WO2017118070A1 - 电源电压控制电路、方法、驱动集成电路和显示装置 - Google Patents

电源电压控制电路、方法、驱动集成电路和显示装置 Download PDF

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Publication number
WO2017118070A1
WO2017118070A1 PCT/CN2016/098348 CN2016098348W WO2017118070A1 WO 2017118070 A1 WO2017118070 A1 WO 2017118070A1 CN 2016098348 W CN2016098348 W CN 2016098348W WO 2017118070 A1 WO2017118070 A1 WO 2017118070A1
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WIPO (PCT)
Prior art keywords
power supply
voltage
supply voltage
voltage control
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2016/098348
Other languages
English (en)
French (fr)
Inventor
张博雅
孟昭晖
张成庚
张林涛
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
Original Assignee
BOE Technology Group Co Ltd
Ordos Yuansheng Optoelectronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BOE Technology Group Co Ltd, Ordos Yuansheng Optoelectronics Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US15/508,315 priority Critical patent/US10386873B2/en
Publication of WO2017118070A1 publication Critical patent/WO2017118070A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/46—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC
    • G05F1/461—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC using an operational amplifier as final control device
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • 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
    • 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]
    • G09G3/3225—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] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0291—Details of output amplifiers or buffers arranged for use in a driving circuit
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0204—Compensation of DC component across the pixels in flat panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
    • 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
    • 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
    • G09G2330/021—Power management, e.g. power saving

Definitions

  • the present disclosure relates to a power supply voltage control circuit, method, drive integrated circuit, and display device.
  • the conventional display panel is controlled by the power supply circuit directly providing an output power voltage to an Organic Light-Emitting Diode (OLED) display panel.
  • OLED Organic Light-Emitting Diode
  • the power supply voltage output from the power supply circuit has a large influence on the gamma voltage, and the gamma display voltage is already programmed on the driver integrated circuit when the OLED display panel is shipped ( Integrated Circuit (IC), but in general, the power circuit will be placed on the motherboard, and then passed through the Flexible Printed Circuit (FPC) to reach the OLED display panel. There will be some in the middle. Pressure drop loss.
  • IC Integrated Circuit
  • FPC Flexible Printed Circuit
  • the layout of the peripheral circuit of the power supply circuit also has a great influence on the power supply voltage outputted by the power supply circuit, so that the power supply voltage value input to the OLED display panel and the output on the main board to the OLED display panel cannot be guaranteed when the Gamma voltage is burned.
  • the power supply voltage values are the same, which is likely to affect the display of the OLED display.
  • the load will affect the actual output of the power supply voltage, causing the IR drop, which will also have a great impact on the display effect of the OLED display panel.
  • the present disclosure provides a power supply voltage control circuit, method, drive integrated circuit, and display device that solve the problem of voltage drop between a power supply voltage output end of a power supply circuit and a power supply voltage receiving end of a display panel.
  • At least one embodiment of the present disclosure provides a power supply voltage control circuit for a display panel, including: a voltage detecting unit for detecting a power supply voltage received from a power supply circuit by a display panel; and a comparing unit configured to obtain the a voltage difference between the power supply voltage and the reference voltage; and a power supply voltage control unit configured to transmit a power supply voltage control signal to the power supply circuit according to the voltage difference and the reference voltage, so that the power supply circuit is The display panel outputs the corresponding electricity Source voltage.
  • the power voltage control circuit further includes an amplifying unit that amplifies a voltage difference from the comparing unit and transmits the amplified voltage difference to the power voltage control unit.
  • the power voltage control signal is a pulse signal based on a single bus protocol, and the magnitude of the power voltage output by the power circuit to the display panel corresponds to the number of pulses of the pulse signal.
  • the supply voltage includes a positive supply voltage and a negative supply voltage.
  • the reference voltage includes a first reference voltage and a second reference voltage.
  • the voltage detecting unit is configured to detect a positive power supply voltage and a negative power supply voltage from the power supply circuit received by the display panel, and the comparing unit is configured to obtain, between the positive power supply voltage and the first reference voltage, by comparison a first voltage difference, and obtaining a second voltage difference between the negative power supply voltage and the second reference voltage by comparison;
  • the power supply voltage control unit configured to determine the first voltage difference and the first Transmitting a first power voltage control signal to the power circuit by a reference voltage to cause the power circuit to output a corresponding positive power voltage to the display panel, and further for using the second voltage difference and the second reference
  • the voltage transmits a second power voltage control signal to the power circuit such that the power circuit outputs a corresponding negative power voltage to the display panel.
  • the amplifying unit is configured to respectively amplify the first voltage difference and the second voltage difference from the comparing unit, and send the amplified first voltage difference and the amplified second voltage difference to the The power supply voltage control unit.
  • the comparison unit includes a first comparison module and a second comparison module.
  • the first comparison module includes a first operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor.
  • the first operational amplifier the non-inverting input terminal is connected to the positive power supply voltage through the fourth resistor, the inverting input terminal is connected to the first reference voltage through the first resistor, and the output end is passed through the third A resistor is coupled to the non-inverting input of the first operational amplifier.
  • the inverting input of the first operational amplifier is also grounded through the second resistor.
  • the first operational amplifier outputs the first voltage difference through its output.
  • the second comparison module includes a second operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor.
  • the second operational amplifier the non-inverting input terminal is connected to the negative power supply voltage through the eighth resistor, the inverting input terminal is connected to the second reference voltage through the fifth resistor, and the output end passes the seventh A resistor is coupled to the non-inverting input of the second operational amplifier.
  • the inverting input of the second operational amplifier is also grounded through the sixth resistor.
  • the second operational amplifier outputs the second voltage difference through its output.
  • the amplifying unit includes a first amplifying module and a second amplifying module.
  • the first amplification module includes a third operational amplifier, a ninth resistor, and a tenth resistor.
  • the third operational amplifier has a non-inverting input connected to an output of the first operational amplifier, an inverting input connected to the ground through the tenth resistor, and an output through the ninth resistor and the third operational amplifier The inverting input is connected.
  • the third operational amplifier outputs an amplified first voltage difference through its output terminal.
  • the second amplification module includes a fourth operational amplifier, an eleventh resistor, and a twelfth resistor.
  • the fourth operational amplifier the non-inverting input terminal is connected to the output end of the second operational amplifier, the inverting input terminal is grounded through the twelfth resistor, and the output end passes the eleventh resistor and the fourth operation The inverting input of the amplifier is connected.
  • the fourth operational amplifier outputs an amplified second voltage difference through its output terminal.
  • the power voltage control unit includes a first voltage control module and a second voltage control module.
  • the first voltage control module is configured to generate a first power voltage control signal according to the amplified first voltage difference and the first reference voltage, and send the first power voltage control signal to the power circuit, So that the power supply circuit outputs a positive power supply voltage according to the first power voltage control signal; the first power voltage control signal is a pulse signal based on a single bus protocol.
  • the second voltage control module is configured to generate a second power voltage control signal according to the amplified second voltage difference and the second reference voltage, and send the second power voltage control signal to the power circuit,
  • the power supply circuit outputs a negative power supply voltage according to the second power voltage control signal; the second power voltage control signal is a pulse signal based on a single bus protocol.
  • the amplified first voltage difference outputted by the third operational amplifier is a digital signal
  • the amplified second voltage difference output by the fourth operational amplifier is a digital signal
  • the first voltage control module is further used Performing digital-to-analog conversion on the amplified first voltage difference, and processing the amplified first voltage difference such that its accuracy is the same as the accuracy of the first reference voltage
  • the voltage control module is further configured to perform digital-to-analog conversion on the amplified second voltage difference, and process the amplified second voltage difference such that the accuracy thereof is the same as the accuracy of the second reference voltage.
  • the supply voltage includes a positive supply voltage or a negative supply voltage.
  • the reference voltage includes a first reference voltage.
  • the comparing unit is configured to obtain a first voltage difference between the power supply voltage and the first reference voltage by comparing
  • the power voltage control unit is configured to send a first power voltage control signal to the power circuit according to the first voltage difference and the first reference voltage, so that the power circuit outputs corresponding to the display panel voltage.
  • the amplifying unit is configured to amplify a first voltage difference from the comparing unit, and send the amplified first voltage difference to the power voltage control unit.
  • the comparison unit includes a first comparison module.
  • the first comparison module includes a first operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor.
  • the first operational amplifier the non-inverting input terminal is connected to the positive power supply voltage or the negative power supply voltage through the fourth resistor, and the inverting input terminal is connected to the first reference voltage through the first resistor, and the output end passes
  • the third resistor is coupled to the non-inverting input of the first operational amplifier.
  • the inverting input of the first operational amplifier is also grounded through the second resistor.
  • the first operational amplifier outputs the first voltage difference through its output.
  • the amplifying unit includes a first amplifying module.
  • the first amplification module includes a second operational amplifier, a fifth resistor, and a sixth resistor.
  • the second operational amplifier has a non-inverting input connected to an output of the first operational amplifier, an inverting input connected to the ground through the sixth resistor, and an output through the fifth resistor and the second operational amplifier The inverting input is connected.
  • the second operational amplifier outputs an amplified first voltage difference through its output terminal.
  • the supply voltage control unit includes a first voltage control module.
  • the first voltage control module is configured to generate a first power voltage control signal according to the amplified first voltage difference and the first reference voltage, and send the first power voltage control signal to the power circuit,
  • the power supply circuit outputs a positive power supply voltage or a negative power supply voltage according to the first power supply voltage control signal; the first power supply voltage control signal is a pulse signal based on a single bus protocol.
  • the amplified first voltage difference output by the second operational amplifier is a digital signal.
  • the first voltage control module is further configured to perform digital-to-analog conversion on the amplified first voltage difference, and process the amplified first voltage difference such that the accuracy thereof is the same as the accuracy of the first reference voltage .
  • At least one embodiment of the present disclosure also provides a power supply voltage control method applied to the above-described power supply voltage control circuit, the power supply voltage control method comprising: a voltage detecting step: detecting, by the voltage detecting unit, a power supply circuit received by the display panel a power supply voltage; a comparison step: the comparison unit obtains a voltage difference between the power supply voltage and the reference voltage by comparison; a power supply voltage control step: the power supply voltage control unit sends the power supply voltage to the power supply circuit according to the voltage difference and the reference voltage The power supply voltage control signal causes the power supply circuit to output a corresponding power supply voltage to the display panel.
  • the method further includes: an amplifying step: the amplifying unit amplifies the voltage difference from the comparing unit, and sends the amplified voltage difference to the power voltage control unit.
  • the power voltage control signal is a pulse signal based on a single bus protocol, and the magnitude of the power voltage output by the power circuit to the display panel corresponds to the number of pulses of the pulse signal.
  • the power supply voltage includes a positive power supply voltage and a negative power supply voltage
  • the reference voltage includes a first reference voltage and a second reference voltage
  • the voltage detecting step includes: the voltage detecting unit detects that the display panel receives the a positive power supply voltage and a negative power supply voltage of the power supply circuit
  • the comparing step includes: the comparing unit obtains a first voltage difference between the positive power supply voltage and the first reference voltage by comparison, and obtains the comparison by comparison a second voltage difference between the negative power supply voltage and the second reference voltage
  • the power supply voltage control step includes: the power supply voltage control unit to the power supply according to the first voltage difference and the first reference voltage
  • the circuit transmits a first power voltage control signal to cause the power circuit to output a corresponding positive power voltage to the display panel, and is further configured to send the power voltage to the power circuit according to the second voltage difference and the second reference voltage
  • the second power voltage control signal causes the power circuit to output a corresponding negative power voltage to the display panel.
  • the power supply voltage includes a positive power supply voltage or a negative power supply voltage
  • the reference voltage includes a first reference voltage
  • the comparing step includes: the comparing unit obtains the power supply voltage and the first reference voltage by comparison a first voltage difference between the power supply voltage control steps: the power supply voltage control unit is directed to the power supply according to the first voltage difference and the first reference voltage
  • the circuit transmits a first supply voltage control signal to cause the power supply circuit to output a corresponding supply voltage to the display panel.
  • At least one embodiment of the present disclosure also provides a driver integrated circuit including the above-described power supply voltage control circuit.
  • At least one embodiment of the present disclosure also provides a display device including a display panel, a power supply circuit, and the above-described driving integrated circuit;
  • the driving integrated circuit includes a power supply voltage control circuit for detecting a power supply voltage received by the display panel from the power supply circuit, and according to a voltage difference between the power supply voltage and a reference voltage, to the power supply circuit A power supply voltage control signal is transmitted to cause the power supply circuit to output a corresponding power supply voltage to the display panel.
  • the power supply voltage control signal is a pulse signal based on a single bus protocol.
  • the voltage output of the power supply circuit controlled by the command of the pulse signal of the single bus protocol is stored in the power supply circuit in the form of a lookup table.
  • At least one embodiment of the present disclosure provides a power supply voltage control circuit, a method, a driving integrated circuit, and a display device.
  • the voltage detecting unit detects a power supply voltage of a power supply circuit actually received by a display panel, according to the actual measured power supply voltage and a predetermined
  • the voltage difference of the set reference voltage is used to control the power supply voltage output from the power supply circuit to the display panel, and the voltage drop loss during the voltage transmission process is compensated, the display effect of the product can be optimized, and the voltage of the output end of the power supply circuit to the display panel end is effectively improved. Reduce the loss and ensure the consistency of the input voltage on the display panel.
  • FIG. 1 is a structural block diagram of a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure
  • FIG. 2 is a structural block diagram of a power supply voltage control circuit of a display panel according to another embodiment of the present disclosure
  • FIG. 3 is a structural block diagram of a power supply voltage control circuit of a display panel according to another embodiment of the present disclosure.
  • FIG. 4A is a circuit diagram of a first comparison module included in a comparison unit in a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure
  • 4B is a circuit diagram of a second comparison module included in a comparison unit in a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure
  • 5A is a circuit diagram of a first amplifying module included in a comparison unit in a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure
  • 5B is a circuit diagram of a second amplifying module included in a comparison unit in a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure
  • 6A is a flowchart of a method for controlling a power supply voltage of a display panel according to an embodiment of the present disclosure
  • 6B is a flowchart of a method for controlling a power supply voltage of a display panel according to another embodiment of the present disclosure
  • FIG. 7 is a schematic structural diagram of a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure applied to an OLED display panel.
  • FIG. 1 is a structural block diagram of a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure.
  • the power supply voltage control circuit of the display panel provided by the embodiment of the present disclosure includes: a voltage detecting unit 11 configured to detect a power supply voltage from a power supply circuit received by the display panel; a comparison unit 12, and the voltage detection a unit 11 connected for obtaining a voltage difference between the power supply voltage and a reference voltage by comparison; and a power supply voltage control unit 13 connected to the comparison unit 12 for using the voltage difference and the reference voltage And transmitting a power voltage control signal to the power circuit to cause the power circuit to output a corresponding power voltage to the display panel.
  • the power supply voltage received by the display panel is a driving voltage for driving the display panel.
  • the power supply voltage may include a positive power supply voltage and a negative power supply voltage.
  • the power supply voltage control circuit of the display panel detects the power supply voltage of the power supply circuit actually received by the display panel through the voltage detecting unit, according to the voltage difference between the actually measured power supply voltage and a preset reference voltage. Controlling the power supply voltage output from the power supply circuit to the display panel, compensating for the voltage drop loss during voltage transmission, optimizing the display effect of the product, effectively improving the voltage drop loss from the output end of the power supply circuit to the display panel end, and ensuring the input voltage of the display panel end consistency.
  • FIG. 2 is a structural block diagram of a power supply voltage control circuit of a display panel according to another embodiment of the present disclosure.
  • the reference voltage can be provided by reference source 10.
  • the comparison unit 12 and the power supply voltage control unit 13 are both connected to the reference source 10.
  • the preset reference voltage may be as follows: For example, when the display panel is shipped from the factory, the adjusted gamma voltage is already programmed in the driving integrated circuit (IC), and the gamma voltage corresponding to the gamma voltage can be provided to the display. The power supply voltage of the panel is set to the reference voltage.
  • the preset rules for the reference voltage may be other methods, and are not limited to the above setting rules, and are not described herein again.
  • FIG. 3 is a structural block diagram of a power supply voltage control circuit of a display panel according to still another embodiment of the present disclosure.
  • the power supply voltage control circuit according to the embodiment of the present disclosure further includes: an amplifying unit 14 respectively connected to the comparing unit 12 and the power voltage control unit 13 for comparing from the comparison.
  • the voltage difference of the unit 12 is amplified, and the amplified voltage difference is sent to the power supply voltage control unit 13.
  • Amplifying the voltage difference from the comparison unit 12 by the amplifying unit 14 can more accurately perform power supply voltage compensation.
  • the power voltage control signal may be a pulse signal based on a single wire protocol, and the magnitude of the power voltage output by the power circuit to the display panel corresponds to the number of pulses of the pulse signal.
  • the power supply voltage includes a positive power supply voltage and a negative power supply voltage.
  • the reference voltage includes a first reference voltage and a second reference voltage.
  • the voltage detecting unit is configured to detect a positive power supply voltage and a negative power supply voltage from the power supply circuit received by the display panel.
  • the comparing unit is configured to obtain a first voltage difference between the positive power supply voltage and the first reference voltage by comparing, and obtain a comparison between the negative power supply voltage and the second reference voltage by comparing Two voltage differences.
  • the power voltage control unit is configured to send a first power voltage control signal to the power circuit according to the first voltage difference and the first reference voltage, so that the power circuit outputs corresponding to the display panel a positive power supply voltage, configured to send a second power voltage control signal to the power circuit according to the second voltage difference and the second reference voltage, so that the power circuit is The display panel outputs a corresponding negative supply voltage.
  • the embodiment of the power supply voltage control circuit provided by the present disclosure is directed to the case where the power supply voltage supplied to the display panel includes a positive power supply voltage and a negative power supply voltage, respectively, by the power supply detecting unit, the comparing unit, and the power supply voltage control unit,
  • the negative supply voltage operates to detect, compare, and generate a supply voltage control signal such that this embodiment of the supply voltage control circuit provided by the present disclosure can simultaneously compensate for both the positive supply voltage and the negative supply voltage.
  • the amplifying unit is configured to respectively amplify the first voltage difference and the second voltage difference from the comparing unit, and enlarge the first A voltage difference and the amplified second voltage difference are sent to the power supply voltage control unit.
  • the comparison unit includes a first comparison module and a second comparison module.
  • 4A is a circuit diagram of a first comparison module included in a comparison unit of a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure
  • FIG. 4B is a comparison unit included in a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure.
  • the circuit diagram of the second comparison module is a circuit diagram of the second comparison module.
  • the first comparison module includes a first operational amplifier OP1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.
  • the first operational amplifier OP1 the non-inverting input is connected to the positive power supply voltage ELVDD1 from the power supply circuit received by the display panel detected by the voltage detecting unit (not shown in FIG. 4A) through the fourth resistor R4, and the inverting input is inverted.
  • the terminal is connected to the first reference voltage VF1 through the first resistor R1, and the output terminal is connected to the non-inverting input terminal of the first operational amplifier OP1 through the third resistor R3.
  • the inverting input terminal of the first operational amplifier OP1 is also grounded through the second resistor R2.
  • the first operational amplifier OP1 outputs a first voltage difference ⁇ V1 through its output terminal.
  • the potential of the non-inverting input terminal of the first operational amplifier OP1 is V1
  • the potential of the inverting input terminal of the first operational amplifier OP1 is V2.
  • the first comparison module shown in FIG. 4A compares the positive power supply voltage ELVDD1 from the power supply circuit received by the display panel detected by the voltage detecting unit (not shown in FIG. 4A) with the first reference voltage VF1.
  • I R1 is the current flowing through R1
  • I R2 is the current flowing through R2
  • I R3 is the current flowing through R3
  • I R4 is the current flowing through R4.
  • the second comparison module includes a second operational amplifier OP2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8.
  • the second operational amplifier OP2 the non-inverting input is connected to the negative power supply voltage ELVSS1 from the power supply circuit received by the display panel detected by the voltage detecting unit (not shown in FIG. 4A) through the eighth resistor R8, and the inverting input is inverted.
  • the terminal is connected to the second reference voltage VF2 through the fifth resistor R5, and the output terminal is connected to the non-inverting input terminal of the second operational amplifier OP2 through the seventh resistor R7.
  • the inverting input terminal of the second operational amplifier OP2 is also grounded through the sixth resistor R6.
  • the second operational amplifier OP2 outputs a second voltage difference ⁇ V2 through its output terminal.
  • the potential of the non-inverting input terminal of the second operational amplifier OP2 is V3, and the potential of the inverting input terminal of the second operational amplifier OP2 is V4.
  • the second comparison module shown in FIG. 4B compares the negative power supply voltage ELVSS1 and the second reference voltage VF2 from the power supply circuit received by the display panel detected by the voltage detecting unit (not shown in FIG. 4B).
  • I R5 is the current flowing through R5
  • I R6 is the current flowing through R6
  • I R7 is the current flowing through R7
  • I R8 is the current flowing through R8.
  • the amplifying unit includes a first amplifying module and a second amplifying module.
  • 5A is a circuit diagram of a first amplifying module included in a comparison unit of a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure
  • FIG. 5B is a comparison unit included in a power supply voltage control circuit of the display panel according to an embodiment of the present disclosure.
  • the first amplification module includes a third operational amplifier OP3, a ninth resistor R9, and a tenth resistor R10.
  • the third operational amplifier OP3, the non-inverting input terminal is connected to the output end of the first operational amplifier OP1 (not shown in FIG. 5A) (ie, the potential V5 of the non-inverting input terminal of the OP3 is the first voltage difference ⁇ V1)
  • the inverting input terminal is grounded through the tenth resistor R10, and the output terminal is connected to the inverting input terminal of the third operational amplifier OP3 through the ninth resistor R9.
  • the potential of the inverting input terminal of the third operational amplifier OP3 is V6.
  • the third operational amplifier OP3 outputs an amplified first voltage difference through its output terminal ⁇ AV1.
  • V5 V6
  • I R9 I R10
  • I R9 is the current flowing through R9
  • I R10 is the current flowing through R10.
  • the second amplification module includes a fourth operational amplifier OP4, an eleventh resistor R11, and a twelfth resistor R12.
  • the fourth operational amplifier OP4 the non-inverting input terminal is connected to the output end of the second operational amplifier OP2 (not shown in FIG. 5B) (ie, the potential V7 of the non-inverting input terminal of the OP4 is the second voltage difference ⁇ V2)
  • the inverting input terminal is grounded through the twelfth resistor R12, and the output terminal is connected to the inverting input terminal of the fourth operational amplifier OP4 through the eleventh resistor R11.
  • the potential of the inverting input terminal of the fourth operational amplifier OP4 is V8.
  • the fourth operational amplifier OP4 outputs the amplified second voltage difference ⁇ AV2 through its output terminal.
  • I R11 is the current flowing through R11
  • I R12 is the current flowing through R12.
  • the power voltage control unit includes a first voltage control module and a second voltage control module.
  • the first voltage control module is configured to generate a first power voltage control signal according to the amplified first voltage difference and the first reference voltage, and send the first power voltage control signal to the power circuit,
  • the power supply circuit outputs a positive power supply voltage according to the first power voltage control signal;
  • the first power voltage control signal is a pulse signal based on a single bus protocol; and the positive power supply voltage output by the power circuit to the display panel
  • the size corresponds to the number of pulses of the first power voltage control signal.
  • the second voltage control module is configured to generate a second power voltage control signal according to the amplified second voltage difference and the second reference voltage, and send the second power voltage control signal to the power circuit,
  • the power supply circuit outputs a negative power supply voltage according to the second power voltage control signal;
  • the second power voltage control signal is a pulse signal based on a single bus protocol; and the negative power supply voltage output by the power circuit to the display panel
  • the size corresponds to the number of pulses of the second power voltage control signal.
  • the power supply voltage control circuit uses the first voltage control module and the second voltage control module to respectively generate the first power voltage control signal and the second power voltage for the case where the power voltage includes the positive power voltage and the negative power voltage.
  • the control signal is used to separately adjust the positive power supply voltage and the negative power supply voltage output from the power supply circuit.
  • the amplified first voltage difference ⁇ AV1 outputted by the third operational amplifier OP3 shown in FIG. 5A is a digital signal
  • the amplified second voltage difference ⁇ AV2 outputted by the fourth operational amplifier OP4 shown in FIG. 5B is shown.
  • digital signals For digital signals.
  • the first voltage control module needs to first perform digital-to-analog conversion on the amplified first voltage difference ⁇ AV1, and then process the amplified first voltage difference ⁇ AV1 to make the accuracy and the first reference voltage The accuracy is the same.
  • the second voltage control module needs to first perform digital-to-analog conversion on the amplified second voltage difference ⁇ AV2, and then process the amplified second voltage difference ⁇ AV2 to make the accuracy and the second reference voltage The accuracy is the same.
  • the power supply voltage may also include only one power supply voltage, that is, the power supply voltage includes a positive power supply voltage or a negative power supply voltage.
  • the reference voltage includes a first reference voltage.
  • the comparing unit is configured to obtain a first voltage difference between the power supply voltage and the first reference voltage by comparison.
  • the power voltage control unit is configured to send a first power voltage control signal to the power circuit according to the first voltage difference and the first reference voltage, so that the power circuit outputs corresponding to the display panel voltage.
  • the amplifying unit is configured to amplify a first voltage difference from the comparing unit, and send the amplified first voltage difference to the The power supply voltage control unit.
  • the comparison unit when the power supply voltage includes a positive power supply voltage or a negative power supply voltage, the comparison unit includes a first comparison module.
  • the first comparison module includes a first operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor.
  • the first operational amplifier the non-inverting input terminal is connected to the positive power supply voltage or the negative power supply voltage through the fourth resistor, and the inverting input terminal is connected to the first reference voltage through the first resistor, and the output end passes
  • the third resistor is coupled to the non-inverting input of the first operational amplifier.
  • the inverting input of the first operational amplifier is also grounded through the second resistor.
  • the first operational amplifier outputs the first voltage difference through its output.
  • the power supply voltage includes a positive power supply voltage or a negative power supply voltage
  • the amplification unit includes a first amplification module.
  • the first amplification module includes a second operational amplifier, a fifth resistor, and a sixth resistor.
  • the second operational amplifier has a non-inverting input connected to an output of the first operational amplifier, an inverting input connected to the ground through the sixth resistor, and an output through the fifth resistor and the second operational amplifier The inverting input is connected.
  • the second operational amplifier outputs an amplified first voltage difference through its output terminal.
  • the power supply voltage control unit includes a first voltage control module.
  • the first voltage control module is configured to generate a first power voltage control signal according to the amplified first voltage difference and the first reference voltage, and send the first power voltage control signal to the power circuit,
  • the power supply circuit outputs a positive power supply voltage or a negative power supply voltage according to the first power supply voltage control signal; the first power supply voltage control signal is a pulse signal based on a single bus protocol.
  • the amplified first voltage difference output by the second operational amplifier is a digital signal.
  • the first voltage control module is further configured to perform digital-to-analog conversion on the amplified first voltage difference, and process the amplified first voltage difference such that the accuracy thereof is the same as the accuracy of the first reference voltage .
  • Embodiments of the present disclosure also provide a power supply voltage control method applied to the above-described power supply voltage control circuit.
  • FIG. 6A is a flowchart of a method for controlling a power supply voltage of a display panel according to an embodiment of the present disclosure. As shown in FIG. 6A, the power supply voltage control method includes the following steps.
  • Voltage detection step 61 The voltage detection unit detects a power supply voltage from the power supply circuit received by the display panel.
  • Comparing step 62 comparing the obtained power supply voltage between the reference voltage and the reference voltage Voltage difference.
  • the power supply voltage control step 63 the power supply voltage control unit transmits a power supply voltage control signal to the power supply circuit according to the voltage difference and the reference voltage, so that the power supply circuit outputs a corresponding power supply voltage to the display panel.
  • the power supply voltage control method of the display panel detects the power supply voltage of the power supply circuit actually received by the display panel through the voltage detecting unit, and according to the voltage difference between the actually measured power supply voltage and the preset reference voltage. To control the power supply voltage output from the power supply circuit to the display panel, compensate the voltage drop loss during voltage transmission, optimize the display effect of the product, effectively improve the voltage drop loss from the output end of the power supply circuit to the display panel end, and ensure the input voltage of the display panel end. Consistency.
  • FIG. 6B is a flowchart of a method for controlling a power supply voltage of a display panel according to another embodiment of the present disclosure. As shown in FIG. 6A, the method differs from the method shown in FIG. 6A in that an amplification step 60 is further included between the comparison step 62 and the power supply voltage control step 63: the amplification unit performs a voltage difference from the comparison unit. Amplifying and transmitting the amplified voltage difference to the power supply voltage control unit.
  • Amplifying the voltage difference from the comparison unit 12 by the amplifying unit can more accurately perform power supply voltage compensation.
  • the power voltage control signal is a pulse signal based on a single bus protocol, and the magnitude of the power voltage output by the power circuit to the display panel corresponds to the number of pulses of the pulse signal.
  • the supply voltage includes a positive supply voltage and a negative supply voltage.
  • the reference voltage includes a first reference voltage and a second reference voltage.
  • the voltage detecting step includes the voltage detecting unit detecting a positive power supply voltage and a negative power supply voltage from the power supply circuit received by the display panel.
  • the comparing step includes: the comparing unit obtains a first voltage difference between the positive power supply voltage and the first reference voltage by comparing, and obtains the negative power supply voltage and the second reference voltage by comparison The second voltage difference between.
  • the power supply voltage control step includes: the power supply voltage control unit transmitting a first power supply voltage control signal to the power supply circuit according to the first voltage difference and the first reference voltage, so that the power supply circuit is The display panel outputs a corresponding positive power supply voltage, and is further used according to the second The voltage difference and the second reference voltage send a second supply voltage control signal to the power supply circuit to cause the power supply circuit to output a corresponding negative supply voltage to the display panel.
  • the supply voltage includes a positive supply voltage or a negative supply voltage.
  • the reference voltage includes a first reference voltage.
  • the comparing step includes the comparing unit obtaining a first voltage difference between the power supply voltage and the first reference voltage by comparison.
  • the power supply voltage control step includes: the power supply voltage control unit transmitting a first power supply voltage control signal to the power supply circuit according to the first voltage difference and the first reference voltage, so that the power supply circuit is The display panel outputs the corresponding power supply voltage.
  • Embodiments of the present disclosure also provide a driver integrated circuit including the above-described power supply voltage control circuit.
  • Embodiments of the present disclosure also provide a display device including a display panel, a power supply circuit, and the above-described driving integrated circuit.
  • the driving integrated circuit includes a power supply voltage control circuit for detecting a power supply voltage received by the display panel from the power supply circuit, and according to a voltage difference between the power supply voltage and a reference voltage, to the power supply circuit A power supply voltage control signal is transmitted to cause the power supply circuit to output a corresponding power supply voltage to the display panel.
  • the supply voltage control signal may be a pulse signal based on a single bus protocol.
  • the voltage output of the power supply circuit controlled by the instruction of the pulse signal based on the single bus protocol is stored in the power supply circuit in the form of a lookup table, so that the voltage to be output by the power supply circuit can be determined conveniently and quickly according to the lookup table.
  • the power supply voltage control of the OLED display panel will be described below as an example.
  • the power supply voltage control circuit and method of the display panel provided by the present disclosure at the time of implementation are not limited to application to an OLED display panel, and may be applied to a liquid crystal display panel or any type of display panel known.
  • the power supply circuit is disposed on the main board, and the power supply voltage control circuit is disposed on the driver IC.
  • the external signal source provides a signal to the main board, and the power supply circuit starts to work and outputs two voltages: positive power supply voltage (ie, driving the positive driving voltage of the OLED display panel) ELVDD and negative power supply voltage (ie, driving the negative driving voltage of the OLED display panel) ELVSS
  • positive power supply voltage ie, driving the positive driving voltage of the OLED display panel
  • negative power supply voltage ie, driving the negative driving voltage of the OLED display panel
  • the Driver IC determines the voltage value to be compensated, and controls the voltage output of the power supply circuit through the s-wire signal (the s-wire signal, that is, the power supply voltage control signal in the form of a single pulse signal), wherein the s-wire signal
  • the s-wire signal that is, the power supply voltage control signal in the form of a single pulse signal
  • the voltage output controlled by the command is stored in the power supply circuit in the form of a lookup table.
  • FIG. 7 is a schematic structural diagram of a power supply voltage control circuit of a display panel according to an embodiment of the present disclosure applied to an OLED display panel.
  • the first voltage detecting module 701 included in the power supply voltage control circuit provided on the driving integrated circuit 71 detects the positive power supply voltage actually received by the OLED display panel 72, and passes the positive power supply voltage through the first comparing module 702.
  • the first voltage control module 705 Comparing with the first reference voltage outputted by the first reference source 703 to obtain a first voltage difference, and amplifying the first voltage difference by the first amplification module 704, and outputting the amplified first voltage difference to the first voltage Control module 705, the first voltage control module 705 processes the amplified first voltage difference to obtain the same accuracy as the first reference voltage output by the first reference source 703, and then adds the first reference The voltage, a new positive power supply voltage is obtained, and the number of s-wire signal pulses corresponding to the voltage value is determined by a look-up table, and is fed back to the power supply circuit 73, and the control power supply circuit 73 outputs a new positive power supply voltage.
  • the second voltage detecting module 706 included in the power supply voltage control circuit provided on the driving integrated circuit 71 detects the negative power supply voltage actually received by the OLED display panel 72, and passes the negative power supply voltage and the second reference source 708 through the second comparing module 707.
  • the output second reference voltage is compared to obtain a second voltage difference, and the second voltage difference is amplified by the second amplification module 709, and the amplified second voltage difference is output to the second voltage control module 710.
  • the second voltage control module 710 processes the amplified second voltage difference to obtain the same accuracy as the second reference voltage output by the second reference source 708, and then adds the second reference voltage to obtain a new one.
  • the negative power supply voltage is determined by a lookup table to determine the number of s-wire signal pulses corresponding to the voltage value, and is fed back to the power supply circuit 73, and the control power supply circuit 73 outputs a new negative power supply voltage.
  • Vin is an input voltage signal of the power supply circuit 73
  • the s-wire signal controls the power supply voltage to output a corresponding power supply voltage by a soft start switch that touches the power supply circuit.
  • the DTFT is labeled as a driving transistor
  • the OLED is an organic light emitting diode.
  • the s-wire signal is only related to the data voltage Vdata output by the data line, and the present disclosure makes the s-wire signal also related to the actually detected power supply voltage and the preset reference voltage.
  • each frame will judge the data voltage Vdata and output a set of s-wire signals to control the output voltage of the power supply circuit.
  • the first frame is mainly for recording the reference source and performing the test of the actual power supply voltage at the display panel end, and then outputting the power circuit from the next frame. Correction of the power supply voltage, so that the display effect of the display panel is basically not affected.

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Abstract

一种电源电压控制电路、方法、驱动集成电路和显示装置。该电源电压控制电路包括：电压检测单元（11），用于检测显示面板（72）接收到的来自电源电路（73）的电源电压（ELVDD、ELVSS）；比较单元（12），用于通过比较获得该电源电压（ELVDD、ELVSS）与基准电压（VF1、VF2）之间的电压差；以及，电源电压控制单元（13），用于根据该电压差和该基准电压（VF1、VF2）向该电源电路（73）发送电源电压控制信号，以使得该电源电路（73）向该显示面板（72）输出相应的电源电压用于补偿电压传输过程中的压降损失，优化产品的显示效果，有效改善电源电路的输出端到显示面板端的压降损失，保证显示面板端输入电压的一致性。

Description

电源电压控制电路、方法、驱动集成电路和显示装置 技术领域
本公开涉及一种电源电压控制电路、方法、驱动集成电路和显示装置。
背景技术
传统的显示面板的控制方式均是电源电路直接提供输出电源电压至有机发光二极管(Organic Light-Emitting Diode，简称OLED)显示面板。对于OLED显示面板而言，电源电路输出的电源电压会对伽马(Gamma)电压产生很大的影响，而在OLED显示面板出厂的时候是已经将调整好的Gamma电压烧录在驱动集成电路(Integrated Circuit，简称IC)里面的，但一般情况下，电源电路会放置在主板上，再经过柔性电路板(Flexible Printed Circuit，简称FPC)的传输后才到达OLED显示面板上，中间会有一定的压降损失。并且电源电路周边电路的布局(layout)也会对电源电路输出的电源电压产生很大的影响，因此无法保证烧录Gamma电压时输入OLED显示面板的电源电压值和主板上输出到OLED显示面板上的电源电压值是一致的，这样就很有可能会影响OLED显示的显示效果。此外，OLED显示面板在实际显示的时候，负载不同也会影响到电源电压的实际输出，引起IR压降(IR drop)的问题，也会对OLED显示面板的显示效果产生很大的影响。
发明内容
本公开提供一种电源电压控制电路、方法、驱动集成电路和显示装置，解决电源电路的电源电压输出端与显示面板的电源电压接收端之间存在压降的问题。
本公开的至少一个实施例提供了一种显示面板的电源电压控制电路，包括：电压检测单元，用于检测显示面板接收到的来自电源电路的电源电压；比较单元，用于通过比较获得所述电源电压与基准电压之间的电压差；以及，电源电压控制单元，用于根据所述电压差和所述基准电压，向所述电源电路发送电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电 源电压。
实施时，所述电源电压控制电路还包括：放大单元，用于对来自所述比较单元的电压差进行放大，并将放大后的电压差发送至所述电源电压控制单元。
实施时，所述电源电压控制信号为基于单总线协议的脉冲信号，所述电源电路向所述显示面板输出的电源电压的大小与所述脉冲信号的脉冲个数对应。
实施时，所述电源电压包括正电源电压和负电源电压。所述基准电压包括第一基准电压和第二基准电压。所述电压检测单元，用于检测显示面板接收到的来自电源电路的正电源电压和负电源电压；所述比较单元，用于通过比较获得所述正电源电压与所述第一基准电压之间的第一电压差，并通过比较获得所述负电源电压与所述第二基准电压之间的第二电压差；所述电源电压控制单元，用于根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的正电源电压，还用于根据所述第二电压差和所述第二基准电压向所述电源电路发送第二电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的负电源电压。
实施时，所述放大单元，用于分别对来自所述比较单元的第一电压差和第二电压差进行放大，并将放大后的第一电压差和放大后的第二电压差发送至所述电源电压控制单元。
实施时，所述比较单元包括第一比较模块和第二比较模块。
所述第一比较模块包括第一运算放大器、第一电阻、第二电阻、第三电阻和第四电阻。
所述第一运算放大器，同相输入端通过所述第四电阻接入所述正电源电压，反相输入端通过所述第一电阻接入所述第一基准电压，输出端通过所述第三电阻与所述第一运算放大器的同相输入端连接。
所述第一运算放大器的反相输入端还通过所述第二电阻接地。
所述第一运算放大器通过其输出端输出所述第一电压差。
所述第二比较模块包括第二运算放大器、第五电阻、第六电阻、第七电阻和第八电阻。
所述第二运算放大器，同相输入端通过所述第八电阻接入所述负电源电压，反相输入端通过所述第五电阻接入所述第二基准电压，输出端通过所述第七电阻与所述第二运算放大器的同相输入端连接。
所述第二运算放大器的反相输入端还通过所述第六电阻接地。
所述第二运算放大器通过其输出端输出所述第二电压差。
实施时，所述放大单元包括第一放大模块和第二放大模块。
所述第一放大模块包括第三运算放大器、第九电阻和第十电阻。
所述第三运算放大器，同相输入端与所述第一运算放大器的输出端连接，反相输入端通过所述第十电阻接地，输出端通过所述第九电阻与所述第三运算放大器的反相输入端连接。
所述第三运算放大器通过其输出端输出放大后的第一电压差。
所述第二放大模块包括第四运算放大器、第十一电阻和第十二电阻。
所述第四运算放大器，同相输入端与所述第二运算放大器的输出端连接，反相输入端通过所述第十二电阻接地，输出端通过所述第十一电阻与所述第四运算放大器的反相输入端连接。
所述第四运算放大器通过其输出端输出放大后的第二电压差。
实施时，所述电源电压控制单元包括第一电压控制模块和第二电压控制模块。
所述第一电压控制模块用于根据所述放大后的第一电压差和所述第一基准电压生成第一电源电压控制信号，并将该第一电源电压控制信号发送至所述电源电路，以使得所述电源电路根据该第一电源电压控制信号输出正电源电压；所述第一电源电压控制信号为基于单总线协议的脉冲信号。
所述第二电压控制模块用于根据所述放大后的第二电压差和所述第二基准电压生成第二电源电压控制信号，并将该第二电源电压控制信号发送至所述电源电路，以使得所述电源电路根据该第二电源电压控制信号输出负电源电压；所述第二电源电压控制信号为基于单总线协议的脉冲信号。
实施时，所述第三运算放大器输出的放大后的第一电压差为数字信号，所述第四运算放大器输出的放大后的第二电压差为数字信号；所述第一电压控制模块还用于对该放大后的第一电压差进行数模转换，并对该放大后的第一电压差进行处理以使得其精度与所述第一基准电压的精度相同；所述第二 电压控制模块还用于对该放大后的第二电压差进行数模转换，并对该放大后的第二电压差进行处理以使得其精度与所述第二基准电压的精度相同。
实施时，所述电源电压包括正电源电压或负电源电压。
所述基准电压包括第一基准电压。
所述比较单元，用于通过比较获得所述电源电压与所述第一基准电压之间的第一电压差；
所述电源电压控制单元，用于根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
实施时，所述放大单元用于对来自所述比较单元的第一电压差进行放大，并将放大后的第一电压差发送至所述电源电压控制单元。
实施时，所述比较单元包括第一比较模块。所述第一比较模块包括第一运算放大器、第一电阻、第二电阻、第三电阻和第四电阻。
所述第一运算放大器，同相输入端通过所述第四电阻接入所述正电源电压或负电源电压，反相输入端通过所述第一电阻接入所述第一基准电压，输出端通过所述第三电阻与所述第一运算放大器的同相输入端连接。
所述第一运算放大器的反相输入端还通过所述第二电阻接地。
所述第一运算放大器通过其输出端输出所述第一电压差。
实施时，所述放大单元包括第一放大模块。所述第一放大模块包括第二运算放大器、第五电阻和第六电阻。
所述第二运算放大器，同相输入端与所述第一运算放大器的输出端连接，反相输入端通过所述第六电阻接地，输出端通过所述第五电阻与所述第二运算放大器的反相输入端连接。
所述第二运算放大器通过其输出端输出放大后的第一电压差。
实施时，所述电源电压控制单元包括第一电压控制模块。
所述第一电压控制模块用于根据所述放大后的第一电压差和所述第一基准电压生成第一电源电压控制信号，并将该第一电源电压控制信号发送至所述电源电路，以使得所述电源电路根据该第一电源电压控制信号输出正电源电压或负电源电压；所述第一电源电压控制信号为基于单总线协议的脉冲信号。
实施时，所述第二运算放大器输出的放大后的第一电压差为数字信号。所述第一电压控制模块还用于对该放大后的第一电压差进行数模转换，并对该放大后的第一电压差进行处理以使得其精度与所述第一基准电压的精度相同。
本公开的至少一个实施例还提供了一种电源电压控制方法，应用于上述的电源电压控制电路，所述电源电压控制方法包括：电压检测步骤：电压检测单元检测显示面板接收到的来自电源电路的电源电压；比较步骤：比较单元通过比较获得所述电源电压与基准电压之间的电压差；电源电压控制步骤：电源电压控制单元根据所述电压差和所述基准电压向所述电源电路发送电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
实施时，在所述比较步骤和电源电压步骤之间还包括：放大步骤：放大单元对来自所述比较单元的电压差进行放大，并将放大后的电压差发送至所述电源电压控制单元。
实施时，所述电源电压控制信号为基于单总线协议的脉冲信号，所述电源电路向所述显示面板输出的电源电压的大小与所述脉冲信号的脉冲个数对应。
实施时，所述电源电压包括正电源电压和负电源电压；所述基准电压包括第一基准电压和第二基准电压；所述电压检测步骤包括：所述电压检测单元检测显示面板接收到的来自电源电路的正电源电压和负电源电压；所述比较步骤包括：所述比较单元通过比较获得所述正电源电压与所述第一基准电压之间的第一电压差，并通过比较获得所述负电源电压与所述第二基准电压之间的第二电压差；所述电源电压控制步骤包括：所述电源电压控制单元根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的正电源电压，还用于根据所述第二电压差和所述第二基准电压向所述电源电路发送第二电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的负电源电压。
实施时，所述电源电压包括正电源电压或负电源电压；所述基准电压包括第一基准电压；所述比较步骤包括：所述比较单元通过比较获得所述电源电压与所述第一基准电压之间的第一电压差；所述电源电压控制步骤包括：所述电源电压控制单元根据所述第一电压差和所述第一基准电压向所述电源 电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
本公开的至少一个实施例还提供了一种驱动集成电路，包括上述的电源电压控制电路。
本公开的至少一个实施例还提供了一种显示装置，包括显示面板、电源电路和上述的驱动集成电路；
所述驱动集成电路包括的电源电压控制电路，用于检测所述显示面板接收到的来自所述电源电路的电源电压，并根据所述电源电压与基准电压之间的电压差向所述电源电路发送电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
实施时，所述电源电压控制信号为基于单总线协议的脉冲信号。由所述单总线协议的脉冲信号的指令控制的电源电路的电压输出以查找表的形式存储于所述电源电路中。
本公开的至少一个实施例提供的电源电压控制电路、方法、驱动集成电路和显示装置，通过电压检测单元检测显示面板实际接收到的电源电路的电源电压，根据该实际测得的电源电压与预先设定的基准电压的电压差值来控制电源电路输出至显示面板的电源电压，补偿电压传输过程中的压降损失，可以优化产品的显示效果，有效改善电源电路的输出端到显示面板端的压降损失，保证显示面板端输入电压的一致性。
附图说明
图1是本公开实施例提供的显示面板的电源电压控制电路的结构框图；
图2是本公开另一实施例提供的显示面板的电源电压控制电路的结构框图；
图3是本公开又一实施例提供的显示面板的电源电压控制电路的结构框图；
图4A是本公开实施例提供的显示面板的电源电压控制电路中的比较单元包括的第一比较模块的电路图；
图4B是本公开实施例提供的显示面板的电源电压控制电路中的比较单元包括的第二比较模块的电路图；
图5A是本公开实施例提供的显示面板的电源电压控制电路中的比较单元包括的第一放大模块的电路图；
图5B是本公开实施例提供的显示面板的电源电压控制电路中的比较单元包括的第二放大模块的电路图；
图6A是本公开实施例提供的显示面板的电源电压控制方法的流程图；
图6B是本公开另一实施例提供的显示面板的电源电压控制方法的流程图；
图7是本公开实施例提供的显示面板的电源电压控制电路应用于OLED显示面板的结构示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
图1是本公开实施例提供的显示面板的电源电压控制电路的结构框图。如图1所示，本公开实施例提供的显示面板的电源电压控制电路包括：电压检测单元11，用于检测显示面板接收到的来自电源电路的电源电压；比较单元12，与所述电压检测单元11连接，用于通过比较获得所述电源电压与基准电压之间的电压差；以及，电源电压控制单元13，与所述比较单元12连接，用于根据所述电压差和所述基准电压向所述电源电路发送电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
所述显示面板接收到的电源电压是用于驱动该显示面板的驱动电压，在实际操作时，该电源电压可以包括正电源电压和负电源电压。
本公开实施例提供的显示面板的电源电压控制电路通过电压检测单元检测显示面板实际接收到的电源电路的电源电压，根据该实际测得的电源电压与预先设定的基准电压的电压差值来控制电源电路输出至显示面板的电源电压，补偿电压传输过程中的压降损失，可以优化产品的显示效果，有效改善电源电路的输出端到显示面板端的压降损失，保证显示面板端输入电压的一致性。
图2是本公开另一实施例提供的显示面板的电源电压控制电路的结构框图。在实施时，如图2所示，所述基准电压可以由基准源10提供。
所述比较单元12和所述电源电压控制单元13都与所述基准源10连接。
而预先设定基准电压的情况可以如下：例如，在显示面板出厂时已经将调整好的伽马电压烧录在驱动集成电路(IC)里，则可以将与该伽马电压对应的提供至显示面板的电源电压设定为基准电压。
然而，对基准电压的预先设定的规则也可以采用其他的方式，并不限于以上的设定规则，在此不再赘述。
图3是本公开又一实施例提供的显示面板的电源电压控制电路的结构框图。例如，如图3所示，本公开实施例所述的电源电压控制电路还包括：放大单元14，分别与所述比较单元12和所述电源电压控制单元13连接，用于对来自所述比较单元12的电压差进行放大，并将放大后的电压差发送至所述电源电压控制单元13。
通过所述放大单元14对来自所述比较单元12的电压差进行放大可以更加准确地进行电源电压补偿。
在实施时，所述电源电压控制信号可以为基于单总线(single wire)协议的脉冲信号，所述电源电路向所述显示面板输出的电源电压的大小与所述脉冲信号的脉冲个数对应。
在本公开提供的电源电压控制电路的一实施例中，所述电源电压包括正电源电压和负电源电压。
所述基准电压包括第一基准电压和第二基准电压。
所述电压检测单元，用于检测显示面板接收到的来自电源电路的正电源电压和负电源电压。
所述比较单元，用于通过比较获得所述正电源电压与所述第一基准电压之间的第一电压差，并通过比较获得所述负电源电压与所述第二基准电压之间的第二电压差。
所述电源电压控制单元，用于根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的正电源电压，还用于根据所述第二电压差和所述第二基准电压向所述电源电路发送第二电源电压控制信号，以使得所述电源电路向所 述显示面板输出相应的负电源电压。
本公开提供的电源电压控制电路的该实施例针对提供给显示面板的电源电压包括正电源电压和负电源电压的情况，通过电源检测单元、比较单元和电源电压控制单元分别对该正电源电压、该负电源电压进行检测、比较和生成电源电压控制信号操作，以使得本公开提供的电源电压控制电路的该实施例可以同时对正电源电压和负电源电压进行补偿。
例如，当本公开实施例提供的电源电压控制电路包括放大单元时，所述放大单元用于分别对来自所述比较单元的第一电压差和第二电压差进行放大，并将放大后的第一电压差和放大后的第二电压差发送至所述电源电压控制单元。
例如，所述比较单元包括第一比较模块和第二比较模块。图4A是本公开实施例提供的显示面板的电源电压控制电路中的比较单元包括的第一比较模块的电路图，图4B是本公开实施例提供的显示面板的电源电压控制电路中的比较单元包括的第二比较模块的电路图。
如图4A所示，所述第一比较模块包括第一运算放大器OP1、第一电阻R1、第二电阻R2、第三电阻R3和第四电阻R4。
所述第一运算放大器OP1，同相输入端通过所述第四电阻R4接入电压检测单元(图4A中未示)检测到的显示面板接收到的来自电源电路的正电源电压ELVDD1，反相输入端通过所述第一电阻R1接入第一基准电压VF1，输出端通过所述第三电阻R3与所述第一运算放大器OP1的同相输入端连接。
所述第一运算放大器OP1的反相输入端还通过所述第二电阻R2接地。
所述第一运算放大器OP1通过其输出端输出第一电压差△V1。
所述第一运算放大器OP1的同相输入端的电位为V1，所述第一运算放大器OP1的反相输入端的电位为V2。
如图4A所示的第一比较模块对电压检测单元(图4A中未示)检测到的显示面板接收到的来自电源电路的正电源电压ELVDD1和第一基准电压VF1进行比较。
根据运算放大器虚短的原理：V1＝V2；根据运算放大器虚断的原理：IR1＝IR2，IR3＝IR4，可以推导出△V1＝VF1-ELVDD1。
其中IR1是流过R1的电流，IR2是流过R2的电流，IR3是流过R3的电流， IR4是流过R4的电流。
如图4B所示，所述第二比较模块包括第二运算放大器OP2、第五电阻R5、第六电阻R6、第七电阻R7和第八电阻R8。
所述第二运算放大器OP2，同相输入端通过所述第八电阻R8接入电压检测单元(图4A中未示)检测到的显示面板接收到的来自电源电路的负电源电压ELVSS1，反相输入端通过所述第五电阻R5接入第二基准电压VF2，输出端通过所述第七电阻R7与所述第二运算放大器OP2的同相输入端连接。
所述第二运算放大器OP2的反相输入端还通过所述第六电阻R6接地。
所述第二运算放大器OP2通过其输出端输出第二电压差△V2。
所述第二运算放大器OP2的同相输入端的电位为V3，所述第二运算放大器OP2的反相输入端的电位为V4。
如图4B所示的第二比较模块对电压检测单元(图4B中未示)检测到的显示面板接收到的来自电源电路的负电源电压ELVSS1和第二基准电压VF2进行比较。
根据运算放大器虚短的原理：V3＝V4；根据运算放大器虚断的原理：IR5＝IR6，IR7＝IR8，可以推导出△V2＝VF2-ELVSS1。
其中IR5是流过R5的电流，IR6是流过R6的电流，IR7是流过R7的电流，IR8是流过R8的电流。
例如，所述放大单元包括第一放大模块和第二放大模块。图5A是本公开实施例提供的显示面板的电源电压控制电路中的比较单元包括的第一放大模块的电路图，图5B是本公开实施例提供的显示面板的电源电压控制电路中的比较单元包括的第二放大模块的电路图。
如图5A所示，所述第一放大模块包括第三运算放大器OP3、第九电阻R9和第十电阻R10。
所述第三运算放大器OP3，同相输入端与所述第一运算放大器OP1(图5A中未示出OP1)的输出端连接(即OP3的同相输入端的电位V5即为第一电压差△V1)，反相输入端通过所述第十电阻R10接地，输出端通过所述第九电阻R9与所述第三运算放大器OP3的反相输入端连接。
所述第三运算放大器OP3的反相输入端的电位为V6。
所述第三运算放大器OP3通过其输出端输出放大后的第一电压差△ AV1。
根据运算放大器虚短的原理：V5＝V6；根据运算放大器虚断的原理：IR9＝IR10，可以推导出△AV1＝V5×(R9+R10)/R10。
其中IR9是流过R9的电流，IR10是流过R10的电流。
如图5B所示，所述第二放大模块包括第四运算放大器OP4、第十一电阻R11和第十二电阻R12。
所述第四运算放大器OP4，同相输入端与所述第二运算放大器OP2(图5B中未示出OP2)的输出端连接(即OP4的同相输入端的电位V7即为第二电压差△V2)，反相输入端通过所述第十二电阻R12接地，输出端通过所述第十一电阻R11与所述第四运算放大器OP4的反相输入端连接。
所述第四运算放大器OP4的反相输入端的电位为V8。
所述第四运算放大器OP4通过其输出端输出放大后的第二电压差△AV2。
根据运算放大器虚短的原理：V7＝V8；根据运算放大器虚断的原理：IR11＝IR12，可以推导出△AV2＝V7×(R11+R12)/R12。
其中IR11是流过R11的电流，IR12是流过R12的电流。
例如，所述电源电压控制单元包括第一电压控制模块和第二电压控制模块。
所述第一电压控制模块用于根据所述放大后的第一电压差和所述第一基准电压生成第一电源电压控制信号，并将该第一电源电压控制信号发送至所述电源电路，以使得所述电源电路根据该第一电源电压控制信号输出正电源电压；所述第一电源电压控制信号为基于单总线协议的脉冲信号；所述电源电路向所述显示面板输出的正电源电压的大小与所述第一电源电压控制信号的脉冲个数对应。
所述第二电压控制模块用于根据所述放大后的第二电压差和所述第二基准电压生成第二电源电压控制信号，并将该第二电源电压控制信号发送至所述电源电路，以使得所述电源电路根据该第二电源电压控制信号输出负电源电压；所述第二电源电压控制信号为基于单总线协议的脉冲信号；所述电源电路向所述显示面板输出的负电源电压的大小与所述第二电源电压控制信号的脉冲个数对应。
本公开实施例提供的电源电压控制电路针对电源电压包括正电源电压和负电源电压的情况，采用第一电压控制模块、第二电压控制模块来分别生成第一电源电压控制信号、第二电源电压控制信号，以分别调节电源电路输出的正电源电压、负电源电压。
例如，图5A中示出的第三运算放大器OP3输出的放大后的第一电压差△AV1为数字信号，图5B中示出的第四运算放大器OP4输出的放大后的第二电压差△AV2为数字信号。
所述第一电压控制模块需要先对该放大后的第一电压差△AV1进行数模转换，然后对该放大后的第一电压差△AV1进行处理以使得其精度与所述第一基准电压的精度相同。
所述第二电压控制模块需要先对该放大后的第二电压差△AV2进行数模转换，然后对该放大后的第二电压差△AV2进行处理以使得其精度与所述第二基准电压的精度相同。
在实施时，所述电源电压也可以仅包括一个电源电压，即所述电源电压包括正电源电压或负电源电压。所述基准电压包括第一基准电压。所述比较单元，用于通过比较获得所述电源电压与所述第一基准电压之间的第一电压差。所述电源电压控制单元，用于根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
在实际操作时，从成本上考虑可以仅针对对数据电压Vdata影响较大的一个电源电压(正电源电压VDD或负电源电压VSS)进行校正，这样既可以在一定程度上补偿电压传输过程中的压降损失，可以优化产品的显示效果，又可以不占用太多资源。
例如，当本公开实施例提供的电源电压控制电路包括放大单元时，所述放大单元用于对来自所述比较单元的第一电压差进行放大，并将放大后的第一电压差发送至所述电源电压控制单元。
例如，当所述电源电压包括正电源电压或负电源电压时，所述比较单元包括第一比较模块。
所述第一比较模块包括第一运算放大器、第一电阻、第二电阻、第三电阻和第四电阻。
所述第一运算放大器，同相输入端通过所述第四电阻接入所述正电源电压或负电源电压，反相输入端通过所述第一电阻接入所述第一基准电压，输出端通过所述第三电阻与所述第一运算放大器的同相输入端连接。
所述第一运算放大器的反相输入端还通过所述第二电阻接地。
所述第一运算放大器通过其输出端输出所述第一电压差。
例如，所述电源电压包括正电源电压或负电源电压，所述放大单元包括第一放大模块。
所述第一放大模块包括第二运算放大器、第五电阻和第六电阻。
所述第二运算放大器，同相输入端与所述第一运算放大器的输出端连接，反相输入端通过所述第六电阻接地，输出端通过所述第五电阻与所述第二运算放大器的反相输入端连接。
所述第二运算放大器通过其输出端输出放大后的第一电压差。
例如，所述电源电压包括正电源电压或负电源电压时，所述电源电压控制单元包括第一电压控制模块。
所述第一电压控制模块用于根据所述放大后的第一电压差和所述第一基准电压生成第一电源电压控制信号，并将该第一电源电压控制信号发送至所述电源电路，以使得所述电源电路根据该第一电源电压控制信号输出正电源电压或负电源电压；所述第一电源电压控制信号为基于单总线协议的脉冲信号。
例如，所述第二运算放大器输出的放大后的第一电压差为数字信号。
所述第一电压控制模块还用于对该放大后的第一电压差进行数模转换，并对该放大后的第一电压差进行处理以使得其精度与所述第一基准电压的精度相同。
本公开实施例还提供电源电压控制方法，应用于上述的电源电压控制电路。
图6A是本公开实施例提供的显示面板的电源电压控制方法的流程图。如图6A所示，所述电源电压控制方法包括以下步骤。
电压检测步骤61：电压检测单元检测显示面板接收到的来自电源电路的电源电压。
比较步骤62：比较单元通过比较获得的所述电源电压与基准电压之间的 电压差。
电源电压控制步骤63：电源电压控制单元根据所述电压差和所述基准电压向所述电源电路发送电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
本公开实施例所述的显示面板的电源电压控制方法通过电压检测单元检测显示面板实际接收到的电源电路的电源电压，根据该实际测得的电源电压与预先设定的基准电压的电压差值来控制电源电路输出至显示面板的电源电压，补偿电压传输过程中的压降损失，可以优化产品的显示效果，有效改善电源电路的输出端到显示面板端的压降损失，保证显示面板端输入电压的一致性。
图6B是本公开另一实施例提供的显示面板的电源电压控制方法的流程图。如图6A所示，该方法与图6A所示方法的区别在于，在所述比较步骤62和电源电压控制步骤63之间还包括放大步骤60：放大单元对来自所述比较单元的电压差进行放大，并将放大后的电压差发送至所述电源电压控制单元。
通过所述放大单元对来自所述比较单元12的电压差进行放大可以更加准确的进行电源电压补偿。
例如，所述电源电压控制信号为基于单总线协议的脉冲信号，所述电源电路向所述显示面板输出的电源电压的大小与所述脉冲信号的脉冲个数对应。
例如，所述电源电压包括正电源电压和负电源电压。
所述基准电压包括第一基准电压和第二基准电压。
所述电压检测步骤包括：所述电压检测单元检测显示面板接收到的来自电源电路的正电源电压和负电源电压。
所述比较步骤包括：所述比较单元通过比较获得所述正电源电压与所述第一基准电压之间的第一电压差，并通过比较获得所述负电源电压与所述第二基准电压之间的第二电压差。
所述电源电压控制步骤包括：所述电源电压控制单元根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的正电源电压，还用于根据所述第二 电压差和所述第二基准电压向所述电源电路发送第二电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的负电源电压。
例如，所述电源电压包括正电源电压或负电源电压。
所述基准电压包括第一基准电压。
所述比较步骤包括：所述比较单元通过比较获得所述电源电压与所述第一基准电压之间的第一电压差。
所述电源电压控制步骤包括：所述电源电压控制单元根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
本公开实施例还提供一种驱动集成电路，包括上述的电源电压控制电路。
本公开实施例还提供一种显示装置，包括显示面板、电源电路和上述的驱动集成电路。
所述驱动集成电路包括的电源电压控制电路，用于检测所述显示面板接收到的来自所述电源电路的电源电压，并根据所述电源电压与基准电压之间的电压差向所述电源电路发送电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
在实施时，所述电源电压控制信号可以为基于单总线协议的脉冲信号。
由所述基于单总线协议的脉冲信号的指令控制的电源电路的电压输出以查找表的形式存储于所述电源电路中，以便可以方便快速地根据该查找表确定电源电路需输出的电压。
下面以对OLED显示面板的电源电压控制为例来进行说明。在实施时本公开提供的显示面板的电源电压控制电路和方法不限于应用于OLED显示面板，也可以应用于液晶显示面板或已知的任何一种类型的显示面板。
在OLED显示装置中，电源电路设置于主板上，电源电压控制电路设置于驱动集成电路(Driver IC)上。
首先外部信号源提供信号给主板，电源电路开始工作并输出两路电压：正电源电压(即驱动OLED显示面板的正驱动电压)ELVDD和负电源电压(即驱动OLED显示面板的负驱动电压)ELVSS，该两路电压经过FPC进入OLED显示面板，同时该两路电压也进入Driver IC上设置的电源电压控制电路包括的电压检测单元，经过比较、放大和电源电压控制单元的处理之 后，Driver IC会判断出需要补偿的电压值，通过s-wire信号(所述s-wire信号即单脉冲信号形式的电源电压控制信号)，控制电源电路的电压输出，其中s-wire信号的指令控制的电压输出会以查找表的形式存储在电源电路中。
图7是本公开实施例提供的显示面板的电源电压控制电路应用于OLED显示面板的结构示意图。如图7所示，驱动集成电路71上设置的电源电压控制电路包括的第一电压检测模块701检测OLED显示面板72实际接收到的正电源电压，并通过第一比较模块702将该正电源电压与第一基准源703输出的第一基准电压进行比较，得到第一电压差，并通过第一放大模块704对该第一电压差进行放大，将放大后的第一电压差输出至第一电压控制模块705，所述第一电压控制模块705对放大后的第一电压差进行处理，以得到与所述第一基准源703输出的第一基准电压相同的精度，而后加上该第一基准电压，得到一新的正电源电压，通过查找表确定该电压值对应的s-wire信号脉冲的数量，会回馈给电源电路73，控制电源电路73输出新的正电源电压。
驱动集成电路71上设置的电源电压控制电路包括的第二电压检测模块706检测OLED显示面板72实际接收到的负电源电压，并通过第二比较模块707将该负电源电压与第二基准源708输出的第二基准电压进行比较，得到第二电压差，并通过第二放大模块709对该第二电压差进行放大，将放大后的第二电压差输出至第二电压控制模块710，所述第二电压控制模块710对放大后的第二电压差进行处理，以得到与所述第二基准源708输出的第二基准电压相同的精度，而后加上该第二基准电压，得到一新的负电源电压，通过查找表确定该电压值对应的s-wire信号脉冲的数量，会回馈给电源电路73，控制电源电路73输出新的负电源电压。
在图7中，Vin是电源电路73的输入电压信号，s-wire信号通过触动电源电路的软启动开关而控制电源电压输出相应的电源电压。在OLED显示面板72中，标示为DTFT的为驱动晶体管，标示为OLED的为有机发光二极管。
在已知的显示装置中，s-wire信号仅与数据线输出的数据电压Vdata有关，而本公开使得s-wire信号还与实际检测得到的电源电压和预先设定的基准电压有关。根据图像的实际情况，每一帧都会对数据电压Vdata进行判断，并输出一组s-wire信号，用来控制电源电路输出电压的大小。往往实际情况 中，同样一幅图片基本不会出现只显示一帧的情况，那么第一帧的时候主要是记录基准源和进行显示面板端实际电源电压的测试，从下一帧开始再进行电源电路输出的电源电压的校正，这样对显示面板的显示效果基本不会造成影响。
以上所述是本公开的示例实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。
本申请要求于2016年1月4日递交的中国专利申请第201610006334.9号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (23)

  1. 一种显示面板的电源电压控制电路，包括：
    电压检测单元，用于检测显示面板接收到的来自电源电路的电源电压；
    比较单元，用于通过比较获得所述电源电压与基准电压之间的电压差；以及，
    电源电压控制单元，用于根据所述电压差和所述基准电压向所述电源电路发送电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
  2. 如权利要求1所述的电源电压控制电路，还包括：
    放大单元，用于对来自所述比较单元的电压差进行放大，并将放大后的电压差发送至所述电源电压控制单元。
  3. 如权利要求1或2所述的电源电压控制电路，其中，所述电源电压控制信号为基于单总线协议的脉冲信号，所述电源电路向所述显示面板输出的电源电压的大小与所述脉冲信号的脉冲个数对应。
  4. 如权利要求1至3中任一权利要求所述的电源电压控制电路，其中，所述电源电压包括正电源电压和负电源电压；
    所述基准电压包括第一基准电压和第二基准电压；
    所述电压检测单元，用于检测显示面板接收到的来自电源电路的正电源电压和负电源电压；
    所述比较单元，用于通过比较获得所述正电源电压与所述第一基准电压之间的第一电压差，并通过比较获得所述负电源电压与所述第二基准电压之间的第二电压差；
    所述电源电压控制单元，用于根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的正电源电压，还用于根据所述第二电压差和所述第二基准电压向所述电源电路发送第二电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的负电源电压。
  5. 如权利要求4所述的电源电压控制电路，其中，所述放大单元，用于分别对来自所述比较单元的第一电压差和第二电压差进行放大，并将放大后 的第一电压差和放大后的第二电压差发送至所述电源电压控制单元。
  6. 如权利要求5所述的电源电压控制电路，其中，所述比较单元包括第一比较模块和第二比较模块；
    所述第一比较模块包括第一运算放大器、第一电阻、第二电阻、第三电阻和第四电阻；
    所述第一运算放大器，同相输入端通过所述第四电阻接入所述正电源电压，反相输入端通过所述第一电阻接入所述第一基准电压，输出端通过所述第三电阻与所述第一运算放大器的同相输入端连接；
    所述第一运算放大器的反相输入端还通过所述第二电阻接地；
    所述第一运算放大器通过其输出端输出所述第一电压差；
    所述第二比较模块包括第二运算放大器、第五电阻、第六电阻、第七电阻和第八电阻；
    所述第二运算放大器，同相输入端通过所述第八电阻接入所述负电源电压，反相输入端通过所述第五电阻接入所述第二基准电压，输出端通过所述第七电阻与所述第二运算放大器的同相输入端连接；
    所述第二运算放大器的反相输入端还通过所述第六电阻接地；
    所述第二运算放大器通过其输出端输出所述第二电压差。
  7. 如权利要求6所述的电源电压控制电路，其中，所述放大单元包括第一放大模块和第二放大模块；
    所述第一放大模块包括第三运算放大器、第九电阻和第十电阻；
    所述第三运算放大器，同相输入端与所述第一运算放大器的输出端连接，反相输入端通过所述第十电阻接地，输出端通过所述第九电阻与所述第三运算放大器的反相输入端连接；
    所述第三运算放大器通过其输出端输出放大后的第一电压差；
    所述第二放大模块包括第四运算放大器、第十一电阻和第十二电阻；
    所述第四运算放大器，同相输入端与所述第二运算放大器的输出端连接，反相输入端通过所述第十二电阻接地，输出端通过所述第十一电阻与所述第四运算放大器的反相输入端连接；
    所述第四运算放大器通过其输出端输出放大后的第二电压差。
  8. 如权利要求7所述的电源电压控制电路，其中，所述电源电压控制单 元包括第一电压控制模块和第二电压控制模块；
    所述第一电压控制模块用于根据所述放大后的第一电压差和所述第一基准电压生成第一电源电压控制信号，并将该第一电源电压控制信号发送至所述电源电路，以使得所述电源电路根据该第一电源电压控制信号输出正电源电压；所述第一电源电压控制信号为基于单总线协议的脉冲信号；
    所述第二电压控制模块用于根据所述放大后的第二电压差和所述第二基准电压生成第二电源电压控制信号，并将该第二电源电压控制信号发送至所述电源电路，以使得所述电源电路根据该第二电源电压控制信号输出负电源电压；所述第二电源电压控制信号为基于单总线协议的脉冲信号。
  9. 如权利要求8所述的电源电压控制电路，其中，所述第三运算放大器输出的放大后的第一电压差为数字信号，所述第四运算放大器输出的放大后的第二电压差为数字信号；
    所述第一电压控制模块还用于对该放大后的第一电压差进行数模转换，并对该放大后的第一电压差进行处理以使得其精度与所述第一基准电压的精度相同；
    所述第二电压控制模块还用于对该放大后的第二电压差进行数模转换，并对该放大后的第二电压差进行处理以使得其精度与所述第二基准电压的精度相同。
  10. 如权利要求1至3中任一权利要求所述的电源电压控制电路，其中，所述电源电压包括正电源电压或负电源电压；
    所述基准电压包括第一基准电压；
    所述比较单元，用于通过比较获得所述电源电压与所述第一基准电压之间的第一电压差；
    所述电源电压控制单元，用于根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
  11. 如权利要求10所述的电源电压控制电路，其中，所述放大单元用于对来自所述比较单元的第一电压差进行放大，并将放大后的第一电压差发送至所述电源电压控制单元。
  12. 如权利要求11所述的电源电压控制电路，其中，
    所述比较单元包括第一比较模块；
    所述第一比较模块包括第一运算放大器、第一电阻、第二电阻、第三电阻和第四电阻；
    所述第一运算放大器，同相输入端通过所述第四电阻接入所述正电源电压或负电源电压，反相输入端通过所述第一电阻接入所述第一基准电压，输出端通过所述第三电阻与所述第一运算放大器的同相输入端连接；
    所述第一运算放大器的反相输入端还通过所述第二电阻接地；
    所述第一运算放大器通过其输出端输出所述第一电压差。
  13. 如权利要求12所述的电源电压控制电路，其中，所述放大单元包括第一放大模块；
    所述第一放大模块包括第二运算放大器、第五电阻和第六电阻；
    所述第二运算放大器，同相输入端与所述第一运算放大器的输出端连接，反相输入端通过所述第六电阻接地，输出端通过所述第五电阻与所述第二运算放大器的反相输入端连接；
    所述第二运算放大器通过其输出端输出放大后的第一电压差。
  14. 如权利要求13所述的电源电压控制电路，其中，所述电源电压控制单元包括第一电压控制模块；
    所述第一电压控制模块用于根据所述放大后的第一电压差和所述第一基准电压生成第一电源电压控制信号，并将该第一电源电压控制信号发送至所述电源电路，以使得所述电源电路根据该第一电源电压控制信号输出正电源电压或负电源电压；所述第一电源电压控制信号为基于单总线协议的脉冲信号。
  15. 如权利要求14所述的电源电压控制电路，其中，所述第二运算放大器输出的放大后的第一电压差为数字信号；
    所述第一电压控制模块还用于对该放大后的第一电压差进行数模转换，并对该放大后的第一电压差进行处理以使得其精度与所述第一基准电压的精度相同。
  16. 一种电源电压控制方法，应用于如权利要求1至15中任一项所述的电源电压控制电路，所述电源电压控制方法包括：
    电压检测步骤：电压检测单元检测显示面板接收到的来自电源电路的电 源电压；
    比较步骤：比较单元通过比较获得所述电源电压与基准电压之间的电压差；
    电源电压控制步骤：电源电压控制单元根据所述电压差和所述基准电压向所述电源电路发送电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
  17. 如权利要求16所述的电源电压控制方法，其中，在所述比较步骤和电源电压步骤之间还包括：
    放大步骤：放大单元对来自所述比较单元的电压差进行放大，并将放大后的电压差发送至所述电源电压控制单元。
  18. 如权利要求16或17所述的电源电压控制方法，其中，所述电源电压控制信号为基于单总线协议的脉冲信号，所述电源电路向所述显示面板输出的电源电压的大小与所述脉冲信号的脉冲个数对应。
  19. 如权利要求16至18中任一权利要求所述的电源电压控制方法，其中，所述电源电压包括正电源电压和负电源电压；
    所述基准电压包括第一基准电压和第二基准电压；
    所述电压检测步骤包括：所述电压检测单元检测显示面板接收到的来自电源电路的正电源电压和负电源电压；
    所述比较步骤包括：所述比较单元通过比较获得所述正电源电压与所述第一基准电压之间的第一电压差，并通过比较获得所述负电源电压与所述第二基准电压之间的第二电压差；
    所述电源电压控制步骤包括：所述电源电压控制单元根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的正电源电压，还用于根据所述第二电压差和所述第二基准电压向所述电源电路发送第二电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的负电源电压。
  20. 如权利要求16至18中任一权利要求所述的电源电压控制方法，其中，所述电源电压包括正电源电压或负电源电压；
    所述基准电压包括第一基准电压；
    所述比较步骤包括：所述比较单元通过比较获得所述电源电压与所述第 一基准电压之间的第一电压差；
    所述电源电压控制步骤包括：所述电源电压控制单元根据所述第一电压差和所述第一基准电压向所述电源电路发送第一电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
  21. 一种驱动集成电路，包括如权利要求1至15中任一项所述的电源电压控制电路。
  22. 一种显示装置，包括显示面板、电源电路和如权利要求21所述的驱动集成电路；
    所述驱动集成电路包括的电源电压控制电路，用于检测所述显示面板接收到的来自所述电源电路的电源电压，并根据所述电源电压与基准电压之间的电压差向所述电源电路发送电源电压控制信号，以使得所述电源电路向所述显示面板输出相应的电源电压。
  23. 如权利要求22所述的显示装置，其中，所述电源电压控制信号为基于单总线协议的脉冲信号；
    由所述单总线协议的脉冲信号的指令控制的电源电路的电压输出以查找表的形式存储于所述电源电路中。
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