CN100479225C - Light emission device and power supply therefor - Google Patents

Light emission device and power supply therefor Download PDF

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Publication number
CN100479225C
CN100479225C CNB2005100738257A CN200510073825A CN100479225C CN 100479225 C CN100479225 C CN 100479225C CN B2005100738257 A CNB2005100738257 A CN B2005100738257A CN 200510073825 A CN200510073825 A CN 200510073825A CN 100479225 C CN100479225 C CN 100479225C
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reference voltage
voltage
power
external
overregulating
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CN1703120A (en
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朴星千
李京洙
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Samsung Display Co Ltd
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Samsung Mobile Display Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/02—Ventilation; Air-conditioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J3/00—Driving of auxiliaries
    • B63J3/02—Driving of auxiliaries from propulsion power plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/065—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit fan combined with single duct; mounting arrangements of a fan in a duct
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport

Abstract

A power supply device supplying power to a data driver of a light emission display device. The power supply device includes: an external reference voltage supply supplying an external reference voltage; a reference voltage generator converting external power into a regulated direct current (DC) reference voltage and outputs the regulated DC reference voltage when the external power is changed. A reference voltage selector selects one of the reference voltages output from the external reference voltage supply and the reference voltage generator and outputs a selected reference voltage. A voltage converter converts the regulated reference voltage output from the reference voltage selector into a plurality of internal DC power sources to be supplied to the drivers.

Description

Light emitting devices and power supply thereof
Technical field
The present invention relates to a kind of power-supply device that is used for light emitting display device, specifically, the present invention relates to a kind of power-supply device that comprises stabilizing circuit, provide data voltage with integrated circuit stably to the data driver of light emitting display device with normal voltage.
Background technology
Generally speaking, organic field luminescence (below be called " EL ") display unit classifies as the pixel of arranging according to matrix format with the phosphorus organic principle, and comes visual image by control flows to the magnitude of current of this phosphorus organic principle.This organic EL display is a kind of advanced display, and its high response, low-power consumption also have bigger visual angle.Therefore estimate that OLED display can become display of future generation.
Fig. 1 illustrates the optical sender system (the following OLED that alternatively is called) of OLED display.
Generally speaking, OLED device electrostimulation phosphorus organic principle, and by M * N organic Optical Transmit Unit being carried out voltage-programming or current programmedly coming visual image.As shown in Figure 1, these organic Optical Transmit Units comprise indium tin oxide (ITO) pixel electrode, organic film and metal level.As shown in Figure 1, organic film has sandwich construction, comprises emission layer (EML), electron transfer layer (ELT) and hole transmission layer (HTL), thereby the light emission effciency is also improved in balance electronic and hole thus.In addition, organic film also comprises electron injecting layer (EIL) and hole injection layer (HIL) dividually.
The method that driving has organic Optical Transmit Unit of above-mentioned configuration comprises passive-matrix method and active-matrix method.The active-matrix method adopts thin-film transistor (TFT).In the passive-matrix method, the formation intersected with each other of anode and negative electrode, and select a line to drive organic Optical Transmit Unit.But in the active-matrix method, each indium tin oxide (ITO) pixel electrode all is coupled with TFT, and drives Optical Transmit Unit according to the voltage that capacitance kept by the capacitor that is coupled to the TFT grid.
Fig. 2 illustrates the image element circuit of typical OLED.This image element circuit comprises OLED, driving transistors DM, switching transistor SM and capacitor Cst.Driving transistors DM and switching transistor SM can be provided as the PMOS transistor.
The source electrode of driving transistors DM and power vd D coupling, capacitor Cst is coupling between the grid and source electrode of driving transistors DM.Capacitor Cst makes the grid-source voltage on the driving transistors keep one period scheduled time, and switching transistor SM sends to driving transistors DM with data voltage from data wire Dm in response to the selection signal from current scanning line Sn.
The negative electrode of OELD and reference voltage Vss coupling, OLED launches corresponding to the light that is applied to the electric current on this OLED by driving transistors DM.At this, with the cathode coupled reference voltage Vss of OLED less than supply voltage VDD, therefore can apply earthed voltage to it.
DC-DC (DC/DC) transducer that provides in the integrated circuit (IC) of the data voltage of OLED display by the data driver that adopts external power source (adopting electric charge to extract (charge-pump) method usually) produces.This data voltage influences the brightness and contrast of display floater.But data voltage may rise or descend when external power source descends suddenly or noise occurs, and the instability of data voltage can influence the brightness and contrast of panel.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is for no matter light emitting display device provides a kind of reference voltage through overregulating the variation of external power source, and provides voltage through overregulating to the data driver of light emitting display device.
In addition, the invention provides a kind of light emitting display device with reference voltage regulating circuit, this reference voltage regulating circuit can be selectively provides the reference voltage through overregulating to data driver IC and does not consider the variation of external power source.
In one aspect of the invention, provide the power-supply device of energy to comprise to light emitting display device: reference voltage regulator and electric pressure converter.Reference voltage regulator is converted to direct current (DC) reference voltage through overregulating with external voltage, and exports this DC reference voltage through overregulating.Electric pressure converter will be converted to a plurality of internal DC power sources that are respectively applied for the driver of described power-supply device from the reference voltage through overregulating of reference voltage regulator output.
Described power-supply device also comprises controller.This controller allows directly to use the reference voltage through overregulating, or distributes the reference voltage through overregulating, to be converted to a plurality of internal DC power sources that are used for driver respectively.
Reference voltage regulator can use operational amplifier (OP-AMP) to regulate external voltage.OP-AMP controls the reference voltage of this OP-AMP, and to export fixing output voltage, the reference voltage of OP-AMP is determined the data ON/OFF voltage level of input data driver.
Reference voltage regulator can use low pressure drop (low drop out) (LDO) voltage regulator regulate external voltage.The LDO voltage regulator will be compared by voltage and the external voltage that the resistor that is coupling in the LDO voltage regulator distributes, with the fixing output voltage of terminal output to the LDO voltage regulator.
In another aspect of this invention, light emitting display device comprises: a plurality of data wires; A plurality of scan lines; A plurality of image element circuits; Scanner driver; Data driver; Panel controller; Power supply; And display floater.Described a plurality of data wire transmits the data voltage corresponding to picture signal.Described a plurality of scan line transmits selects signal.Described a plurality of image element circuit is coupled to scan line and data wire.The described driver that scans optionally will select signal to be applied on n the scan line.Data driver will be applied to corresponding to the data voltage of picture signal on the m data wire.Panel controller control red, green, blue chrominance signal (rgb signal), clock signal and vertical/horizontal signal, and order these signals are applied to scanner driver and data driver.Power supply provides energy to scanner driver, data driver and panel controller, external voltage is converted to direct current (CD) reference voltage through overregulating, this DC reference voltage through overregulating is converted to a plurality of internal DC power sources that are used for data driver, and exports a plurality of internal DC power sources of this process conversion.The power that display floater uses the signal that provided by scanner driver and data driver and power supply to provide drives n * m Optical Transmit Unit, with display image thereon.
In another aspect of this invention, power-supply device comprises: the external reference voltage source; Reference voltage generator; Reference voltage selector; And electric pressure converter.Described power-supply device provides energy to the data driver of light emitting display device.Described external reference voltage source provides external reference voltage.When external voltage changed, reference voltage generator was converted to external voltage direct current (DC) reference voltage through overregulating and exports this DC reference voltage through overregulating.Described reference voltage selector is selected from one of reference voltage of external reference voltage source and reference voltage generator output, and exports selected reference voltage.Electric pressure converter will be converted to a plurality of internal DC power sources that will offer driver from the reference voltage through overregulating of reference voltage selector output.
Described power-supply device also comprises controller, and it allows directly to use from the reference voltage through overregulating of reference voltage selector output, or distributes the reference voltage through overregulating, it is converted to a plurality of internal electric sources that will offer driver respectively.
Described power-supply device also comprises the external voltage determiner of determining that external voltage changes.
Described reference voltage generator uses operational amplifier (OP-AMP) to regulate external voltage.OP-AMP controls the reference voltage of this OP-AMP, determines the data ON/OFF voltage level of input data driver, with the output voltage of output through overregulating.
Described reference voltage generator use low pressure drop (low drop out) (LDO) voltage regulator is regulated external voltage.Voltage and this external voltage that the LDO voltage regulator will be coupled to the resistor distribution of LDO voltage regulator output internally compare, to export fixing output voltage.
In another aspect of this invention, light emitting display device comprises: a plurality of data wires; A plurality of scan lines; A plurality of image element circuits; Scanner driver; Data driver; Panel controller; Power supply; And display floater.Described a plurality of data wire transmits the data voltage corresponding to picture signal.Described a plurality of scan line transmits selects signal.Described a plurality of image element circuit is coupled to scan line and data wire.The described driver that scans optionally will select signal to be applied on n the scan line.Data driver will be applied to corresponding to the data voltage of picture signal on the m data wire.Panel controller control red, green, blue chrominance signal (rgb signal), clock signal and vertical/horizontal synchronizing signal, and order these signals are applied to scanner driver and data driver.Described power supply receives external reference voltage, external voltage is converted to direct current (DC) reference voltage through overregulating, select one of external reference voltage or DC reference voltage through overregulating, selected reference voltage is converted to a plurality of internal DC power sources that are used for data driver, and exports a plurality of internal DC power sources of this process conversion.The power that display floater uses the signal that provided by scanner driver and data driver and power supply to provide drives n * m Optical Transmit Unit, with display image thereon.
Description of drawings
Fig. 1 is the schematic diagram of the optical sender system of organic EL.
Fig. 2 illustrates the image element circuit of typical organic EL.
Fig. 3 illustrates the organic EL display panel that adopts the active-matrix method of utilizing thin-film transistor according to the embodiment of the invention.
Fig. 4 is the schematic block diagram according to the organic EL display of the embodiment of the invention.
Fig. 5 is the schematic block diagram according to the reference voltage regulating circuit of the power-supply device that is used for light emitting devices of first embodiment of the invention.
Fig. 6 illustrate light emitting devices, according to some reference voltages of voltage level classification.
Fig. 7 illustrates the power-supply device that has according to the reference voltage regulating circuit that is used for light emitting devices of first embodiment of the invention.
Fig. 8 A and Fig. 8 B illustrate the reference voltage regulating circuit of the power-supply device that is used for light emitting devices, and this reference voltage regulating circuit is implemented by low pressure drop (LDO) voltage regulator that adopts the specific embodiment according to the present invention.
Fig. 9 is a schematic block diagram of selecting circuit according to the reference voltage of the power supply that is used for light emitting devices of second embodiment of the invention.
Figure 10 illustrates the power-supply device that has according to the reference voltage regulating circuit that is used for light emitting devices of second embodiment of the invention.
Embodiment
With reference now to Fig. 3,, comprises OLED display floater 600, data driver 400 and scanner driver 500 according to the OLED of the embodiment of the invention.
OLED display floater 600 comprises the data wire D1 to Dm that lines up row, the scan line S1 to Sn that aligns and n * m image element circuit.Data wire D1 to Dm is sent to image element circuit with data-signal as picture signal, and scan line S1 to Sn will select signal to be sent to image element circuit.At this, image element circuit is formed on the single pixel region 610 by two adjacent data line D1 to Dm and two adjacent scanning lines S1 to Sn definition.
Scanner driver 400 sequentially will select signal to be applied to scan line S1 to Sn, and data driver 500 will be applied to data wire D1 to Dm corresponding to the data voltage of picture signal.
Scanner driver 400 and/or data driver 500 are coupled to OLED display floater 600.Perhaps, scanner driver 400 and/or data driver 500 are configured to integrated circuit (IC) and these IC are installed on the OLED display floater 600.Perhaps, IC be installed in such as banded transmission package (tape carrier package, TCP), the flexibly connecting on the assembly of flexible print circuit (FPC), and these flexibly connect assembly be connected to with the OLED display floater 600 of its coupling on.
On the other hand, scanner driver 400 and data driver 500 can replace with the drive circuit that is formed in the OLED display floater 600, and these drive circuits are to be made of the layer identical with scan line, data wire and transistor.
Fig. 4 schematically shows the block diagram according to the OLED display unit of the embodiment of the invention.The OLED display unit comprises Video Controller 100, panel controller 200, power supply 300, scanner driver 400, data driver 500 and oled panel 600.Scanner driver 400 and data driver 500 provide the signal that is sent to the oled panel of arranging according to column direction and line direction 600 respectively by analog interface and digital interface.
Specifically, comprise that the analog signal of red, green and blue (RGB) signal and synchronizing signal are transfused to Video Controller 100 and are converted into digital signal, panel controller 200 control figure signal sequence ground input scan driver 400 and data drivers 500.Oled panel 600 drives by the power voltage that uses input scan driver 400 and data driver 500 and power supply 300 and provide or current drives n * m organic transmitter unit comes display image.
Fig. 5 illustrates the illustrative configurations according to the reference voltage regulating circuit of the power-supply device that is used for light emitting display device of first embodiment of the invention.This regulating circuit comprises reference voltage regulator 310 and controller 320.
Reference voltage regulator 310 is adjusted to 2.0V with 2.5V to the external voltage in the 3.3V scope, and exports the value after this adjusting.
In detail, the data driver that reference voltage regulator 310 will be input as light emitting display device provides the external voltage Vci of the power-supply device of energy to be converted to direct current (DC) reference voltage VCIR through overregulating and output transformation result.At this, external power source input voltage Vci is imported by battery.
Reference voltage regulator 310 utilizes operational amplifier (OP-AMP) to regulate external voltage, and this OP-AMP controls its voltage, determines the data ON/OFF level of input data driver, with the output voltage of output through overregulating.
In addition, reference voltage regulator 310 can adopt low pressure drop (LDO) voltage regulator to regulate external voltage, and this LDO voltage regulator will be compared by voltage and the external voltage that the resistor that is coupled to LDO voltage regulator output internally distributes, and the output voltage of output through overregulating.In a word, the LDO voltage regulator comprises bipolar junction transistor (BJT) and field-effect transistor (FET).When inciting somebody to action below with reference to figure 8A and Fig. 8 B, more detailed description mentions.
In addition, controller 320 distributes the DC reference voltage through overregulating that will be directly used in or be converted to a plurality of internal DC power sources in the driver.Controller 320 to provide-the DC/DC transducer 330 of the internal power source voltage of 14V in the 14V scope provides the VCIR of the DC reference voltage through overregulating.Controller 320 can be simply distributes reference voltage through overregulating by electric wire, or distributes reference voltage through overregulating according to predetermined instruction to some internal circuits.In addition, controller 320 can integrally provide with DC/DC transducer 330.
In the first embodiment of the present invention, being used for integrated circuit to data driver such as the regulating circuit of OP-AMP or LDO voltage regulator provides data voltage through overregulating, and does not consider the variation of external voltage.Thus, the output voltage of this regulating circuit can be used as reference voltage, and data voltage can utilize the data voltage through overregulating to compensate, and prevents that thus brightness from changing.
Fig. 6 illustrates the some reference voltages according to the power-supply device that is used for light emitting display device of first embodiment of the invention, and these reference voltages are classified by voltage level.
As shown here, external power source 410 has 2.5V to the voltage Vci between the 3.3V.Vci voltage is imported by battery.In other words, Vci voltage is converted to the VCIR voltage of 2.0V by the regulating circuit according to the embodiment of the invention, and the VCIR voltage of this 2.0V becomes reference voltage, and external power source 410 provides energy to each internal circuit of light emitting display device thus.As shown in Figure 6, the output voltage 430 of DC/DC transducer according to described purpose from-14V to 14V.
Fig. 7 illustrates the power-supply device reference voltage regulating circuit, that be used for light emitting display device that has according to first embodiment of the invention.This be used for light emitting display device, have power-supply device according to the reference voltage regulating circuit of first embodiment of the invention comprise voltage regulator circuit 301 with reference voltage regulator 310 and control circuit 320, as the first and second boost pressure circuit 330a, the 330b of DC/DC transducer.When needing, power-supply device 300 comprises that also output amplifier 340 amplifies output voltage V dOUT.
At this, because identical among reference voltage regulator 310 and control circuit 320 and Fig. 5 omitted its detailed description at this.
External voltage Vci is by the external voltage of battery input, is set to predetermined voltage by Zener diode respectively.But between the 3.3V, so the quality of this external voltage decreases owing to noise or electric current leak the scope of this predetermined voltage at 2.5V.For preventing this point, provide the reference voltage regulating circuit to export to have the reference voltage of the voltage after the adjusting.
In addition, the first and second boost pressure circuit 330a, 330b output area are converted to as shown in Figure 6 internal electric source at-14V to a plurality of builtin voltages between the 14V.
Fig. 8 A and Fig. 8 B illustrate the reference voltage regulating circuit that is embodied as according in the power-supply device LDO voltage regulator, light emitting display device of first embodiment of the invention.
Fig. 8 A schematically shows the reference voltage regulating circuit with general LDO voltage regulator 310 '.LDO voltage regulator 310 ' will be compared by voltage and the external voltage that the resistor that is coupled to adjuster 310 ' output internally distributes, and the output voltage of output through overregulating.At this, Cin represents input capacitor, C LRepresent output capacitor.
Fig. 8 B illustrates the internal configurations of LDO voltage regulator 310 ', comprising: ON/OFF controller 311; Error amplifier 312; Flow restricter 313; Reference voltage generator 314; Direct resistance R 1 and R2; And PMOS transistor Q1.Utilize this configuration, the 310 ' output of LDO voltage regulator is owing to the voltage of resistance R 1 that is coupled to adjuster 310 outputs internally and R2 distribution and the adjusting output voltage that external voltage relatively produces.At this, Vin represents input signal, and Vout represents output signal, and Vss represents ground voltage.In addition, the CE representative is used for the open/close enabling signal of control output voltage.The configuration that those skilled in the art understands LDO voltage 310 ' is not limited only to the above-mentioned configuration shown in Fig. 8 B.The configuration of LDO voltage regulator can change.
Fig. 9 schematically shows the configuration of selecting circuit according to the reference voltage of the light emitting display device of second embodiment of the invention.Select circuit to comprise according to the reference voltage of second embodiment of the invention: external reference voltage source 730; Reference voltage generator 710; Reference voltage selector 720; External voltage determiner 740; And controller 750.
External reference voltage source 730 provides external reference voltage VICRex to reference voltage selector 720.
Reference voltage generator 710 is converted to DC reference voltage through overregulating with external voltage, and output result when the change in voltage of external power source and when therefore making this external voltage provide unstablely.
Reference voltage generator 710 is adjusted to 2.0V with 2.5V to the external voltage in the 3.3V scope, and exports this voltage through overregulating.
More particularly, the data driver that reference voltage generator 710 will be input as light emitting display device from the outside provides the external voltage Vci of the power-supply device of energy to be converted to DC reference voltage VCIR through overregulating, and exports this DC reference voltage VCIR through overregulating.At this, external voltage Vci is the external voltage from the battery input.
At this, reference voltage generator 710 adopts OP-AMP to regulate external voltage, and OP-AMP controls the voltage that it determines the data ON/OFF level of input data driver, and the output voltage of output through overregulating.
In addition, reference voltage generator 710 adopts the LDO voltage regulator to regulate reference voltage, voltage and external voltage that the LDO voltage regulator will be coupled to the resistor distribution of LDO voltage regulator output internally compare, and the output voltage of output through overregulating.Usually, the LDO voltage regulator comprises bipolar junction transistor (BJT) and field-effect transistor (FET).
Reference voltage selector 720 is selected one of reference voltage of input external reference voltage source 730 or reference voltage generator 710, and exports selected reference voltage VCIR '.
External voltage determiner 740 is determined the change in voltage of external power source.For example, when external reference voltage determines that the address of signal VCIR_EX is 0, external voltage determiner 740 activates internal reference voltage and produces pattern, so that examine voltage VCIR from what external power source Vci produced stable ginseng, and external voltage determiner 740 control external voltages, used as reference voltage VCIR and as exporting with reference to voltage VCIR ', this is to be selected by reference voltage selector 720 when external reference voltage determines that the address of signal VCIR_EX is 1.
In addition, the reference voltage through overregulating is directly used in controller 750 permissions, or distributes the reference voltage through overregulating, so that be used as a plurality of internal electric sources by the conversion in the driver.At this, controller 750 to provide-14V provides the VCIR ' of the reference voltage through overregulating to the DC/DC transducer 760 of a plurality of internal electric sources between the 14V.Controller 750 can distribute reference voltage through overregulating by electric wire, or distributes reference voltage through overregulating according to predetermined instruction by some internal circuits.In addition, controller 750 can integrally provide with DC/DC transducer 760.
According to embodiments of the invention, being used for integrated circuit to data driver such as the regulating circuit of OP-AMP or LDO voltage regulator provides data voltage through overregulating, and does not consider the variation of external voltage.Thus, the output voltage of regulating circuit can be used as reference voltage, and data voltage can utilize the data voltage through overregulating to compensate, and has prevented the brightness variation thus.
Figure 10 illustrates the reference voltage that has according to second embodiment of the invention and selects power-supply device circuit, that be used for light emitting devices.
As shown here, have according to the reference voltage of second embodiment of the invention and select power-supply device 700 circuit, that be used for light emitting devices to comprise: voltage regulator circuit 701; Reference voltage generator 710; Reference voltage selector 720; Controller 750; And as DC/DC transducer first and second boost pressure circuit 760a and the 760b.Power-supply device 700 also can comprise the output amplifier 770 that is used to amplify output voltage V dOUT when needing in addition.
As shown in figure 10, reference voltage generator 710 is converted to DC reference voltage through overregulating with external voltage, selection is from one of reference voltage of external reference voltage source and reference voltage generator 710 outputs, and exports selected reference voltage VICR ' when the external voltage Vci of input changes.At this, therefore reference voltage generator 710, reference voltage selector 720 and controller 750 omit its detailed description with shown in Figure 9 identical.
External voltage Vci is the external voltage from the battery input, and is set to predetermined voltage respectively by Zener diode.But, the scope of this predetermined voltage as described at 2.5V between the 3.3V, so the quality of external voltage may since the leakage of noise or electric current decrease.Therefore, recommend to adopt the reference voltage regulating circuit to export reference voltage with regulation voltage.
In addition, the first and second boost pressure circuit 760a, 760b output area-14V is to a plurality of builtin voltages between the 14V, these builtin voltages are converted to internal electric source as shown in Figure 6 respectively.
According to the first and second aspects of the present invention, provide voltage, prevent thus owing to data voltage changes the non-consistent brightness that causes through overregulating to the data driver of light emitting devices.
Therefore, the present invention to light emitting display device provide through overregulating reference voltage and no matter the variation of external voltage, and provide voltage through overregulating to the data driver of light emitting display device, prevent thus owing to data voltage changes the non-consistent brightness that causes.
In addition, the present invention selects one of reference voltage through overregulating or the external reference voltage through overregulating to come data driver to light emitting display device that voltage through bigger adjusting is provided, and prevents thus because the non-consistent brightness that the data voltage variation causes.
Though the present invention is described in conjunction with the present practical embodiments of thinking, be to be understood that to the invention is not restricted to the disclosed embodiments, but the various modifications and the equivalence that are intended to cover within the spirit and scope of the present invention are provided with.

Claims (15)

1. one kind provides the power-supply device of energy to light emitting display device, and this power-supply device comprises:
Reference voltage regulator is used for external voltage is converted to DC reference voltage through overregulating, and exports this DC reference voltage through overregulating;
Electric pressure converter is used for the DC reference voltage through overregulating from reference voltage regulator output is converted to a plurality of inside DC power supply that offer the driver of described power-supply device respectively.
2. power-supply device according to claim 1 also comprises controller, and it allows directly to use the DC reference voltage through overregulating, or distributes the DC reference voltage through overregulating, to be converted to a plurality of inside DC power supply that are used for described driver respectively.
3. power-supply device according to claim 1, wherein, described reference voltage regulator uses operational amplifier to regulate described external voltage.
4. power-supply device according to claim 3, wherein, described operational amplifier is controlled the reference voltage of this operational amplifier, and to export fixing output voltage, the reference voltage of described operational amplifier is determined the data ON/OFF voltage level of input data driver.
5. power-supply device according to claim 1, wherein, described reference voltage regulator uses low drop out voltage regurator to regulate described external voltage.
6. power-supply device according to claim 5, wherein, described low drop out voltage regurator will be compared by voltage and the described external voltage that the resistor that is coupling in this low drop out voltage regurator distributes, with the fixing output voltage of terminal output to this low drop out voltage regurator.
7. light emitting display device comprises:
Transmission is corresponding to a plurality of data wires of the data voltage of picture signal;
Transmit a plurality of scan lines of selecting signal;
Be coupled to a plurality of image element circuits of described scan line and data wire;
Optionally will select signal to be applied to scanner driver on n the scan line in a plurality of scan lines;
To be applied to the data driver on m the data wire in a plurality of data wires corresponding to the data voltage of picture signal;
Panel controller, control red, green, blue chrominance signal, clock signal and vertical/horizontal synchronizing signal, and sequentially these signals are applied to described scanner driver and data driver;
Power supply, provide energy to described scanner driver, data driver and panel controller, external voltage is converted to DC reference voltage through overregulating, this DC reference voltage through overregulating is converted to a plurality of inside DC power supply that are used for described data driver, and exports a plurality of internal DC power sources of this process conversion; With
Display floater the signal that provided by described scanner driver and data driver is provided and drives n * m Optical Transmit Unit by the power that power supply provides, with display image on described display floater.
8. the data driver to light emitting display device provides the power-supply device of energy, and this power-supply device comprises:
The external reference voltage source of external reference voltage is provided;
Reference voltage generator is converted to DC reference voltage through overregulating with external voltage, and externally exports this DC reference voltage through overregulating during change in voltage;
Reference voltage selector is selected from one of reference voltage of external reference voltage source and reference voltage generator output, and is exported selected reference voltage;
Electric pressure converter will be converted to a plurality of inside DC power supply that offer data driver from the DC reference voltage through overregulating of reference voltage selector output.
9. power-supply device according to claim 8, also comprise controller, it allows directly to use the DC reference voltage through overregulating from described reference voltage selector output, or the DC reference voltage of distribution through overregulating, it is converted to a plurality of inside DC power supply of using by described data driver respectively.
10. power-supply device according to claim 8 also comprises the external voltage determiner of determining that external voltage changes.
11. power-supply device according to claim 8, wherein, described reference voltage generator uses operational amplifier to regulate external voltage.
12. power-supply device according to claim 11, described operational amplifier is controlled the reference voltage of this operational amplifier, determines the data ON/OFF voltage level of the described data driver of input, with the output voltage of output through overregulating.
13. power-supply device according to claim 8, wherein, described reference voltage generator uses low drop out voltage regurator to regulate described external voltage.
14. power-supply device according to claim 13, wherein, described low drop out voltage regurator will be compared by voltage and this external voltage that the resistor that is coupling in this low drop out voltage regurator distributes, with the fixing output voltage of terminal output to this low drop out voltage regurator.
15. a light emitting display device comprises:
Transmission is corresponding to a plurality of data wires of the data voltage of picture signal;
Transmit a plurality of scan lines of selecting signal;
Be coupled to a plurality of image element circuits of described scan line and data wire;
Optionally will select signal to be applied to scanner driver on n the scan line in a plurality of scan lines;
To be applied to the data driver on m the data wire in a plurality of data wires corresponding to the data voltage of picture signal;
Panel controller, control red, green, blue chrominance signal, clock signal and vertical/horizontal synchronizing signal, and order these signals are applied to scanner driver and data driver;
Power supply, receive external reference voltage, external voltage is converted to DC reference voltage through overregulating, select one of described external reference voltage or DC reference voltage through overregulating, selected reference voltage is converted to a plurality of inside DC power supply that are used for described data driver, and exports a plurality of inner DC power supply of this process conversion; And
Display floater the signal that provided by described scanner driver and data driver is provided and drives n * m Optical Transmit Unit by the power that power supply provides, with display image on described display floater.
CNB2005100738257A 2004-05-24 2005-05-24 Light emission device and power supply therefor Active CN100479225C (en)

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KR36867/04 2004-05-24
KR1020040036853A KR100578840B1 (en) 2004-05-24 2004-05-24 A power supply in a lighting emitting device
KR36853/04 2004-05-24

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Publication number Priority date Publication date Assignee Title
CN101196755B (en) * 2006-12-06 2011-01-12 北京中电华大电子设计有限责任公司 High-precision voltage regulator
KR100876276B1 (en) 2007-10-29 2008-12-26 삼성모바일디스플레이주식회사 Organic light emitting display
CN102420597B (en) * 2011-11-30 2013-12-25 中国科学院微电子研究所 Voltage selector
US9983604B2 (en) * 2015-10-05 2018-05-29 Samsung Electronics Co., Ltd. Low drop-out regulator and display device including the same
CN108269521A (en) * 2018-01-19 2018-07-10 昆山国显光电有限公司 Compensate the method, apparatus of supply voltage and display equipment in display panel

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