system, and this power supply supply module comprises:
One first backlight electric power supply comprises:
One first power factor (PF) rectifier is used for converting one first alternating voltage into one first direct voltage; And
One first AC/DC converter is electrically connected at this first module backlight, is used for converting this first direct voltage into one second alternating voltage;
One second backlight electric power supply comprises:
One second power factor (PF) rectifier is used for converting this first alternating voltage into one second direct voltage; And
One second AC/DC converter is electrically connected at this second module backlight, is used for converting this second direct voltage into one second alternating voltage; And
One system power supply supply comprises:
One ac/dc rectifier is used for converting this first alternating voltage into one the 3rd direct voltage; And
One DC-DC conversion module is electrically connected at this first circuit system and this second circuit system, is used for converting the 3rd direct voltage into one the 4th direct voltage.
2. power supply supply module as claimed in claim 1 is characterized in that this DC/DC conversion module comprises one 3.3 volt dc/direct current transducer, one 5 volt dc/direct current transducer and one 12 volt dc/direct current transducer.
3. power supply supply module as claimed in claim 1 is characterized in that the power of this first module backlight is the power that the phase XOR is same as this second module backlight.
4. power supply supply module as claimed in claim 1, wherein this first module backlight and this second module backlight are all the backlight of cathode fluorescent tube.
5. power supply supply module as claimed in claim 1; It is characterized in that; Also comprise one first balancing circuitry and be electrically connected between this first backlight electric power supply and this first module backlight, and one second balancing circuitry is electrically connected between this second backlight electric power supply and this second module backlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910118909A CN101826803B (en) | 2009-03-06 | 2009-03-06 | Independent power supply module of liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910118909A CN101826803B (en) | 2009-03-06 | 2009-03-06 | Independent power supply module of liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101826803A CN101826803A (en) | 2010-09-08 |
| CN101826803B true CN101826803B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910118909A Expired - Fee Related CN101826803B (en) | 2009-03-06 | 2009-03-06 | Independent power supply module of liquid crystal display |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560575B (en) | 2013-11-12 | 2015-10-21 | 京东方科技集团股份有限公司 | A kind of electric supply installation and electronic equipment |
| CN107509239A (en) * | 2017-08-30 | 2017-12-22 | 努比亚技术有限公司 | Screen display method, mobile terminal and computer-readable medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1522382A (en) * | 2001-07-03 | 2004-08-18 | ���ǵ�����ʽ���� | Device for supplying power and liquid crystal display having the same |
| CN1606395A (en) * | 2003-10-03 | 2005-04-13 | 夏普株式会社 | Drive system and AC conversion apparatus |
| TW200536245A (en) * | 2004-04-26 | 2005-11-01 | Delta Electronics Inc | New structured power supply system for a LCD apparatus |
| CN1741361A (en) * | 2004-08-27 | 2006-03-01 | 三星电子株式会社 | Power supply apparatus and method |
| CN1882210A (en) * | 2005-06-17 | 2006-12-20 | 鸿富锦精密工业（深圳）有限公司 | Power supply system |
| CN200990566Y (en) * | 2006-11-02 | 2007-12-12 | 四川长虹电器股份有限公司 | Insulating electric power inverter |
-
2009
- 2009-03-06 CN CN200910118909A patent/CN101826803B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1522382A (en) * | 2001-07-03 | 2004-08-18 | ���ǵ�����ʽ���� | Device for supplying power and liquid crystal display having the same |
| CN1606395A (en) * | 2003-10-03 | 2005-04-13 | 夏普株式会社 | Drive system and AC conversion apparatus |
| TW200536245A (en) * | 2004-04-26 | 2005-11-01 | Delta Electronics Inc | New structured power supply system for a LCD apparatus |
| CN1741361A (en) * | 2004-08-27 | 2006-03-01 | 三星电子株式会社 | Power supply apparatus and method |
| CN1882210A (en) * | 2005-06-17 | 2006-12-20 | 鸿富锦精密工业（深圳）有限公司 | Power supply system |
| CN200990566Y (en) * | 2006-11-02 | 2007-12-12 | 四川长虹电器股份有限公司 | Insulating electric power inverter |
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| Publication number | Publication date |
|---|---|
| CN101826803A (en) | 2010-09-08 |
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Granted publication date: 20120905 |