CN101042476A - Driving system of LCD and power supply - Google Patents
Driving system of LCD and power supply Download PDFInfo
- Publication number
- CN101042476A CN101042476A CN 200610060006 CN200610060006A CN101042476A CN 101042476 A CN101042476 A CN 101042476A CN 200610060006 CN200610060006 CN 200610060006 CN 200610060006 A CN200610060006 A CN 200610060006A CN 101042476 A CN101042476 A CN 101042476A
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Abstract
This invention relates to one power drive system for LCD device, which comprises the following parts as: one power circuit to provide needed voltage for the device; one reverse converter to convert the outer power input voltage alternating electricity into low voltage direct current electricity to multiple path output as the needed work voltage for the LCD device.
Description
[technical field]
The LCD that the present invention relates to a kind of power drives system and use this power drives system.
[background technology]
(liquid crystal display LCD) has advantages such as low in energy consumption, lightening, has been widely used in the electronic products such as PC, personal digital assistant and mobile phone owing to LCD.
Seeing also Fig. 1, is the electrical block diagram of a kind of LCD of prior art.This LCD 10 comprises a power drives system 11, a Based Intelligent Control plate (Smart Panel) 16 and one liquid crystal display module 18.This power drives system 11 provides required power supply for this LCD 10.This Based Intelligent Control plate 16 is used for controlling the driving circuit of this liquid crystal display module 18.
This power drives system 11 comprises feed circuit 12 and a power control circuit 14.These feed circuit 12 are used for providing working power to this power control circuit 14, this Based Intelligent Control plate 16.The voltage of this feed circuit 12 outputs is through these power control circuit 14 lifting/voltage reducings, and then exports this liquid crystal display module 18 required main operating voltage AVDD, grid operating voltage VGH (High-level Gate Voltage) and VGL (Low-levelGate Voltage).Wherein, main operating voltage AVDD is the high voltage/electric current output that drives OTFT, its magnitude of voltage is generally+5.xV or+12.xV; Grid operating voltage VGH is the high voltage output that makes the OTFT bias voltage, i.e. forward voltage, its magnitude of voltage is generally+15.xV or+24.xV; Grid operating voltage VGL is the reverse voltage output that makes the OTFT reverse biased, i.e. shutoff voltage, its magnitude of voltage be generally-10.xV or-6.xV, x is any natural number.
These feed circuit 12 comprise 121, two groups of DC-to-DC converter of a rectification circuit (Rectifier) (DC-DC Converter), 122 and one phase inverter (Inverter) 123.This rectification circuit 121 will be exported a high voltage direct current from the 110/220V high-voltage alternating electric rectification of external power source (figure does not show), two groups of DC-to-DC converter 122 are exported two groups of low-voltage DCs with this high voltage direct current step-down again, and its magnitude of voltage is respectively+5V and+12V.Wherein, the low-voltage DC of+12V drive this phase inverter 123 and oppositely inversions export a High Level AC Voltage so that (Cold Cathode Fluorescent Lamp CCFL) 19 provides working power to the cold cathode fluorescent tube of these LCD 10 modules backlight.The low-voltage DC of+5V provides operating voltage for the Based Intelligent Control plate 16 of this LCD 10.
This liquid crystal display module 18 comprises a pel array 181, one source pole driving circuit 182 and a gate driver circuit 183.This source electrode drive circuit 182 and this gate driver circuit 183 common these pel arrays 181 that drive.This gate driver circuit 183 need receptions+15.xV or+the grid operating voltage VGH of 24.xV and-10.xV or-the grid operating voltage VGL of 6.xV, thereby the output scanning signal is to this pel array 181.This source electrode drive circuit 182 need reception+5.xV or+the main operating voltage AVDD of 12.xV, thereby outputting data signals is to this pel array 181.
This Based Intelligent Control plate 16 comprises one scan convergent-divergent circuit (Scalar Board) 161 and time schedule controller (Timing Control) 162.This scanning convergent-divergent circuit 161 is used for receiving processing Low Voltage Differential Signal (Low Voltage Differential signaling, LVDS) or transition minimized differential signaling (Transition MinimizedDifferential Signaling, and output switching signal TMDS) and vision signal.This time schedule controller 162 is used for controlling the source electrode drive circuit 182 and gate driver circuit 183 of this liquid crystal display module 18, and then makes this pel array 181 display images.
This power control circuit 14 comprises a pulse-width modulation circuit (Pulse WidthModulation, PWM) 141, one reduction voltage circuit 142 and a booster circuit (ChargePumping Circuit) 143.The switching signal of these scanning convergent-divergent circuit 161 outputs utilizes the circuit board of this power control circuit 14 to walk the break-make of this pulse-width modulation circuit 141 of line traffic control, this pulse-width modulation circuit 141 cooperates the buck function of this booster circuit 143 simultaneously, common main operating voltage AVDD and grid operating voltage VGH and the VGL that drives this liquid crystal display module 18 that form.This reduction voltage circuit 142 also cooperates this scanning convergent-divergent circuit 161 these time schedule controllers 162 of control.
The power drives system 11 of above-mentioned LCD 10, be to adopt pulse-width modulation circuit 141 and will scan the switching signal that convergent-divergent circuit 161 exports to convert the plurality of voltages signal to, and then the operating voltage of this liquid crystal display module 18 of driving is provided in conjunction with booster circuit 143.But,, cause the cost of this power drives system 11 higher, thereby cause using LCD 10 costs of this power drives system 11 higher because circuit structure complexity, the cost of this pulse-width modulation circuit 141 are higher.
[summary of the invention]
In order to solve the power drives system cost problem of higher that prior art is applied to LCD, be necessary to provide a kind of lower-cost power drives system.
In addition, cause LCD cost problem of higher because of the power drives system cost is higher, also be necessary to provide a kind of LCD with low-cost power drives system in order to solve prior art.
A kind of power drives system that is applied to LCD, it comprises feed circuit, these feed circuit provide required voltage for this LCD, it comprises a flyback converter, this flyback converter will be directly changed into the low-voltage DC of multichannel output by the High Level AC Voltage of external power source input, and this multichannel low-voltage DC is as driving each required operating voltage of this LCD.
A kind of LCD, it comprises that a liquid crystal display module, is used to control Based Intelligent Control plate that this liquid crystal display module image shows and and provides the power drives system of power supply for this liquid crystal display module and Based Intelligent Control plate.This power drives system comprises feed circuit, these feed circuit are used for providing required operating voltage to this liquid crystal display module and this Based Intelligent Control plate, it comprises a flyback converter, this flyback converter will be directly changed into the low-voltage DC of multichannel output by the High Level AC Voltage of external power source input, and this multichannel low-voltage DC is as each required operating voltage of this liquid crystal display module.
Compared with prior art, this power drives system adopts a flyback converter to realize the conversion of high-voltage alternating input to the output of multichannel low-voltage direct, and then provides operating voltage to the liquid crystal display module of this LCD.Because this flyback converter is to utilize cheap electronic component to constitute, so the cost of this power drives system is lower, thereby has also reduced the cost of the LCD of using this power drives system.
[description of drawings]
Fig. 1 is the electrical block diagram of a kind of LCD of prior art.
Fig. 2 is the electrical block diagram of LCD one better embodiment of the present invention.
[embodiment]
Fig. 2 is the electrical block diagram of LCD one better embodiment of the present invention.This LCD 20 comprises a power drives system 21, a Based Intelligent Control plate 26 and a liquid crystal display module 28.This power drives system 21 provides power supply for this LCD 20.This Based Intelligent Control plate 26 is used for controlling the driving circuit of this liquid crystal display module 28.
This liquid crystal display module 28 comprises a pel array 281, one source pole driving circuit 282 and a gate driver circuit 283.This source electrode drive circuit 282 and gate driver circuit 283 common these pel arrays 281 that drive.This gate driver circuit 283 need receptions+15.xV or+the grid operating voltage VGH of 24.xV and-10.xV or-the grid operating voltage VGL of 6.xV, thereby the output scanning signal is to this pel array 281.This source electrode drive circuit 282 need reception+5.xV or+the main operating voltage AVDD of 12.xV, thereby outputting data signals is to this pel array 281.
This Based Intelligent Control plate 26 comprises one scan convergent-divergent circuit 261 and time schedule controller 262.This scanning convergent-divergent circuit 261 is used for receiving handles Low Voltage Differential Signal or transition minimized differential signaling and vision signal, and output switching signal.This time schedule controller 262 is used for controlling the source electrode drive circuit 282 and gate driver circuit 283 of this liquid crystal display module 28, thereby makes this pel array 281 display images.
This power drives system 21 comprises feed circuit 22 and a power control circuit 24.
These feed circuit 22 comprise a bridge joint filtering circuit (Bridge Filter Circuit) 221, one phase inverter 223 and a flyback converter (Flyback Converter) 224.
This bridge joint filtering circuit 221 will carry out filtering from the 110/220V High Level AC Voltage of external power source, thereby export stable High Level AC Voltage.
This flyback converter 224 single-ended flyback converter that is otherwise known as, it is made up of elements such as inductance, electric capacity, and utilizing coupling inductance to realize the buck-boost type converter with isolation characteristic of energy conversion, it can be converted into one group of High Level AC Voltage input the low-voltage DC output of multichannel.When the 110V/220V alternating current of exporting after 221 filtering of process bridge joint filtering circuit is imported this flyback converter 224, utilize the coupling inductance of many groups of different turn ratios of this flyback converter 224 can the many groups of corresponding output low-voltage DCs, the low-voltage DC of its output mainly comprises: be used for driving this Based Intelligent Control plate 26+the 5V low-voltage DC, be used for driving phase inverter 223+the 12V low-voltage DC, drive this source electrode drive circuit 282 and gate driver circuit 283 required main operating voltage AVDD and grid operating voltage VGH and VGL.
This phase inverter 223 will import+the reverse inversion of 12V low-voltage DC and export a High Level AC Voltage, and this High Level AC Voltage is used for providing working power to the cold cathode fluorescent tube 29 of this LCD 20 modules backlight.
This power control circuit 24 comprises a reduction voltage circuit 242, and this reduction voltage circuit 242 cooperates this scanning convergent-divergent circuit 261 these time schedule controllers 262 of control, and will import+step-down of 5V low-voltage DC converts to+3.3V or+low-voltage DC of 1.8V.Should+3.3V or+low-voltage DC of 1.8V is used to provide this source electrode drive circuit 282 and the required voltage of gate driver circuit 283 portions of electronics elements.
This LCD 20 adopts these flyback converters 224 to realize the output of multichannel low-voltage direct, and the low-voltage DC that obtains is used to provide each required operating voltage of this liquid crystal display module 28.Because these flyback converter 224 circuit are to be made of price lower inductance and capacity cell, can reduce the cost of this power drives system 21, thereby reduce the cost of this LCD 20.
Claims (10)
1. power drives system that is applied to LCD, it comprises feed circuit, these feed circuit provide required voltage for this LCD, it is characterized in that: these feed circuit comprise a flyback converter, it will be directly changed into the low-voltage DC of multichannel output by the High Level AC Voltage of external power source input, and this multichannel low-voltage DC is as driving each required operating voltage of this LCD.
2. the power drives system that is applied to this LCD as claimed in claim 1, it is characterized in that: this flyback converter is the coupled circuit that is made of through connection in series-parallel resistance, inductance and capacity cell, and utilizes coupling inductance to realize the buck-boost type converter of energy conversion purpose.
3. the power drives system that is applied to this LCD as claimed in claim 1, it is characterized in that: these feed circuit also comprise a bridge joint filtering circuit, this bridge joint filtering circuit is used for the high voltage direct current of externally-originated power supply is carried out filtering, so that stable High Level AC Voltage to be provided.
4. the power drives system that is applied to this LCD as claimed in claim 1, it is characterized in that: these feed circuit further comprise a phase inverter, this phase inverter converts one group of low-voltage DC inversion of this flyback converter output to a High Level AC Voltage, to drive back light.
5. LCD, it comprises a liquid crystal display module, one is used to control Based Intelligent Control plate that this liquid crystal display module image shows and provides the power drives system of power supply for this liquid crystal display module and Based Intelligent Control plate, this power drives system comprises feed circuit, these feed circuit are used for providing required operating voltage to this liquid crystal display module and this Based Intelligent Control plate, it is characterized in that: these feed circuit comprise a flyback converter, it will be directly changed into the low-voltage DC of multichannel output by the High Level AC Voltage of external power source input, and this multichannel low-voltage DC is as each required operating voltage of this liquid crystal display module.
6. LCD as claimed in claim 5 is characterized in that: this flyback converter is the coupled circuit that is made of through connection in series-parallel resistance, inductance and capacity cell, and utilizes coupling inductance to realize the buck-boost type converter of energy conversion purpose.
7. LCD as claimed in claim 5, it is characterized in that: this liquid crystal display module comprises a pel array, an one source pole driving circuit and a gate driver circuit, this source electrode drive circuit and this gate driver circuit are used for driving the image demonstration of this pel array.
8. LCD as claimed in claim 5 is characterized in that: this Based Intelligent Control plate further comprises:
Time schedule controller, it is used for controlling the source electrode drive circuit and the gate driver circuit of this liquid crystal display module, and
One scan convergent-divergent circuit, it is used for accepting processing Low Voltage Differential Signal or transition minimized differential signaling and vision signal.
9. LCD as claimed in claim 5, it is characterized in that: these feed circuit also comprise a bridge joint filtering circuit and a phase inverter, this bridge joint filtering circuit is used for the high voltage direct current from external power source is carried out filtering, so that stable High Level AC Voltage to be provided, this phase inverter converts one group of low-voltage DC inversion of this flyback converter output to a High Level AC Voltage, to drive back light.
10. LCD as claimed in claim 5 is characterized in that: this power drives system also comprises a power control circuit, and this power control circuit has buck functionality, and it cooperates these feed circuit to provide required operating voltage for this LCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610060006 CN101042476A (en) | 2006-03-22 | 2006-03-22 | Driving system of LCD and power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610060006 CN101042476A (en) | 2006-03-22 | 2006-03-22 | Driving system of LCD and power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101042476A true CN101042476A (en) | 2007-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610060006 Pending CN101042476A (en) | 2006-03-22 | 2006-03-22 | Driving system of LCD and power supply |
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| Country | Link |
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| CN (1) | CN101042476A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102214432A (en) * | 2010-12-10 | 2011-10-12 | 友达光电股份有限公司 | Power management and control module and liquid crystal display |
| CN102789773A (en) * | 2012-08-13 | 2012-11-21 | 深圳市华星光电技术有限公司 | Control system of liquid crystal display device and liquid crystal display device |
| CN101409500B (en) * | 2007-10-10 | 2013-03-20 | 三星显示有限公司 | Inverter and liquid crystal display device including the same |
| CN102983744A (en) * | 2012-12-25 | 2013-03-20 | 深圳市华星光电技术有限公司 | DC/DC module for LCD driving circuit |
| WO2014026350A1 (en) * | 2012-08-13 | 2014-02-20 | 深圳市华星光电技术有限公司 | Control system of liquid crystal display device and liquid crystal display device |
| US8994219B2 (en) | 2012-12-25 | 2015-03-31 | Shenzhen China Star Optoelectronics Technology Co., Ltd | DC/DC module of LCD driving circuit |
| CN105487532A (en) * | 2016-02-19 | 2016-04-13 | 上海果路交通科技有限公司 | Vehicle-mounted diagnostic data sharing terminal system |
| US9324291B2 (en) | 2012-08-13 | 2016-04-26 | Yinhung Chen | LCD device control system and LCD device |
| CN105723445A (en) * | 2013-11-12 | 2016-06-29 | 富士胶片株式会社 | Display device and control method for same |
| CN106448577A (en) * | 2016-11-29 | 2017-02-22 | 深圳创维－Rgb电子有限公司 | Backlight constant-current drive plate and liquid crystal display television |
-
2006
- 2006-03-22 CN CN 200610060006 patent/CN101042476A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101409500B (en) * | 2007-10-10 | 2013-03-20 | 三星显示有限公司 | Inverter and liquid crystal display device including the same |
| CN102214432A (en) * | 2010-12-10 | 2011-10-12 | 友达光电股份有限公司 | Power management and control module and liquid crystal display |
| TWI404310B (en) * | 2010-12-10 | 2013-08-01 | Au Optronics Corp | Power management and control module and liquid crystal display device |
| CN102789773B (en) * | 2012-08-13 | 2015-09-09 | 深圳市华星光电技术有限公司 | A kind of control system of liquid crystal indicator and liquid crystal indicator |
| CN102789773A (en) * | 2012-08-13 | 2012-11-21 | 深圳市华星光电技术有限公司 | Control system of liquid crystal display device and liquid crystal display device |
| WO2014026411A1 (en) * | 2012-08-13 | 2014-02-20 | 深圳市华星光电技术有限公司 | Control system of liquid crystal display device and liquid crystal display device |
| WO2014026350A1 (en) * | 2012-08-13 | 2014-02-20 | 深圳市华星光电技术有限公司 | Control system of liquid crystal display device and liquid crystal display device |
| US9324291B2 (en) | 2012-08-13 | 2016-04-26 | Yinhung Chen | LCD device control system and LCD device |
| CN102983744A (en) * | 2012-12-25 | 2013-03-20 | 深圳市华星光电技术有限公司 | DC/DC module for LCD driving circuit |
| US8994219B2 (en) | 2012-12-25 | 2015-03-31 | Shenzhen China Star Optoelectronics Technology Co., Ltd | DC/DC module of LCD driving circuit |
| CN105723445A (en) * | 2013-11-12 | 2016-06-29 | 富士胶片株式会社 | Display device and control method for same |
| CN105487532A (en) * | 2016-02-19 | 2016-04-13 | 上海果路交通科技有限公司 | Vehicle-mounted diagnostic data sharing terminal system |
| CN106448577A (en) * | 2016-11-29 | 2017-02-22 | 深圳创维－Rgb电子有限公司 | Backlight constant-current drive plate and liquid crystal display television |
| CN106448577B (en) * | 2016-11-29 | 2019-02-26 | 深圳创维－Rgb电子有限公司 | A kind of backlight constant current driving plate and liquid crystal TV set |
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Open date: 20070926 |