WO2016192426A1 - 一种为有机发光二极管供电的电源电路和显示面板 - Google Patents

一种为有机发光二极管供电的电源电路和显示面板 Download PDF

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Publication number
WO2016192426A1
WO2016192426A1 PCT/CN2016/075788 CN2016075788W WO2016192426A1 WO 2016192426 A1 WO2016192426 A1 WO 2016192426A1 CN 2016075788 W CN2016075788 W CN 2016075788W WO 2016192426 A1 WO2016192426 A1 WO 2016192426A1
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Prior art keywords
circuit
output
current
voltage
oled panel
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Ceased
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PCT/CN2016/075788
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English (en)
French (fr)
Inventor
张博雅
张成庚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Ordos Yuansheng Optoelectronics Co Ltd
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BOE Technology Group Co Ltd
Ordos Yuansheng Optoelectronics Co Ltd
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Priority to US15/511,204 priority Critical patent/US9886896B2/en
Publication of WO2016192426A1 publication Critical patent/WO2016192426A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Measuring current only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/60—Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • 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
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a power supply circuit and a display panel for powering an organic light emitting diode.
  • the efficiency of a DC-DC conversion circuit for powering an OLED panel is the ratio of output power to input power, and the power consumption of the OLED panel is The product of the output voltage of the DC-DC converter circuit and the output current.
  • a DC-DC conversion circuit for powering an OLED panel generally outputs two power supply signals, wherein a boost circuit in the DC-DC conversion circuit outputs a first power supply signal VDD, and a buck in a DC-DC conversion circuit.
  • the Buck-Boost circuit outputs a second power signal VSS, the voltage of the first power signal VDD may be positive, and the voltage of the second power signal VSS may be negative.
  • the OLED panel can be provided with a voltage difference between the first power signal VDD and the second power signal VSS, so that the OLED panel can be driven by a driver IC (Driver IC), and when the OLED panel is working normally, the DC-DC converter circuit
  • the output voltage that is, the voltage difference between the first power supply signal VDD and the second power supply signal VSS is a constant value.
  • the current output by the DC-DC converter circuit varies within the range [B, C] (B is less than C) and will vary with load; when DC-DC conversion When the load of the circuit is small, the current output from the DC-DC converter circuit is reduced. When the load of the DC-DC converter circuit is large, the current output from the DC-DC converter circuit is increased. It can be understood that the DC-DC conversion circuit can also output the current B when the voltage output from the DC-DC conversion circuit is lower than A.
  • the required current of the OLED panel is small, and the current output by the DC-DC conversion circuit can be, for example, B, and the current B required at this time can correspond to a DC smaller than the A value.
  • the output voltage of the DC circuit therefore, in this case, if the voltage difference outputted by the DC-DC converter circuit is A, letting the DC-DC converter circuit output current B actually causes the DC-DC converter circuit to be excessive. The power is consumed, thereby increasing the power consumption of the DC-DC conversion circuit and reducing the efficiency of the DC-DC conversion circuit.
  • the voltage outputted by the DC-DC converter circuit can be a constant value, and the current output from the DC-DC converter circuit to the OLED panel changes with the load, which causes the DC-DC.
  • the current output from the conversion circuit to the OLED panel is small, the power consumption of the DC-DC conversion circuit is increased, and the efficiency is lowered.
  • Embodiments of the present invention provide a power supply circuit and a display panel for powering an OLED panel, which are used to alleviate or solve the current current outputted by the DC-DC conversion circuit to the OLED panel because the voltage outputted by the DC-DC conversion circuit is a constant value.
  • the current output to the OLED panel of the DC-DC converter circuit is small due to load variation, the power consumption of the DC-DC converter circuit is large and the efficiency is lowered.
  • a power supply circuit for powering an OLED panel includes a DC-DC conversion circuit, a current sensor, a current controller, and a soft start circuit; and the current sensor is configured to detect the DC in real time.
  • a DC conversion circuit outputs a current to the OLED panel;
  • the current controller is configured to generate a control signal according to a current detected by the current sensor in real time and output the signal to the soft start circuit;
  • a preset pulse signal is output to the DC-DC conversion circuit during a preset duration; and between the time periods when the preset pulse signals are outputted two times, according to the received control signal
  • the DC-DC conversion circuit outputs the adjusted pulse signal;
  • the DC-DC conversion circuit is configured to output a preset voltage when receiving the preset pulse signal; and output the adjusted pulse signal when receiving a reduced voltage; a maximum value of the current that the DC-DC conversion circuit can output when outputting the reduced voltage is not less than a target current, and the target current is the DC-DC conversion circuit in the latest one
  • the current output to the OLED panel at a time before the k preset durations before the time when the preset pulse signal is received, k is a natural number.
  • Another embodiment of the present invention provides a display panel, which may include a power supply circuit for powering an OLED panel according to an embodiment of the present invention.
  • the current controller can generate a control signal according to the current output from the DC-DC conversion circuit detected by the current sensor to the OLED panel and output the signal to the OLED panel.
  • a soft start circuit the soft start circuit outputs a preset pulse signal to the DC-DC conversion circuit during a preset duration; and between the time when the preset pulse signal is outputted two times, according to the received control
  • the system signal outputs the adjusted pulse signal to the DC-DC conversion circuit; the DC-DC conversion circuit outputs a preset voltage when receiving the preset pulse signal; and when the adjusted pulse signal is received, the output is reduced.
  • the DC-DC conversion circuit can reduce the output voltage and output the target current, thereby reducing to the OLED panel.
  • the power consumption of the power supply circuit increases the efficiency of the power supply circuit that powers the OLED panel.
  • FIG. 1 is a schematic structural diagram of a power supply circuit for supplying power to an OLED panel according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a power supply circuit for supplying power to an OLED panel according to another embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a power supply circuit for supplying power to an OLED panel according to another embodiment of the present invention.
  • FIG. 4 schematically depicts changes in the output voltage of a DC-DC conversion circuit in a power supply circuit that supplies power to an OLED panel, in accordance with an embodiment of the present invention.
  • FIG. 5 schematically depicts an output characteristic curve of a thin film transistor in a pixel circuit within an OLED panel.
  • a power supply circuit for powering an OLED panel includes a DC-DC conversion circuit, a current sensor, a current controller, and a soft start circuit.
  • the current sensor is configured to detect a current outputted by the DC-DC conversion circuit to the OLED panel in real time;
  • the current controller is configured to generate a control signal according to a current detected by the current sensor and output the current Giving the soft start circuit;
  • the soft start circuit can output a preset pulse signal to the DC-DC conversion circuit during a preset duration, and output presets in two adjacent outputs Between the times of the pulse signals, the adjusted pulse signal is output to the DC-DC conversion circuit according to the received control signal;
  • the DC-DC conversion circuit is configured to output when a preset pulse signal is received a preset voltage; and outputting a reduced voltage when receiving the adjusted pulse signal; and a maximum value of the current that the DC-DC conversion circuit can output when outputting the reduced voltage is not less than a target current,
  • the target current may be a current output to the OLED
  • the preset duration may be the length of time required for the OLED panel to display one frame, that is, the time period corresponding to one frame.
  • the target current may be the current used to drive the brightest pixel on the OLED panel of the OLED within one frame time. By selecting such a target current, the pixel with the highest brightness on the display panel within the preset duration (for example, one frame time) can be driven, thereby facilitating the display level of the OLED panel screen. It can be understood that since the brightest pixels of different pictures may have different brightness, the target currents corresponding to different frames may also be different.
  • the preset duration is represented by ⁇ t
  • the two ⁇ t shown in FIG. 4 are respectively located between time t2 and time t3, and time t4 and time t5, and each ⁇ t can represent OLED.
  • the DC-DC conversion circuit receives the preset pulse signal and outputs a preset voltage V1, between the two adjacent output preset voltages V1, ⁇ t, the DC-DC conversion circuit
  • the adjusted pulse signal is received and the reduced voltage V3 is output.
  • the time during which the output reduced voltage V3 is sustained may be more than one frame time.
  • the target currents corresponding to different frames may be different, and the corresponding reduced output voltages may also be different, that is, the output of the DC-DC converter in different time periods.
  • the reduced voltage can correspond to a particular target current. As shown in FIG. 4, before the preset time length ⁇ t between times t2 and t3, the reduced output voltage V2 is lower than the preset voltage V1, but may be higher than V3, and the preset between times t4 and t4 After the duration ⁇ t, the reduced output voltage V4 is lower than the preset voltage V1 and also lower than V3.
  • the reduced voltages V2, V3, and V4 described above may be determined according to an output characteristic curve of a thin film transistor for driving the OLED in a pixel circuit of the OLED panel.
  • the output characteristic curve of the thin film transistor is as shown in FIG. 5.
  • the voltage corresponding to the critical point between the amplification region and the saturation region of the output characteristic curve of the thin film transistor (for example, the point P shown in FIG. 5) is set to the reduced voltages V2, V3, and V4 for the reduction.
  • the power consumption of the OLED panel is advantageous.
  • the DC-DC conversion circuit After receiving the preset pulse signal, the DC-DC conversion circuit reduces the output voltage according to the received pulse signal, and the DC-DC conversion The circuit can output a current not less than the target current when outputting the reduced voltage. Therefore, in the case where the target current is smaller than the maximum value of the current that can be output when the DC-DC conversion circuit outputs the preset voltage, the DC-DC conversion circuit can reduce the output voltage and output the target current, thereby reducing to the OLED panel.
  • the power consumption of the power supply circuit increases the efficiency of the power supply circuit that powers the OLED panel.
  • the DC-DC conversion circuit may include a Boost circuit and a Buck-Boost circuit.
  • the voltage output by the DC-DC conversion circuit may be the voltage of the first power signal VDD output by the Boost circuit and the voltage of the second power signal VSS output by the Buck-Boost circuit. Therefore, to change the voltage outputted by the DC-DC converter circuit, only the voltage of the first power signal VDD outputted by the Boost circuit may be changed, or only the voltage of the second power signal VSS outputted by the Buck-Boost circuit may be changed. It is possible to change both the voltage of the first power supply signal VDD outputted by the Boost circuit and the voltage of the second power supply signal VSS outputted by the Buck-Boost circuit.
  • the voltage output from the DC-DC conversion circuit is changed by changing the voltage of the second power supply signal VSS outputted by the Buck-Boost circuit.
  • the voltage of the second power supply signal VSS outputted by the Buck-Boost circuit can be lowered; when the voltage outputted by the DC-DC conversion circuit needs to be reduced, the Buck-Boost circuit can be raised.
  • the voltage of the output second power signal VSS is as shown in FIG.
  • the current sensor 15 can The current outputted to the OLED panel 10 by the DC-DC conversion circuit is detected in real time, that is, the current in the loop formed by the Boost circuit 11, the Buck-Boost circuit 12 and the OLED panel 10 is detected; the current controller 14 can detect the current in real time according to the current sensor 15.
  • the incoming current generates a control signal and outputs it to the soft start circuit 13; the soft start circuit 13 can output a preset pulse signal to the Buck-Boost circuit 12 during a preset duration; and outputs a preset pulse signal twice adjacently.
  • the adjusted pulse signal is output to the Buck-Boost circuit 12 according to the received control signal; the Buck-Boost circuit 12 can output a voltage value equal to the voltage of the first power signal VDD and the preset when receiving the preset pulse signal.
  • the second power signal VSS of the difference in voltage and when the adjusted pulse signal is received, raises the voltage of its output.
  • the Buck-Boost circuit 12 reduces the voltage of the second power supply signal VSS outputted by the Buck-Boost circuit 12 to the difference between the voltage of the first power supply signal VDD and the preset voltage, and then according to the received adjustment.
  • the subsequent pulse signal raises the voltage of the second power supply signal VSS whose output is from the difference between the voltage of the first power supply signal VDD and the preset voltage.
  • the current detector detects the current outputted by the DC-DC conversion circuit to the OLED panel in real time, the OLED panel is prevented from being constantly adjusted due to the continuous output of the DC-DC conversion circuit due to the continuously changing current being continuously changed.
  • another power supply circuit for powering the OLED panel is provided.
  • the power supply circuit for powering the OLED panel can adjust the DC-DC conversion circuit according to the average current when the OLED panel displays one frame of picture.
  • the preset duration may be the length of time required for the OLED panel to display one frame of the picture; the current controller 14 may display the Nth frame according to the OLED panel 10 detected by the current sensor 15 in real time.
  • the current at the time determines the average current when the OLED panel 10 displays the Nth frame picture; and generates a control signal according to the average current when the OLED panel displays the Nth frame picture and outputs the control signal to the soft start circuit 13; the soft start circuit 13 can be in the OLED
  • the preset pulse signal is output to the DC-DC conversion circuit; and when the OLED panel 10 displays the N+k+1 frame picture, according to the received control signal to the DC-DC
  • the conversion circuit outputs the adjusted pulse signal; in this embodiment, the target current may be an average current when the OLED panel 10 displays the Nth frame picture; the DC-DC conversion circuit displays the N+k+1 frame picture
  • the maximum value of the current that can be output when the adjusted voltage is output is not less than the target current.
  • An average current output by the OLED panel to reduce a voltage output by the DC-DC conversion circuit when the OLED panel displays the N+1th frame picture; and the current that the DC-DC conversion circuit can output when outputting the reduced voltage The maximum value may be greater than an average current output by the DC-DC conversion circuit to the OLED panel when the OLED panel displays the Nth frame picture.
  • the DC-DC conversion circuit may include a Boost circuit and a Buck-Boost circuit.
  • the voltage output by the DC-DC conversion circuit may be a voltage of the first power signal VDD output by the Boost circuit and a voltage of the second power signal VSS output by the Buck-Boost circuit. The difference is therefore; for the case where the output voltage of the DC-DC conversion circuit is adjusted by adjusting the voltage of the second power signal VSS outputted by the Buck-Boost circuit, the power supply circuit for powering the OLED panel provided by this embodiment of the present invention is also Referring to FIG. 1, the soft start circuit 13 can output a preset pulse signal to the Buck-Boost circuit 12 when the OLED panel 10 loads the data signal of each frame; and display the N+k+ on the OLED panel 10.
  • the adjusted pulse signal is output to the Buck-Boost circuit 12 according to the received control signal; the Buck-Boost circuit 12 can output the voltage value equal to the first power signal VDD when receiving the preset pulse signal. And a second power signal VSS having a difference between the voltage and the preset voltage; and when receiving the adjusted pulse signal, raising a voltage of the second power signal VSS output by the Buck-Boost circuit 12.
  • the maximum value of the current that the DC-DC conversion circuit can output when outputting the adjusted voltage may be equal to the target current, that is, It is equal to the average current when the OLED panel 10 displays the Nth frame picture, which can further reduce the power consumption of the power supply circuit for powering the OLED panel, thereby further improving the efficiency of the power supply circuit for powering the OLED panel.
  • a power supply circuit for powering an OLED panel according to another embodiment of the present invention is provided, which further includes a protection circuit 21 that can receive an enable signal EN and a voltage at the enable signal EN is safe.
  • the trigger DC-DC conversion circuit is started.
  • the enable signal EN can be a pulse signal.
  • the protection circuit 21 can also keep the DC-DC conversion circuit in an unactivated state when the voltage of the enable signal EN is greater than the maximum value of the safety range, thereby preventing the power supply circuit that supplies power to the OLED panel from being subjected to a large voltage. Shock.
  • a power supply circuit for powering an OLED panel may further include a current-temperature compensation circuit 31, which can perform current output of the OLED panel provided by the embodiment of the present invention.
  • the compensation is such that the power supply circuit for supplying power to the OLED panel of the embodiment of the present invention can output current when the power supply circuit for powering the OLED panel and the existing DC-DC conversion circuit of the embodiment of the present invention output the same voltage.
  • the maximum value can be equal to the maximum value of the current that can be output by the DC-DC conversion circuit in the prior art.
  • the current output by the DC-DC conversion circuit itself may be temperature sensitive, so the temperature may also be compensated so that the current output from the power supply circuit powered by the OLED panel is not affected by the temperature.
  • the current-temperature compensation circuit 31 can perform temperature compensation for the current output from the power supply circuit that supplies power to the OLED panel every frame.
  • the current sensor, the current controller, the soft start circuit, and the current-temperature compensation circuit in the power supply circuit for powering the OLED panel provided by the embodiments of the present invention may all be integrated in the DC-DC conversion circuit, or may be partially integrated in the DC- In the DC conversion circuit, another part is disposed outside the DC-DC conversion circuit, and may be all disposed outside the DC-DC conversion circuit.
  • a further embodiment of the present invention further provides a display panel comprising a power supply circuit for supplying power to an OLED panel according to an embodiment of the present invention.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or the corresponding changes may be located in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

一种为OLED面板供电的电源电路和显示面板，用以缓解或解决目前的DC-DC变换电路输出的电压为恒定值，而DC-DC变换电路输出给OLED面板的电流会随着负载变化所导致的在DC-DC变换电路输出给OLED面板的电流较小时，DC-DC变换电路的功耗较大、效率会降低的问题。该为OLED面板供电的电源电路根据目标电流来降低电源电路中的DC-DC变换电路输出的电压，并且，DC-DC变换电路在输出降低后的电压时能够输出的电流的最大值不小于目标电流，目标电流为DC-DC变换电路在最近一次接收到预设的脉冲信号的时刻之前的k个预设时长之前的时间输出给所述OLED面板的电流。

Description

一种为有机发光二极管供电的电源电路和显示面板 技术领域
本发明涉及显示技术领域，尤其涉及一种为有机发光二极管供电的电源电路和显示面板。
背景技术
在有机发光二极管(OLED，Organic Light Emitting Diode)面板工作的过程中，为OLED面板供电的直流-直流(DC-DC)变换电路的效率为输出功率与输入功率的比值，OLED面板的功耗为DC-DC变换电路输出电压与输出电流的乘积。
目前，为OLED面板供电的DC-DC变换电路通常输出两个电源信号，其中，DC-DC变换电路中的升压(Boost)电路输出第一电源信号VDD，DC-DC变换电路中的降压-升压(Buck-Boost)电路输出第二电源信号VSS，第一电源信号VDD的电压可以为正，第二电源信号VSS的电压可以为负。OLED面板可以被提供第一电源信号VDD和第二电源信号VSS之间的电压差，使得OLED面板能够在驱动电路(Driver IC)的驱动下工作，当OLED面板正常工作时，DC-DC变换电路输出的电压，即第一电源信号VDD和第二电源信号VSS的电压差为恒定值。
假定DC-DC变换电路输出的电压为A，DC-DC变换电路输出的电流在范围[B，C]内变化(B小于C)，并且会随着负载的变化而变化；当DC-DC变换电路的负载较小时，DC-DC变换电路输出的电流会减小，当DC-DC变换电路的负载较大时，DC-DC变换电路输出的电流会增大。可以理解到的是，在DC-DC变换电路输出的电压低于A时，DC-DC变换电路也能够输出电流B。OLED面板在显示低灰阶画面时，OLED面板的所需电流较小，DC-DC变换电路输出的电流例如可以为B，而此时所需要的电流B可以对应于比A值小的DC-DC电路的输出电压，因此，在这种情况下，如果在DC-DC变换电路输出的电压差为A时让DC-DC变换电路输出电流B实际上会使得DC-DC变换电路将过多的电能消耗掉，从而增大DC-DC变换电路的功耗，降低DC-DC变换电路的效率。
综上所述，在OLED面板正常工作时，DC-DC变换电路输出的电压可以为恒定值，而DC-DC变换电路输出给OLED面板的电流会随着负载变化，这会导致在DC-DC变换电路输出给OLED面板的电流较小时，DC-DC变换电路的功耗会增大，效率会降低。
发明内容
本发明实施例提供了一种为OLED面板供电的电源电路和显示面板，用以缓解或解决目前由于DC-DC变换电路输出的电压为恒定值，而DC-DC变换电路输出给OLED面板的电流会随着负载变化所导致的在DC-DC变换电路输出给OLED面板的电流较小时，DC-DC变换电路的功耗较大、效率会降低的问题。
基于上述问题，本发明实施例提供的为OLED面板供电的电源电路，包括DC-DC变换电路、电流感应器、电流控制器和软启动电路；所述电流感应器，用于实时检测所述DC-DC变换电路输出给所述OLED面板的电流；所述电流控制器，用于根据所述电流感应器实时检测到的电流生成控制信号并输出给所述软启动电路；所述软启动电路，用于在预设时长期间，向所述DC-DC变换电路输出预设的脉冲信号；并在相邻两次输出预设的脉冲信号的时间段之间，根据接收到的控制信号向所述DC-DC变换电路输出调整后的脉冲信号；所述DC-DC变换电路，用于在接收到预设的脉冲信号时，输出预设的电压；并在接收到调整后的脉冲信号时，输出降低的电压；所述DC-DC变换电路在输出降低后的电压时所能够输出的电流的最大值不小于目标电流，所述目标电流是所述DC-DC变换电路在最近一次接收到预设的脉冲信号的时刻之前的k个预设时长之前的时间输出给所述OLED面板的电流，k为自然数。
本发明的另一实施例提供一种显示面板，其可包括本发明实施例提供的为OLED面板供电的电源电路。
对于本发明实施例提供的为OLED面板供电的电源电路和显示面板，由于其中的电流控制器能够根据电流感应器实时检测到的DC-DC变换电路输出给OLED面板的电流生成控制信号并输出给软启动电路；软启动电路在预设时长期间向所述DC-DC变换电路输出预设的脉冲信号；并在相邻两次输出预设的脉冲信号的时间之间，根据接收到的控 制信号向DC-DC变换电路输出调整后的脉冲信号；DC-DC变换电路在接收到预设的脉冲信号时，输出预设的电压；并在接收到调整后的脉冲信号时，输出降低的电压；DC-DC变换电路在输出降低后的电压时所能够输出的电流的最大值不小于目标电流(目标电流是所述DCDC电路在最近一次接收到预设的脉冲信号的时刻之前的k个预设时长之前的时间输出给所述OLED面板的电流)。因此，在目标电流小于DC-DC变换电路输出预设的电压时所能够输出的电流的最大值的情况下，DC-DC变换电路能够降低输出的电压并输出目标电流，从而减小为OLED面板供电的电源电路的功耗，提高为OLED面板供电的电源电路的效率。
附图说明
图1为本发明的一个实施例提供的为OLED面板供电的电源电路的结构示意图；
图2为本发明的另一实施例提供的为OLED面板供电的电源电路的结构示意图；
图3为本发明的又一实施例提供的为OLED面板供电的电源电路的结构示意图；
图4示意性地描绘了本发明实施例所提供的为OLED面板供电的电源电路中的DC-DC变换电路的输出电压的变化。
图5示意性地描绘了OLED面板内的像素电路中的薄膜晶体管的输出特性曲线。
具体实施方式
下面结合说明书附图，对为OLED面板供电的电源电路和显示面板的具体实施例进行说明。
本发明实施例提供的为OLED面板供电的电源电路，包括DC-DC变换电路、电流感应器、电流控制器和软启动电路。所述电流感应器，用于实时检测所述DC-DC变换电路输出给所述OLED面板的电流；所述电流控制器，用于根据所述电流感应器实时检测到的电流生成控制信号并输出给所述软启动电路；所述软启动电路，可在预设时长期间向所述DC-DC变换电路输出预设的脉冲信号，并在相邻两次输出预设 的脉冲信号的时间之间，根据接收到的控制信号向所述DC-DC变换电路输出调整后的脉冲信号；所述DC-DC变换电路，用于在接收到预设的脉冲信号时，输出预设的电压；并在接收到调整后的脉冲信号时，输出降低的电压；所述DC-DC变换电路在输出降低后的电压时所能够输出的电流的最大值不小于目标电流，所述目标电流可以是所述DCDC电路在最近一次接收到预设的脉冲信号的时刻之前的k个预设时长之前的时间输出给所述OLED面板的电流，k为自然数。例如，目标电流可以是一个预设时长内用于驱动有机发光二极管OLED面板上的最亮的像素点的电流。
在本发明的实施例中，所提到的预设时长可以是OLED面板显示一帧画面所需的时长，即对应于一帧的时间段。目标电流可以是一帧时间内用于驱动有机发光二极管OLED面板上的最亮的像素点的电流。通过选取这样的目标电流，可以驱动该预设时长(例如，一帧的时间)内显示面板上的亮度最高的像素，从而有利于OLED面板画面显示水平。可以理解的是，由于不同画面的最亮的像素点可能具有不同的亮度，所以对应不同帧的目标电流也可能是不同的。
下面结合图4，示例性地描述本发明实施例所提供的为OLED面板供电的电源电路中的DC-DC变换电路的输出电压的变化。如图4所示，所述预设时长用Δt来表示，图4中所示的两个Δt分别位于t2时刻和t3时刻之间、以及t4时刻和t5时刻之间，每个Δt可以代表OLED面板显示一帧画面所需的时长。在预设时长Δt期间，DC-DC变换电路接收到预设的脉冲信号而输出预设的电压V1，在两次相邻的输出预设电压V1的时间段Δt之间，DC-DC变换电路接收到调整后的脉冲信号而输出降低的电压V3。输出降低的电压V3所持续的时间(即时间t3-t4)可以是一帧的时间以上。
由于不同帧可能具有不同的亮度变化，所以对应不同帧的目标电流可能是不同的，相应的经降低的输出电压也可能是不同的，也就是说，不同时间段内DC-DC变换器输出的经降低的电压可以对应于特定的目标电流。如图4所示，在时间t2和t3之间的预设时长Δt之前，经降低的输出电压V2比预设的电压V1低，但是可以比V3高，在时间t4和t4之间的预设时长Δt之后，经降低的输出电压V4比预设的电压V1低，同时也低于V3。
在一个实施例中，上述的经降低的电压V2、V3和V4可以根据OLED面板的像素电路中的用于驱动OLED的薄膜晶体管的输出特性曲线来确定。例如，薄膜晶体管的输出特性曲线如图5所示，当薄膜晶体管进入放大区之后，通过该薄膜晶体管的电流随着其源漏极电压U的变化很小，甚至趋于稳定。也就是说，在这种情况下，不论外部的电源电路为OLED面板提供多大的电压，通过OLED的电流变化很小或者甚至基本不变。因此，将薄膜晶体管的输出特性曲线的放大区和饱和区之间的临界点(例如，图5中所示的点P)处对应的电压设定为经降低的电压V2、V3和V4对于降低OLED面板的功耗是有利的。
对于本发明实施例提供的为OLED面板供电的电源电路，DC-DC变换电路在接收到预设的脉冲信号之后，会根据接收到调整后的脉冲信号降低输出的电压，并且，DC-DC变换电路在输出降低后的电压时能够输出不小于目标电流的电流。因此，在目标电流小于DC-DC变换电路输出预设的电压时所能够输出的电流的最大值的情况下，DC-DC变换电路能够降低输出的电压并输出目标电流，从而减小为OLED面板供电的电源电路的功耗，提高为OLED面板供电的电源电路的效率。
DC-DC变换电路可包括Boost电路和Buck-Boost电路，DC-DC变换电路输出的电压可以是Boost电路输出的第一电源信号VDD的电压与Buck-Boost电路输出的第二电源信号VSS的电压之差；因此，要改变DC-DC变换电路输出的电压，可以仅改变Boost电路输出的第一电源信号VDD的电压，也可以仅改变Buck-Boost电路输出的第二电源信号VSS的电压，还可以既改变Boost电路输出的第一电源信号VDD的电压，也改变Buck-Boost电路输出的第二电源信号VSS的电压。
就OLED显示面板的特性而言，仅以改变Buck-Boost电路输出的第二电源信号VSS的电压来改变DC-DC变换电路输出的电压来说明。当DC-DC变换电路输出的电压需要增大时，可以降低Buck-Boost电路输出的第二电源信号VSS的电压；当DC-DC变换电路输出的电压需要减小时，可以升高Buck-Boost电路输出的第二电源信号VSS的电压。对于通过改变Buck-Boost电路输出的第二电源信号VSS的电压来改变DC-DC变换电路输出的电压的情形，本发明实施例提供的为OLED面板供电的电源电路如图1所示。
对于图1所示的为OLED面板供电的电源电路，电流感应器15可 实时检测DC-DC变换电路输出给OLED面板10的电流，也就是检测Boost电路11、Buck-Boost电路12和OLED面板10构成的回路中的电流；电流控制器14可根据电流感应器15实时检测到的电流生成控制信号并输出给软启动电路13；软启动电路13，可以在预设时长期间向Buck-Boost电路12输出预设的脉冲信号；并在相邻两次输出预设的脉冲信号之间根据接收到的控制信号向Buck-Boost电路12输出调整后的脉冲信号；Buck-Boost电路12在接收到预设的脉冲信号时可输出电压值等于第一电源信号VDD的电压与预设的电压之差的第二电源信号VSS；并在接收到调整后的脉冲信号时，升高其输出的电压。
也就是说，Buck-Boost电路12在预设时长期间会将其输出的第二电源信号VSS的电压降低至第一电源信号VDD的电压与预设的电压之差，然后再根据接收到的调整后的脉冲信号，将其输出的第二电源信号VSS的电压从第一电源信号VDD的电压与预设的电压之差升高。
另外，由于电流检测器实时检测DC-DC变换电路输出给OLED面板的电流，为了避免由于实时检测的电流不停地变化导致的DC-DC变换电路输出的电压不停的调整而造成的OLED面板显示异常，本发明的另外的实施例还提供了另一为OLED面板供电的电源电路，该为OLED面板供电的电源电路可以根据OLED面板显示一帧画面时的平均电流来调整DC-DC变换电路输出的电压。对于该为OLED面板供电的电源电路，预设时长可以为所述OLED面板显示一帧画面所需的时长；电流控制器14可根据电流感应器15实时检测到的OLED面板10显示第N帧画面时的电流确定OLED面板10显示第N帧画面时的平均电流；并根据所述OLED面板显示第N帧画面时的平均电流生成控制信号并输出给软启动电路13；软启动电路13可以在OLED面板10加载每帧画面的数据信号时，向DC-DC变换电路输出预设的脉冲信号；并在OLED面板10显示第N+k+1帧画面时，根据接收到的控制信号向DC-DC变换电路输出调整后的脉冲信号；在该实施例中，目标电流可以为OLED面板10显示第N帧画面时的平均电流；所述DC-DC变换电路在显示第N+k+1帧画面时输出调整后的电压时所能够输出的电流的最大值不小于所述目标电流。
例如，在一个实施例中，k＝0，也就是说，在该情形中，DC-DC变换电路要根据OLED面板显示第N帧画面时DC-DC变换电路向该 OLED面板输出的平均电流，来降低该DC-DC变换电路在OLED面板显示第N+1帧画面时输出的电压；并且该DC-DC变换电路在输出降低后的电压时所能够输出的电流的最大值可大于OLED面板显示第N帧画面时DC-DC变换电路向该OLED面板输出的平均电流。
DC-DC变换电路可包括Boost电路和Buck-Boost电路，DC-DC变换电路输出的电压可以为Boost电路输出的第一电源信号VDD的电压和Buck-Boost电路输出的第二电源信号VSS的电压之差；因此，对于通过调节Buck-Boost电路输出的第二电源信号VSS的电压来调节DC-DC变换电路的输出电压的情形，本发明的该实施例提供的为OLED面板供电的电源电路同样可以参照图1，其中的软启动电路13可以在所述OLED面板10加载每帧画面的数据信号时向Buck-Boost电路12输出预设的脉冲信号；并在OLED面板10显示第N+k+1帧画面时，根据接收到的控制信号向Buck-Boost电路12输出调整后的脉冲信号；Buck-Boost电路12可以在接收到预设的脉冲信号时，输出电压值等于第一电源信号VDD的电压与所述预设的电压之差的第二电源信号VSS；并在接收到调整后的脉冲信号时，升高Buck-Boost电路12输出的第二电源信号VSS的电压。
在一个实施例中，在OLED面板10显示第N+k+1帧画面时，DC-DC变换电路在输出调整后的电压时所能够输出的电流的最大值可以等于所述目标电流，也就是等于OLED面板10显示第N帧画面时的平均电流，这样可以进一步降低为OLED面板供电的电源电路的功耗，从而进一步提高为OLED面板供电的电源电路的效率。
如图2所示，提供了本发明的另一实施例提供的为OLED面板供电的电源电路，其还包括保护电路21，其可接收使能信号EN，并在使能信号EN的电压在安全范围内时，触发DC-DC变换电路启动。其中使能信号EN可以为脉冲信号。
进一步地，保护电路21还可以在使能信号EN的电压大于所述安全范围的最大值时，保持DC-DC变换电路处于未启动的状态，从而避免为OLED面板供电的电源电路受到大电压的冲击。
对于上述实施例，由于为OLED面板供电的电源电路中增加了电流感应器、电流控制器和软启动电路，而增加的电路会消耗一部分电能，这可能会导致在本发明实施例的为OLED面板供电的电源电路和 现有的DC-DC变换电路输出相同的电压时，本发明实施例的为OLED面板供电的电源电路能够输出的电流的最大值小于现有技术中的DC-DC变换电路能够输出的电流的最大值，因此，如图3所示，本发明的又一实施例提供的为OLED面板供电的电源电路还可包括电流-温度补偿电路31，其可对本发明实施例提供的OLED面板输出的电流进行补偿，使得在本发明实施例的为OLED面板供电的电源电路和现有的DC-DC变换电路在输出相同的电压的情况下，本发明实施例的为OLED面板供电的电源电路能够输出的电流的最大值能够等于现有技术中的DC-DC变换电路能够输出的电流的最大值。
进一步地，DC-DC变换电路输出的电流本身可能对温度敏感，因此还可以对温度进行补偿，以使得OLED面板供电的电源电路输出的电流不受温度的影响。例如，电流-温度补偿电路31可以每一帧对为OLED面板供电的电源电路输出的电流进行一次温度补偿。
本发明实施例提供的为OLED面板供电的电源电路中的电流感应器、电流控制器、软启动电路、电流-温度补偿电路可以全部集成在DC-DC变换电路中，也可以部分集成在DC-DC变换电路中，另一部分设置在DC-DC变换电路之外，还可以全部设置在DC-DC变换电路之外。
本发明的又一实施例还提供一种显示面板，其包括本发明实施例提供的为OLED面板供电的电源电路。
本领域技术人员可以理解附图只是一个优选实施例的示意图，附图中的模块或流程并不一定是实施本发明所必须的。
本领域技术人员可以理解实施例中的装置中的模块可以按照实施例描述进行分布于实施例的装置中，也可以进行相应变化位于不同于本实施例的一个或多个装置中。上述实施例的模块可以合并为一个模块，也可以进一步拆分成多个子模块。
上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (8)

  1. 一种为有机发光二极管OLED面板供电的电源电路，包括DC-DC变换电路、电流感应器、电流控制器和软启动电路；
    所述电流感应器，用于实时检测所述DC-DC变换电路输出给所述OLED面板的电流；
    所述电流控制器，用于根据所述电流感应器实时检测到的电流，生成控制信号并输出给所述软启动电路；
    所述软启动电路，用于在预设时长期间向所述DC-DC变换电路输出预设的脉冲信号；并在相邻两次输出预设的脉冲信号的时间段之间，根据接收到的控制信号向所述DC-DC变换电路输出调整后的脉冲信号；
    所述DC-DC变换电路，用于在接收到预设的脉冲信号时，输出预设的电压；并在接收到调整后的脉冲信号时，输出降低的电压；
    其中，所述DC-DC变换电路在输出降低后的电压时所能够输出的电流的最大值不小于目标电流，所述目标电流是所述DCDC电路在最近一次接收到预设的脉冲信号的时刻之前的k个预设时长之前的时间输出给所述OLED面板的电流，k为自然数。
  2. 如权利要求1所述的电源电路，其中所述预设时长为所述OLED面板显示一帧画面所需的时长；
    所述电流控制器用于根据所述电流感应器实时检测到的所述OLED面板显示第N帧画面时的电流，确定所述OLED面板显示第N帧画面时的平均电流；并根据所述OLED面板显示第N帧画面时的平均电流生成控制信号并输出给所述软启动电路；
    所述软启动电路，用于在所述OLED面板加载每帧画面的数据信号时，向所述DC-DC变换电路输出预设的脉冲信号；并在所述OLED面板显示第N+k+1帧画面时，根据接收到的控制信号向所述DC-DC变换电路输出调整后的脉冲信号；
    其中，所述目标电流为所述OLED面板显示第N帧画面时的平均电流；所述DC-DC变换电路在显示第N+k+1帧画面时输出调整后的电压时所能够输出的电流的最大值不小于所述目标电流。
  3. 如权利要求1所述的电源电路，其中k＝0。
  4. 如权利要求2所述的电源电路，其中所述DC-DC变换电路包括升压电路和降压-升压电路，所述DC-DC变换电路输出的电压为所述升压电路输出的第一电源信号的电压与所述降压-升压电路输出的第二电源信号的电压之差；
    所述软启动电路用于在所述OLED面板加载每帧画面的数据信号时，向所述降压-升压电路输出预设的脉冲信号；并在所述OLED面板显示第N+k+1帧画面时，根据接收到的控制信号向所述降压-升压电路输出调整后的脉冲信号；
    所述降压-升压电路，用于在接收到预设的脉冲信号时，输出电压值等于第一电源信号的电压与所述预设的电压之差的第二电源信号；并在接收到调整后的脉冲信号时，升高所述降压-升压电路输出的第二电源信号的电压。
  5. 如权利要求2所述的电源电路，其中在所述OLED面板显示第N+k+1帧画面时，所述DC-DC变换电路在输出降低的电压时所能够输出的电流的最大值等于所述目标电流。
  6. 如权利要求1所述的电源电路，其中所述电源电路还包括保护电路；所述保护电路，用于接收使能信号，并在所述使能信号的电压在安全范围内时，触发所述DC-DC变换电路启动。
  7. 如权利要求6所述的电源电路，其中所述保护电路还用于，在所述使能信号的电压大于所述安全范围的最大值时，保持所述DC-DC变换电路处于未启动的状态。
  8. 一种显示面板，包括如权利要求1～7任一所述的为有机发光二极管OLED面板供电的电源电路。
PCT/CN2016/075788 2015-05-29 2016-03-07 一种为有机发光二极管供电的电源电路和显示面板 Ceased WO2016192426A1 (zh)

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