WO2016197409A1 - 用于amoled分区驱动的控制电路及控制方法 - Google Patents

用于amoled分区驱动的控制电路及控制方法 Download PDF

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Publication number
WO2016197409A1
WO2016197409A1 PCT/CN2015/082259 CN2015082259W WO2016197409A1 WO 2016197409 A1 WO2016197409 A1 WO 2016197409A1 CN 2015082259 W CN2015082259 W CN 2015082259W WO 2016197409 A1 WO2016197409 A1 WO 2016197409A1
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Prior art keywords
power supply
amoled
display
partition
film transistor
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PCT/CN2015/082259
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English (en)
French (fr)
Inventor
金羽锋
许神贤
周明忠
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深圳市华星光电技术有限公司
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Priority to US14/771,498 priority Critical patent/US20160379561A1/en
Publication of WO2016197409A1 publication Critical patent/WO2016197409A1/zh

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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]
    • 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
    • G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0408—Integration of the drivers onto the display substrate
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • 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

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a control circuit and a control method for AMOLED partition driving.
  • OLED Organic Light Emitting Display
  • OLED Organic Light Emitting Display
  • the OLED display device can be divided into two types: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED), namely direct addressing and thin film transistor (Thin Film Transistor, according to the driving method). TFT) matrix addressing two types.
  • the AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a high-definition large-sized display device.
  • AMOLED is a current-driven device.
  • the organic light-emitting diode emits light, and the luminance of the light is determined by the current flowing through the organic light-emitting diode itself, so it is essential for the driving of the AMOLED, which is related to the display of the AMOLED. Effect and longevity.
  • the conventional AMOLED pixel driving circuit is usually 2T1C, that is, a structure in which two thin film transistors are added with one capacitor.
  • the conventional AMOLED pixel driving circuit includes a first thin film transistor T1, a second thin film transistor T2, and a capacitor C1.
  • the first thin film transistor T1 is a switching thin film transistor, and the second thin film transistor T2 is driven.
  • a thin film transistor, the capacitor C1 being a storage capacitor.
  • the gate of the first thin film transistor T1 is electrically connected to the scan signal Scan, the source is electrically connected to the data signal Data, and the drain is electrically connected to the gate of the second thin film transistor T2 and one end of the capacitor C1;
  • the drain of the second thin film transistor T2 is directly electrically connected to the positive power supply line OVDD, the source is electrically connected to the anode of the organic light emitting diode D; the cathode of the organic light emitting diode D is directly electrically connected to the negative power supply line OVSS;
  • One end of the capacitor C1 is electrically connected to the drain of the first thin film transistor T1 and the gate of the second thin film transistor T2, and the other end is electrically connected to the drain of the second thin film transistor T2.
  • the scan signal Scan controls the first thin film transistor T1 to be turned on, and the data signal Data enters through the first thin film transistor T1. Go to the gate of the second thin film transistor T2 and the capacitor C1, and then the first thin film transistor T1 is turned off. Due to the storage of the capacitor C1, the gate voltage of the second thin film transistor T2 can continue to maintain the data signal voltage, so that the second film The transistor T2 is in an on state, and the driving current enters the organic light emitting diode D through the second thin film transistor T2 to drive the organic light emitting diode D to emit light, that is, the second thin film transistor T2 is responsible for controlling the voltage across the organic light emitting diode D and the current.
  • the object of the present invention is to provide a control circuit for AMOLED partition driving, which can ensure the display effect when the AMOLED displays black or dark images, eliminate the stress between the cathode and the anode of the organic light emitting diode, and improve the life of the AMOLED. And does not increase the difficulty of the process of AMOLED.
  • the object of the present invention is to provide a control method for AMOLED partition driving, which can ensure the display effect when the AMOLED displays black or dark images, eliminate the stress between the cathode and the anode of the organic light emitting diode, and improve the AMOLED. life.
  • control circuit for AMOLED partition driving comprising:
  • An AMOLED display panel is divided into a plurality of display partitions arranged in an array, each display partition includes a plurality of sub-pixels, each sub-pixel has a pixel driving circuit;
  • a power supply disposed outside the AMOLED display panel, a positive power supply connecting the positive pole of the power supply, and a negative power supply connecting the negative pole of the power supply;
  • a plurality of first pins and second pins equal to the number of the plurality of display partitions, wherein the pixel driving circuit in each display partition is connected to the positive power supply line via a first pin, and is connected to the power supply via a second pin Negative wiring;
  • each external switch correspondingly connected with a first pin and a positive power supply line, or each external switch correspondingly connected with a second lead The foot and the negative pole of the power supply;
  • an external timing controller that provides a control signal to each external switch to control the closing or opening of each external switch to control the image in each display zone
  • the drive circuit is turned on or off from the power supply.
  • the external switch is an NMOS transistor or a PMOS transistor.
  • the gate of the NMOS transistor or the PMOS transistor is connected to a control signal provided by an external timing controller.
  • the source is connected to the positive power supply of the power supply, and the drain is connected to the first pin.
  • the external switch is an NMOS transistor or a PMOS transistor.
  • the gate of the NMOS transistor or the PMOS transistor is connected to a control signal provided by an external timing controller.
  • the source is connected to the negative polarity of the power supply and the drain is connected to the second pin.
  • the external timing controller matches the dynamic partition brightness adjustment algorithm or the pulse width modulation algorithm to provide a control signal to each external switch.
  • the pixel driving circuit includes a first film transistor, a second thin film transistor, and a capacitor; a gate of the first thin film transistor is electrically connected to the scan signal, a source is electrically connected to the data signal, and the drain and the second thin film transistor are The gate and the one end of the capacitor are electrically connected; the drain of the second thin film transistor is connected to the first pin, the source is electrically connected to the anode of the organic light emitting diode; and the cathode of the organic light emitting diode is connected The second pin is electrically connected to the drain of the first thin film transistor and the gate of the second thin film transistor, and the other end is electrically connected to the drain of the second thin film transistor.
  • the invention also provides a control circuit for AMOLED partition driving, comprising:
  • An AMOLED display panel is divided into a plurality of display partitions arranged in an array, each display partition includes a plurality of sub-pixels, each sub-pixel has a pixel driving circuit;
  • a power supply disposed outside the AMOLED display panel, a positive power supply connecting the positive pole of the power supply, and a negative power supply connecting the negative pole of the power supply;
  • a plurality of first pins and second pins equal to the number of the plurality of display partitions, wherein the pixel driving circuit in each display partition is connected to the positive power supply line via a first pin, and is connected to the power supply via a second pin Negative wiring;
  • each external switch correspondingly connected with a first pin and a positive power supply line, or each external switch correspondingly connected with a second lead The foot and the negative pole of the power supply;
  • an external timing controller that provides a control signal to each external switch to control the closing or opening of each external switch, thereby controlling the conduction of the pixel driving circuit and the power source in each display zone or disconnect;
  • the external switch is an NMOS transistor or a PMOS transistor, and a gate of the NMOS transistor or the PMOS transistor is connected to a control signal provided by an external timing controller, the source is connected to the positive polarity of the power supply, and the drain is connected to the first lead Feet
  • the external timing controller matches a dynamic partition brightness adjustment algorithm or a pulse width modulation algorithm to provide a control signal to each external switch;
  • the pixel driving circuit includes a first film transistor, a second thin film transistor, and a capacitor; a gate of the first thin film transistor is electrically connected to the scan signal, a source is electrically connected to the data signal, and the drain and the second film are electrically connected. a gate of the transistor and one end of the capacitor are electrically connected; a drain of the second thin film transistor is connected to the first pin, a source is electrically connected to an anode of the organic light emitting diode; and an organic light emitting diode is The cathode is connected to the second lead; one end of the capacitor is electrically connected to the drain of the first thin film transistor and the gate of the second thin film transistor, and the other end is electrically connected to the drain of the second thin film transistor.
  • the invention also provides a control method for AMOLED partition driving, comprising the following steps:
  • Step 1 Providing a control circuit for the AMOLED partition drive
  • the control circuit for the AMOLED partition drive includes:
  • An AMOLED display panel is divided into a plurality of display partitions arranged in an array, each display partition includes a plurality of sub-pixels, each sub-pixel has a pixel driving circuit;
  • a power supply disposed outside the AMOLED display panel, a positive power supply connecting the positive pole of the power supply, and a negative power supply connecting the negative pole of the power supply;
  • a plurality of first pins and second pins equal to the number of the plurality of display partitions, wherein the pixel driving circuit in each display partition is connected to the positive power supply line via a first pin, and is connected to the power supply via a second pin Negative wiring;
  • each external switch correspondingly connected with a first pin and a positive power supply line, or each external switch correspondingly connected with a second lead The foot and the negative pole of the power supply;
  • Step 2 displaying, by each display partition of the AMOLED display panel, the external timing controller provides a control signal to each external switch according to the brightness and darkness of each display partition display screen, and controls a dark or black display screen.
  • the external switch corresponding to the display partition is disconnected, so that the pixel drive circuit in the display partition where the darker or black display screen is located is disconnected from the power source.
  • the external timing controller matches the dynamic partition brightness adjustment algorithm or the pulse width modulation algorithm to provide a control signal to each external switch.
  • the external switch is an NMOS transistor or a PMOS transistor, and the gate of the NMOS transistor or the PMOS transistor is connected to a control signal provided by an external timing controller, and the source is connected to the positive polarity of the power supply, and the drain is connected.
  • the pole is connected to the first pin.
  • the external switch is an NMOS transistor or a PMOS transistor.
  • the gate of the NMOS transistor or the PMOS transistor is connected to a control signal provided by an external timing controller.
  • the source is connected to the negative polarity of the power supply and the drain is connected to the second pin.
  • the pixel driving circuit includes a first film transistor, a second thin film transistor, and a capacitor; a gate of the first thin film transistor is electrically connected to the scan signal, a source is electrically connected to the data signal, and the drain and the second thin film transistor are The gate and the one end of the capacitor are electrically connected; the drain of the second thin film transistor is connected to the first pin, the source is electrically connected to the anode of the organic light emitting diode; and the cathode of the organic light emitting diode is connected The second pin is electrically connected to the drain of the first thin film transistor and the gate of the second thin film transistor, and the other end is electrically connected to the drain of the second thin film transistor.
  • the present invention provides a control circuit and method for AMOLED partition driving, which divides an AMOLED display panel into a plurality of display partitions, and sets a plurality of first pins equal to the number of the plurality of display partitions.
  • the second pin, the pixel driving circuit in each display partition is connected to the positive power supply trace via a first pin, connected to the negative power supply trace via a second pin, and disposed and displayed outside the AMOLED display panel
  • a plurality of external switches having the same number of partitions, each external switch correspondingly connected with a first pin and a positive power supply trace, or each external switch correspondingly connected with a second pin and a negative power supply lead through an external timing controller Providing a control signal to each external switch to control the external switch corresponding to the display partition where the darker or black display is located, so that the pixel drive circuit in the display partition where the darker or black display is located is disconnected from the power supply. , can ensure the display effect, can eliminate the stress between the cathode and the anode of the organic light-emitting diode, improve the life of the AMOLED, and does not increase the AMOL The difficulty of the ED process.
  • FIG. 1 is a circuit diagram of a conventional AMOLED pixel driving circuit
  • FIG. 2 is a circuit diagram of a control circuit for AMOLED partition driving according to the present invention.
  • FIG. 3 is a circuit diagram of an AMOLED pixel driving circuit in a control circuit for AMOLED partition driving according to the present invention
  • FIG. 4 is a flow chart of a control method for AMOLED partition driving according to the present invention.
  • the present invention first provides a control circuit for AMOLED partition driving, including:
  • the AMOLED display panel 100 is divided into a plurality of display partitions arranged in an array, each display partition includes a plurality of sub-pixels, each sub-pixel has a pixel driving circuit 101; and the AMOLED display panel
  • the number of the partitioned display partitions is not limited, and can be determined according to actual display requirements. As shown in FIG. 2, the AMOLED display panel 100 is divided into 12 display partitions, which are display partition 1, display partition 2, respectively. Until the partition 12 is displayed;
  • a power supply (not shown) provided outside the AMOLED display panel 100, a positive power supply line OVDD connected to the positive pole of the power supply, and a negative power supply line OVSS connected to the negative pole of the power supply;
  • first pins PIN1 and second pins PIN2 equal to the number of the plurality of display partitions, and the pixel driving circuit 101 in each display partition is connected to the power source positive trace OVDD via a first pin PIN1, via a first
  • the two-pin PIN2 is connected to the negative power supply line OVSS; as shown in FIG. 2, there are 12 first pin PIN1 and 12 second pin PIN2;
  • a first pin PIN1 is connected to the power supply positive line OVDD
  • the external switch S1 is connected to the first pin PIN1 corresponding to the display partition 1 and the power positive line OVDD
  • the external switch S12 is connected to the first lead corresponding to the display partition 12.
  • the pin PIN1 is connected to the power supply positive line OVDD
  • FIG. 2 illustrates that the plurality of external switches are arranged on a side close to the power supply positive line OVDD, and of course, the plurality of external switches may be arranged close to the power supply negative line.
  • each external switch is connected to a second pin PIN2 and a negative power supply line OVSS;
  • an external timing controller TCON which provides a control signal to each external switch to control the closing or opening of each external switch, thereby controlling the pixel driving circuit 101 and the power supply in each display partition. Turn on or off.
  • the external switch can be an NMOS transistor, which is controlled by a high-potential signal and is controlled to be turned off by a low-potential signal; the external switch can also be a PMOS transistor, which is controlled by a low-potential signal, and is controlled by The control of the high potential signal is broken. Further, as shown in FIG.
  • the gate of the NMOS transistor or the PMOS transistor is connected to a control signal provided by an external timing controller TCON, and the source is Connected to the positive power supply line OVDD, the drain is connected to the first pin PIN1; or the gate of the NMOS or PMOS transistor is connected to the control signal provided by the external timing controller TCON, and the source is connected to the negative supply of the power supply OVSS, the drain is connected to the second pin PIN2.
  • the TFT is fabricated by the array process, and the process of the NMOS transistor or the PMOS transistor is performed outside the AMOLED display panel, the process process is less restricted, the process difficulty is low, and the yield is high, so the NMOS transistor or The PMOS tube acts as an external switch, making it easy to achieve a good switching effect.
  • the pixel driving circuit 101 includes a first film transistor T1, a second thin film transistor T2, and a capacitor C1; the gate of the first thin film transistor T1 is electrically connected to the scan signal Scan, and the source is electrically Connecting the data signal Data, the drain is electrically connected to the gate of the second thin film transistor T2 and one end of the capacitor C1; the drain of the second thin film transistor T2 is connected to the first pin PIN1, and the source is electrically Connecting the anode of the organic light-emitting diode D; the cathode of the organic light-emitting diode D is connected to the second pin PIN2; one end of the capacitor C1 is electrically connected to the drain of the first thin film transistor T1 and the second thin film transistor The gate of T2 is electrically connected to the drain of the second thin film transistor T2.
  • the external timing controller TCON provides a control signal to each external switch according to the brightness of each display partition display screen, and controls a dark or black display screen.
  • the external switch corresponding to the display partition is disconnected, so that the pixel driving circuit in the display partition where the dark or black display screen is located is disconnected from the power source, blocking leakage current, thereby ensuring display effect and eliminating organic light emission.
  • the stress between the cathode and the anode of the diode D increases the lifetime of the AMOLED.
  • the external timing controller TCON matches a dynamic partition brightness adjustment (Local Dimming) algorithm or a pulse width modulation algorithm (Pulse Width Modulation (PWM)) to provide a control signal to each external switch to ensure that the picture is not distorted, the Local Dimming algorithm or PWM algorithm has been applied to liquid crystal display, which belongs to the prior art and will not be described in detail here.
  • Local Dimming dynamic partition brightness adjustment
  • PWM pulse width modulation algorithm
  • the external timing controller TCON supplies a low potential control signal to the external switch S1, that is, the NMOS transistor, and the NMOS transistor is disconnected, so that the display partition 1 is displayed.
  • the connection between the pixel driving circuit 101 and the power supply positive line OVDD is disconnected, that is, the pixel driving circuit 101 in the display partition 1 is disconnected from the power source, and the leakage current is blocked, and the organic light emitting diode D in the display partition 1 is displayed.
  • the stress between the cathode and the anode is eliminated.
  • the present invention further provides a control method for an AMOLED partition drive, comprising the following steps:
  • Step 1 Provide a control circuit for the AMOLED partition drive.
  • control circuit for the AMOLED partition driving includes:
  • the AMOLED display panel 100 is divided into a plurality of display partitions arranged in an array, each display partition includes a plurality of sub-pixels, each sub-pixel has a pixel driving circuit 101; and the AMOLED display panel
  • the number of the partitioned display partitions is not limited, and can be determined according to actual display requirements. As shown in FIG. 2, the AMOLED display panel 100 is divided into 12 display partitions, which are display partition 1, display partition 2, respectively. Until the partition 12 is displayed;
  • a power supply (not shown) provided outside the AMOLED display panel 100, a positive power supply line OVDD connected to the positive pole of the power supply, and a negative power supply line OVSS connected to the negative pole of the power supply;
  • first pins PIN1 and second pins PIN2 equal to the number of the plurality of display partitions, and the pixel driving circuit 101 in each display partition is connected to the power source positive trace OVDD via a first pin PIN1, via a first
  • the two-pin PIN2 is connected to the negative power supply line OVSS; as shown in FIG. 2, there are 12 first pin PIN1 and 12 second pin PIN2;
  • a first pin PIN1 is connected to the power supply positive line OVDD
  • the external switch S1 is connected to the first pin PIN1 corresponding to the display partition 1 and the power positive line OVDD
  • the external switch S12 is connected to the first lead corresponding to the display partition 12.
  • the pin PIN1 is connected to the power supply positive line OVDD
  • FIG. 2 illustrates that the plurality of external switches are arranged on a side close to the power supply positive line OVDD, and of course, the plurality of external switches may be arranged close to the power supply negative line.
  • each external switch is connected to a second pin PIN2 and a negative power supply line OVSS;
  • the external switch can be an NMOS transistor, which is controlled by a high-potential signal and is controlled to be turned off by a low-potential signal; the external switch can also be a PMOS transistor, which is controlled by a low-potential signal, and is controlled by The control of the high potential signal is broken.
  • the gate of the NMOS transistor or the PMOS transistor is connected to a control signal provided by an external timing controller TCON, the source is connected to the power supply positive trace OVDD, and the drain is connected to the first pin.
  • the gate of the NMOS or PMOS transistor is connected to a control signal provided by an external timing controller TCON, the source is connected to the power supply negative line OVSS, and the drain is connected to the second pin PIN2.
  • TCON timing controller
  • the source is connected to the power supply negative line OVSS
  • the drain is connected to the second pin PIN2.
  • the TFT is fabricated by the array process, and the process of the NMOS transistor or the PMOS transistor is performed outside the AMOLED display panel, the process process is less restricted, the process difficulty is low, and the yield is high, so the NMOS transistor or The PMOS tube acts as an external switch, making it easy to achieve a good switching effect.
  • the pixel driving circuit 101 includes a first film transistor T1 and a second film.
  • the drain of the second thin film transistor T2 is connected to the first pin PIN1, the source is electrically connected to the anode of the organic light emitting diode D;
  • the cathode of the organic light emitting diode D is connected to the
  • the second pin PIN2 is electrically connected to the drain of the first thin film transistor T1 and the gate of the second thin film transistor T2, and the other end is electrically connected to the drain of the second thin film transistor T2.
  • Step 2 displaying, by each display partition of the AMOLED display panel 100, the external timing controller TCON provides a control signal to each external switch according to the brightness of each display partition display screen, and controls the dark or black The external switch corresponding to the display partition where the display screen is located is disconnected, so that the pixel drive circuit in the display partition where the darker or black display screen is located is disconnected from the power source.
  • the external timing controller TCON supplies a low potential control signal to the external switch S1, that is, the NMOS transistor, and the NMOS transistor is disconnected, so that the display partition 1 is displayed.
  • the connection between the pixel driving circuit 101 and the power supply positive line OVDD is disconnected, that is, the pixel driving circuit 101 in the display partition 1 is disconnected from the power source, and the leakage current is blocked, and the organic light emitting diode D in the display partition 1 is displayed.
  • the stress between the cathode and the anode is eliminated.
  • the external timing controller TCON matches the Local Dimming algorithm or the PWM algorithm to provide a control signal to each external switch to ensure that the picture is not distorted.
  • the above control method for the AMOLED partition drive controls the external switch corresponding to the display partition where the dark or black display screen is located by the control signal provided by the external timing controller TCON, so that the dark or black display screen is located.
  • the pixel driving circuit in the display partition is disconnected from the power source, and the leakage current is blocked, thereby ensuring the display effect, eliminating the stress between the cathode and the anode of the organic light-emitting diode D in the display partition, and improving the life of the AMOLED. .
  • control circuit and method for AMOLED partition driving of the present invention divides an AMOLED display panel into a plurality of display partitions, and sets a plurality of first pins and second leads equal to the number of the plurality of display partitions.
  • a pixel driving circuit in each display partition is connected to the positive power supply of the power supply via a first pin, connected to the negative power supply of the power supply via a second pin, and the number of display partitions is equal to the number of display partitions outside the AMOLED display panel.
  • each external switch correspondingly connected with a first pin and a positive power supply trace, or each external switch correspondingly connected with a second pin and a negative power supply trace, through an external timing controller to each external
  • the switch provides a control signal to control the external switch corresponding to the display partition where the dark or black display screen is located, so that the pixel drive circuit and the power supply in the display partition where the darker or black display screen is located Disconnection can not only ensure the display effect, but also eliminate the stress between the cathode and the anode of the organic light-emitting diode, improve the life of the AMOLED, and does not increase the difficulty of the process of the AMOLED.

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Abstract

一种用于AMOLED分区驱动的控制电路及控制方法，将AMOLED显示面板（100）划分为多个显示分区（1，2，3，4，5，6，7，8，9，10，11，12），设置与多个显示分区（1，2，3，4，5，6，7，8，9，10，11，12）的数量相等的多个第一引脚（PIN1）与第二引脚（PIN2），每一显示分区（1，2，3，4，5，6，7，8，9，10，11，12）内的像素驱动电路（101）经由第一引脚（PIN1）连接电源正极走线（OVDD），经由第二引脚（PIN2）连接电源负极走线（OVSS），且在AMOLED显示面板（100）外部设置与显示分区（1，2，3，4，5，6，7，8，9，10，11，12）的数量相等的多个外部开关，每一外部开关对应连接一个第一引脚（PIN1）与电源正极走线（OVDD），或每一外部开关对应连接一个第二引脚（PIN2）与电源负极走线（OVSS），通过外部时序控制器（TCON）向每一外部开关提供控制信号，能够在AMOLED显示黑色或较暗画面时，保证显示效果，消除有机发光二级管阴极和阳极之间的应力。

Description

用于AMOLED分区驱动的控制电路及控制方法 技术领域
本发明涉及显示技术领域，尤其涉及一种用于AMOLED分区驱动的控制电路及控制方法。
背景技术
有机发光二极管(Organic Light Emitting Display，OLED)显示装置具有自发光、驱动电压低、发光效率高、响应时间短、清晰度与对比度高、近180°视角、使用温度范围宽，可实现柔性显示与大面积全色显示等诸多优点，被业界公认为是最有发展潜力的显示装置。
OLED显示装置按照驱动方式可以分为无源矩阵型OLED(Passive Matrix OLED，PMOLED)和有源矩阵型OLED(Active Matrix OLED，AMOLED)两大类，即直接寻址和薄膜晶体管(Thin Film Transistor，TFT)矩阵寻址两类。其中，AMOLED具有呈阵列式排布的像素，属于主动显示类型，发光效能高，通常用作高清晰度的大尺寸显示装置。
随着AMOLED电视的兴起，人们对于AMOLED电视功能的需求也日益增长。AMOLED是电流驱动器件，当有电流流过有机发光二极管时，有机发光二极管发光，且发光亮度由流过有机发光二极管自身的电流决定，因此对AMOLED的驱动至关重要，它关系到AMOLED的显示效果以及寿命。
如图1所示，传统的AMOLED像素驱动电路通常为2T1C，即两个薄膜晶体管加一个电容的结构。具体地，传统的AMOLED像素驱动电路包括一第一薄膜晶体管T1、一第二薄膜晶体管T2、及一电容C1，所述第一薄膜晶体管T1为开关薄膜晶体管，所述第二薄膜晶体管T2为驱动薄膜晶体管，所述电容C1为存储电容。所述第一薄膜晶体管T1的栅极电性连接扫描信号Scan，源极电性连接数据信号Data，漏极与第二薄膜晶体管T2的栅极、及电容C1的一端电性连接；所述第二薄膜晶体管T2的漏极直接电性连接电源正极走线OVDD，源极电性连接有机发光二级管D的阳极；有机发光二级管D的阴极直接电性连接于电源负极走线OVSS；电容C1的一端电性连接第一薄膜晶体管T1的漏极及第二薄膜晶体管T2的栅极，另一端电性连接第二薄膜晶体管T2的漏极。AMOLED显示时，扫描信号Scan控制第一薄膜晶体管T1导通，数据信号Data经过第一薄膜晶体管T1进入 到第二薄膜晶体管T2的栅极及电容C1，然后第一薄膜晶体管T1断开，由于电容C1的存储作用，第二薄膜晶体管T2的栅极电压仍可继续保持数据信号电压，使得第二薄膜晶体管T2处于导通状态，驱动电流通过第二薄膜晶体管T2进入有机发光二级管D，驱动有机发光二级管D发光，即第二薄膜晶体管T2负责控制有机发光二极管D的跨压及电流。
上述传统的AMOLED的2T1C像素驱动电路在显示黑色画面时，虽然OLED的光近似黑色，但是由于在AMOLED显示面板上制作TFT的制程缺陷及不稳定，导致第二薄膜晶体管T2存在漏电流且比较难得到控制，在有机发光二极管D的阴极和阳极之间始终存在应力(stress)作用，这使得AMOLED的显示效果会出现变化，同时影响AMOLED的寿命。
发明内容
本发明的目的在于提供一种用于AMOLED分区驱动的控制电路，能够在AMOLED显示黑色或较暗画面时，保证显示效果，消除有机发光二级管阴极和阳极之间的应力，提高AMOLED的寿命，且不增加AMOLED的制程难度。
本发明的目的还在于提供一种用于AMOLED分区驱动的控制方法，能够在AMOLED显示黑色或较暗画面时，保证显示效果，消除有机发光二级管阴极和阳极之间的应力，提高AMOLED的寿命。
为实现上述目的，本发明提供了一种用于AMOLED分区驱动的控制电路，包括：
AMOLED显示面板，所述AMOLED显示面板被划分多个呈阵列式排布的显示分区，每一显示分区包括多个子像素，每一子像素具有一像素驱动电路；
设于所述AMOLED显示面板外部的电源、连接电源正极的电源正极走线、连接电源负极的电源负极走线；
与多个显示分区的数量相等的多个第一引脚与第二引脚，每一显示分区内的像素驱动电路经由一第一引脚连接电源正极走线，经由一第二引脚连接电源负极走线；
设于所述AMOLED显示面板外部，且与显示分区的数量相等的多个外部开关，每一外部开关对应连接一第一引脚与电源正极走线，或每一外部开关对应连接一第二引脚与电源负极走线；
以及一外部时序控制器，所述外部时序控制器向每一外部开关提供控制信号，控制每一外部开关的闭合或断开，从而控制每一显示分区内的像 素驱动电路与电源的导通或断开。
所述外部开关为NMOS管或PMOS管，所NMOS管或PMOS管的栅极接入由外部时序控制器提供的控制信号，源极连接于电源正极走线，漏极连接于第一引脚。
所述外部开关为NMOS管或PMOS管，所NMOS管或PMOS管的栅极接入由外部时序控制器提供的控制信号，源极连接于电源负极走线，漏极连接于第二引脚。
所述外部时序控制器匹配动态分区亮度调节算法或脉宽调制算法向每一外部开关提供控制信号。
所述像素驱动电路包括第一膜晶体管、第二薄膜晶体管、及电容；所述第一薄膜晶体管的栅极电性连接扫描信号，源极电性连接数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极连接于所述第一引脚，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极连接于所述第二引脚；所述电容的一端电性连接第一薄膜晶体管的漏极及第二薄膜晶体管的栅极，另一端电性连接第二薄膜晶体管的漏极。
本发明还提供一种用于AMOLED分区驱动的控制电路，包括：
AMOLED显示面板，所述AMOLED显示面板被划分多个呈阵列式排布的显示分区，每一显示分区包括多个子像素，每一子像素具有一像素驱动电路；
设于所述AMOLED显示面板外部的电源、连接电源正极的电源正极走线、连接电源负极的电源负极走线；
与多个显示分区的数量相等的多个第一引脚与第二引脚，每一显示分区内的像素驱动电路经由一第一引脚连接电源正极走线，经由一第二引脚连接电源负极走线；
设于所述AMOLED显示面板外部，且与显示分区的数量相等的多个外部开关，每一外部开关对应连接一第一引脚与电源正极走线，或每一外部开关对应连接一第二引脚与电源负极走线；
以及一外部时序控制器，所述外部时序控制器向每一外部开关提供控制信号，控制每一外部开关的闭合或断开，从而控制每一显示分区内的像素驱动电路与电源的导通或断开；
其中，所述外部开关为NMOS管或PMOS管，所NMOS管或PMOS管的栅极接入由外部时序控制器提供的控制信号，源极连接于电源正极走线，漏极连接于第一引脚；
其中，所述外部时序控制器匹配动态分区亮度调节算法或脉宽调制算法向每一外部开关提供控制信号；
其中，所述像素驱动电路包括第一膜晶体管、第二薄膜晶体管、及电容；所述第一薄膜晶体管的栅极电性连接扫描信号，源极电性连接数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极连接于所述第一引脚，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极连接于所述第二引脚；所述电容的一端电性连接第一薄膜晶体管的漏极及第二薄膜晶体管的栅极，另一端电性连接第二薄膜晶体管的漏极。
本发明还提供一种用于AMOLED分区驱动的控制方法，包括如下步骤：
步骤1、提供用于AMOLED分区驱动的控制电路；
所述用于AMOLED分区驱动的控制电路包括：
AMOLED显示面板，所述AMOLED显示面板被划分多个呈阵列式排布的显示分区，每一显示分区包括多个子像素，每一子像素具有一像素驱动电路；
设于所述AMOLED显示面板外部的电源、连接电源正极的电源正极走线、连接电源负极的电源负极走线；
与多个显示分区的数量相等的多个第一引脚与第二引脚，每一显示分区内的像素驱动电路经由一第一引脚连接电源正极走线，经由一第二引脚连接电源负极走线；
设于所述AMOLED显示面板外部，且与显示分区的数量相等的多个外部开关，每一外部开关对应连接一第一引脚与电源正极走线，或每一外部开关对应连接一第二引脚与电源负极走线；
以及一外部时序控制器；
步骤2、所述AMOLED显示面板的各个显示分区进行显示，所述外部时序控制器根据每一显示分区显示画面的明暗情况，向每一外部开关提供控制信号，控制较暗或呈黑色的显示画面所在显示分区所对应的外部开关断开，使得较暗或呈黑色的显示画面所在显示分区内的像素驱动电路与电源断开。
所述步骤2中，外部时序控制器匹配动态分区亮度调节算法或脉宽调制算法向每一外部开关提供控制信号。
所述外部开关为NMOS管或PMOS管，所NMOS管或PMOS管的栅极接入由外部时序控制器提供的控制信号，源极连接于电源正极走线，漏 极连接于第一引脚。
所述外部开关为NMOS管或PMOS管，所NMOS管或PMOS管的栅极接入由外部时序控制器提供的控制信号，源极连接于电源负极走线，漏极连接于第二引脚。
所述像素驱动电路包括第一膜晶体管、第二薄膜晶体管、及电容；所述第一薄膜晶体管的栅极电性连接扫描信号，源极电性连接数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极连接于所述第一引脚，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极连接于所述第二引脚；所述电容的一端电性连接第一薄膜晶体管的漏极及第二薄膜晶体管的栅极，另一端电性连接第二薄膜晶体管的漏极。
本发明的有益效果：本发明提供的一种用于AMOLED分区驱动的控制电路及方法，将AMOLED显示面板划分为多个显示分区，设置与多个显示分区的数量相等的多个第一引脚与第二引脚，每一显示分区内的像素驱动电路经由一第一引脚连接电源正极走线，经由一第二引脚连接电源负极走线，且在所述AMOLED显示面板外部设置与显示分区的数量相等的多个外部开关，每一外部开关对应连接一第一引脚与电源正极走线，或每一外部开关对应连接一第二引脚与电源负极走线，通过外部时序控制器向每一外部开关提供控制信号，控制较暗或呈黑色的显示画面所在显示分区所对应的外部开关断开，使得较暗或呈黑色的显示画面所在显示分区内的像素驱动电路与电源断开，既能保证显示效果，又能消除有机发光二级管阴极和阳极之间的应力，提高AMOLED的寿命，且不增加AMOLED的制程难度。
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其它有益效果显而易见。
附图中，
图1为传统的AMOLED像素驱动电路的电路图；
图2为本发明的用于AMOLED分区驱动的控制电路的电路图；
图3为本发明的用于AMOLED分区驱动的控制电路中AMOLED像素驱动电路的电路图；
图4为本发明的用于AMOLED分区驱动的控制方法的流程图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图2与图3，本发明首先提供一种用于AMOLED分区驱动的控制电路，包括：
AMOLED显示面板100，所述AMOLED显示面板100被划分多个呈阵列式排布的显示分区，每一显示分区包括多个子像素，每一子像素具有一像素驱动电路101；对所述AMOLED显示面板100划分显示分区的数量不限，可根据实际显示需求来确定，以图2所示为例，所述AMOLED显示面板100被划分成了12个显示分区，分别为显示分区1、显示分区2、直至显示分区12；
设于所述AMOLED显示面板100外部的电源(未图示)、连接电源正极的电源正极走线OVDD、连接电源负极的电源负极走线OVSS；
与多个显示分区的数量相等的多个第一引脚PIN1与第二引脚PIN2，每一显示分区内的像素驱动电路101经由一第一引脚PIN1连接电源正极走线OVDD，经由一第二引脚PIN2连接电源负极走线OVSS；以图2所示为例，设置有12个第一引脚PIN1与12个第二引脚PIN2；
设于所述AMOLED显示面板100外部，且与显示分区的数量相等的多个外部开关，以图2所示为例，设置有12个外部开关S1、S2、直至S12，将每一外部开关对应连接一第一引脚PIN1与电源正极走线OVDD，如外部开关S1连接对应于显示分区1的第一引脚PIN1与电源正极走线OVDD，外部开关S12连接对应于显示分区12的第一引脚PIN1与电源正极走线OVDD；图2示意出了将所述多个外部开关布置于靠近电源正极走线OVDD的一侧，当然也可以将所述多个外部开关布置于靠近电源负极走线OVSS的一侧，每一外部开关对应连接一第二引脚PIN2与电源负极走线OVSS；
以及一外部时序控制器TCON，所述外部时序控制器TCON向每一外部开关提供控制信号，控制每一外部开关的闭合或断开，从而控制每一显示分区内的像素驱动电路101与电源的导通或断开。
具体地，所述外部开关可为NMOS管，受高电位信号的控制导通，受低电位信号的控制断开；所述外部开关也可为PMOS管，受低电位信号的控制导通，受高电位信号的控制断开。进一步地，如图2所示，所述NMOS管或PMOS管的栅极接入由外部时序控制器TCON提供的控制信号，源极 连接于电源正极走线OVDD，漏极连接于第一引脚PIN1；或者所述NMOS管或PMOS管的栅极接入由外部时序控制器TCON提供的控制信号，源极连接于电源负极走线OVSS，漏极连接于第二引脚PIN2。不同于在AMOLED显示面板内部通过阵列制程制作TFT，所述NMOS管或PMOS管的制程在AMOLED显示面板外部进行，对制程工艺的限制比较少，制程难度低、良率高，因此以NMOS管或PMOS管作为外部开关，容易实现很好的开关效果。
如图3所示，所述像素驱动电路101包括第一膜晶体管T1、第二薄膜晶体管T2、及电容C1；所述第一薄膜晶体管T1的栅极电性连接扫描信号Scan，源极电性连接数据信号Data，漏极与第二薄膜晶体管T2的栅极、及电容C1的一端电性连接；所述第二薄膜晶体管T2的漏极连接于所述第一引脚PIN1，源极电性连接有机发光二级管D的阳极；有机发光二级管D的阴极连接于所述第二引脚PIN2；所述电容C1的一端电性连接第一薄膜晶体管T1的漏极及第二薄膜晶体管T2的栅极，另一端电性连接第二薄膜晶体管T2的漏极。
当所述AMOLED显示面板100的各个显示分区进行显示，所述外部时序控制器TCON根据每一显示分区显示画面的明暗情况，向每一外部开关提供控制信号，控制较暗或呈黑色的显示画面所在显示分区所对应的外部开关断开，使得较暗或呈黑色的显示画面所在显示分区内的像素驱动电路与电源断开，阻断了漏电流，既能保证显示效果，又能消除有机发光二级管D阴极和阳极之间的应力，提高AMOLED的寿命。进一步地，所述外部时序控制器TCON匹配动态分区亮度调节(Local Dimming)算法或脉宽调制算法(Pulse Width Modulation，PWM)向每一外部开关提供控制信号，以确保画面不失真，所述Local Dimming算法或PWM算法已应用于液晶显示器，属于现有技术，此处不再展开详述。
以图2所示的显示分区1的显示画面较暗或呈黑色为例，所述外部时序控制器TCON向外部开关S1即NMOS管提供低电位的控制信号，NMOS管断开，使得显示分区1内的像素驱动电路101与电源正极走线OVDD的连接断开，即将显示分区1内的像素驱动电路101与电源断开，阻断了漏电流，该显示分区1内的有机发光二级管D阴极和阳极之间的应力得以消除。
请参阅图4，结合图2与图3，本发明还提供一种用于AMOLED分区驱动的控制方法，包括如下步骤：
步骤1、提供用于AMOLED分区驱动的控制电路。
如图2、图3所示，所述用于AMOLED分区驱动的控制电路包括：
AMOLED显示面板100，所述AMOLED显示面板100被划分多个呈阵列式排布的显示分区，每一显示分区包括多个子像素，每一子像素具有一像素驱动电路101；对所述AMOLED显示面板100划分显示分区的数量不限，可根据实际显示需求来确定，以图2所示为例，所述AMOLED显示面板100被划分成了12个显示分区，分别为显示分区1、显示分区2、直至显示分区12；
设于所述AMOLED显示面板100外部的电源(未图示)、连接电源正极的电源正极走线OVDD、连接电源负极的电源负极走线OVSS；
与多个显示分区的数量相等的多个第一引脚PIN1与第二引脚PIN2，每一显示分区内的像素驱动电路101经由一第一引脚PIN1连接电源正极走线OVDD，经由一第二引脚PIN2连接电源负极走线OVSS；以图2所示为例，设置有12个第一引脚PIN1与12个第二引脚PIN2；
设于所述AMOLED显示面板100外部，且与显示分区的数量相等的多个外部开关，以图2所示为例，设置有12个外部开关S1、S2、直至S12，将每一外部开关对应连接一第一引脚PIN1与电源正极走线OVDD，如外部开关S1连接对应于显示分区1的第一引脚PIN1与电源正极走线OVDD，外部开关S12连接对应于显示分区12的第一引脚PIN1与电源正极走线OVDD；图2示意出了将所述多个外部开关布置于靠近电源正极走线OVDD的一侧，当然也可以将所述多个外部开关布置于靠近电源负极走线OVSS的一侧，每一外部开关对应连接一第二引脚PIN2与电源负极走线OVSS；
以及一外部时序控制器TCON。
具体地，所述外部开关可为NMOS管，受高电位信号的控制导通，受低电位信号的控制断开；所述外部开关也可为PMOS管，受低电位信号的控制导通，受高电位信号的控制断开。进一步地，如图2所示，所述NMOS管或PMOS管的栅极接入由外部时序控制器TCON提供的控制信号，源极连接于电源正极走线OVDD，漏极连接于第一引脚PIN1；或者所述NMOS管或PMOS管的栅极接入由外部时序控制器TCON提供的控制信号，源极连接于电源负极走线OVSS，漏极连接于第二引脚PIN2。不同于在AMOLED显示面板内部通过阵列制程制作TFT，所述NMOS管或PMOS管的制程在AMOLED显示面板外部进行，对制程工艺的限制比较少，制程难度低、良率高，因此以NMOS管或PMOS管作为外部开关，容易实现很好的开关效果。
如图3所示，所述像素驱动电路101包括第一膜晶体管T1、第二薄膜 晶体管T2、及电容C1；所述第一薄膜晶体管T1的栅极电性连接扫描信号Scan，源极电性连接数据信号Data，漏极与第二薄膜晶体管T2的栅极、及电容C1的一端电性连接；所述第二薄膜晶体管T2的漏极连接于所述第一引脚PIN1，源极电性连接有机发光二级管D的阳极；有机发光二级管D的阴极连接于所述第二引脚PIN2；所述电容C1的一端电性连接第一薄膜晶体管T1的漏极及第二薄膜晶体管T2的栅极，另一端电性连接第二薄膜晶体管T2的漏极。
步骤2、所述AMOLED显示面板100的各个显示分区进行显示，所述外部时序控制器TCON根据每一显示分区显示画面的明暗情况，向每一外部开关提供控制信号，控制较暗或呈黑色的显示画面所在显示分区所对应的外部开关断开，使得较暗或呈黑色的显示画面所在显示分区内的像素驱动电路与电源断开。
以图2所示的显示分区1的显示画面较暗或呈黑色为例，所述外部时序控制器TCON向外部开关S1即NMOS管提供低电位的控制信号，NMOS管断开，使得显示分区1内的像素驱动电路101与电源正极走线OVDD的连接断开，即将显示分区1内的像素驱动电路101与电源断开，阻断了漏电流，该显示分区1内的有机发光二级管D阴极和阳极之间的应力得以消除。
进一步地，所述外部时序控制器TCON匹配Local Dimming算法或PWM算法向每一外部开关提供控制信号，以确保画面不失真。
上述用于AMOLED分区驱动的控制方法，通过外部时序控制器TCON提供的控制信号控制较暗或呈黑色的显示画面所在显示分区所对应的外部开关断开，使得较暗或呈黑色的显示画面所在显示分区内的像素驱动电路与电源断开，阻断了漏电流，既保证了显示效果，又消除了该显示分区内的有机发光二级管D阴极和阳极之间的应力，提高AMOLED的寿命。
综上所述，本发明的用于AMOLED分区驱动的控制电路及方法，将AMOLED显示面板划分为多个显示分区，设置与多个显示分区的数量相等的多个第一引脚与第二引脚，每一显示分区内的像素驱动电路经由一第一引脚连接电源正极走线，经由一第二引脚连接电源负极走线，且在所述AMOLED显示面板外部设置与显示分区的数量相等的多个外部开关，每一外部开关对应连接一第一引脚与电源正极走线，或每一外部开关对应连接一第二引脚与电源负极走线，通过外部时序控制器向每一外部开关提供控制信号，控制较暗或呈黑色的显示画面所在显示分区所对应的外部开关断开，使得较暗或呈黑色的显示画面所在显示分区内的像素驱动电路与电源 断开，既能保证显示效果，又能消除有机发光二级管阴极和阳极之间的应力，提高AMOLED的寿命，且不增加AMOLED的制程难度。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (11)

  1. 一种用于AMOLED分区驱动的控制电路，包括：
    AMOLED显示面板，所述AMOLED显示面板被划分多个呈阵列式排布的显示分区，每一显示分区包括多个子像素，每一子像素具有一像素驱动电路；
    设于所述AMOLED显示面板外部的电源、连接电源正极的电源正极走线、连接电源负极的电源负极走线；
    与多个显示分区的数量相等的多个第一引脚与第二引脚，每一显示分区内的像素驱动电路经由一第一引脚连接电源正极走线，经由一第二引脚连接电源负极走线；
    设于所述AMOLED显示面板外部，且与显示分区的数量相等的多个外部开关，每一外部开关对应连接一第一引脚与电源正极走线，或每一外部开关对应连接一第二引脚与电源负极走线；
    以及一外部时序控制器，所述外部时序控制器向每一外部开关提供控制信号，控制每一外部开关的闭合或断开，从而控制每一显示分区内的像素驱动电路与电源的导通或断开。
  2. 如权利要求1所述的用于AMOLED分区驱动的控制电路，其中，所述外部开关为NMOS管或PMOS管，所NMOS管或PMOS管的栅极接入由外部时序控制器提供的控制信号，源极连接于电源正极走线，漏极连接于第一引脚。
  3. 如权利要求1所述的用于AMOLED分区驱动的控制电路，其中，所述外部开关为NMOS管或PMOS管，所NMOS管或PMOS管的栅极接入由外部时序控制器提供的控制信号，源极连接于电源负极走线，漏极连接于第二引脚。
  4. 如权利要求1所述的用于AMOLED分区驱动的控制电路，其中，所述外部时序控制器匹配动态分区亮度调节算法或脉宽调制算法向每一外部开关提供控制信号。
  5. 如权利要求1所述的用于AMOLED分区驱动的控制电路，其中，所述像素驱动电路包括第一膜晶体管、第二薄膜晶体管、及电容；所述第一薄膜晶体管的栅极电性连接扫描信号，源极电性连接数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极连接于所述第一引脚，源极电性连接有机发光二级管的阳极；有机发 光二级管的阴极连接于所述第二引脚；所述电容的一端电性连接第一薄膜晶体管的漏极及第二薄膜晶体管的栅极，另一端电性连接第二薄膜晶体管的漏极。
  6. 一种用于AMOLED分区驱动的控制电路，包括：
    AMOLED显示面板，所述AMOLED显示面板被划分多个呈阵列式排布的显示分区，每一显示分区包括多个子像素，每一子像素具有一像素驱动电路；
    设于所述AMOLED显示面板外部的电源、连接电源正极的电源正极走线、连接电源负极的电源负极走线；
    与多个显示分区的数量相等的多个第一引脚与第二引脚，每一显示分区内的像素驱动电路经由一第一引脚连接电源正极走线，经由一第二引脚连接电源负极走线；
    设于所述AMOLED显示面板外部，且与显示分区的数量相等的多个外部开关，每一外部开关对应连接一第一引脚与电源正极走线，或每一外部开关对应连接一第二引脚与电源负极走线；
    以及一外部时序控制器，所述外部时序控制器向每一外部开关提供控制信号，控制每一外部开关的闭合或断开，从而控制每一显示分区内的像素驱动电路与电源的导通或断开；
    其中，所述外部开关为NMOS管或PMOS管，所NMOS管或PMOS管的栅极接入由外部时序控制器提供的控制信号，源极连接于电源正极走线，漏极连接于第一引脚；
    其中，所述外部时序控制器匹配动态分区亮度调节算法或脉宽调制算法向每一外部开关提供控制信号；
    其中，所述像素驱动电路包括第一膜晶体管、第二薄膜晶体管、及电容；所述第一薄膜晶体管的栅极电性连接扫描信号，源极电性连接数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极连接于所述第一引脚，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极连接于所述第二引脚；所述电容的一端电性连接第一薄膜晶体管的漏极及第二薄膜晶体管的栅极，另一端电性连接第二薄膜晶体管的漏极。
  7. 一种用于AMOLED分区驱动的控制方法，包括如下步骤：
    步骤1、提供用于AMOLED分区驱动的控制电路；
    所述用于AMOLED分区驱动的控制电路包括：
    AMOLED显示面板，所述AMOLED显示面板被划分多个呈阵列式排 布的显示分区，每一显示分区包括多个子像素，每一子像素具有一像素驱动电路；
    设于所述AMOLED显示面板外部的电源、连接电源正极的电源正极走线、连接电源负极的电源负极走线；
    与多个显示分区的数量相等的多个第一引脚与第二引脚，每一显示分区内的像素驱动电路经由一第一引脚连接电源正极走线，经由一第二引脚连接电源负极走线；
    设于所述AMOLED显示面板外部，且与显示分区的数量相等的多个外部开关，每一外部开关对应连接一第一引脚与电源正极走线，或每一外部开关对应连接一第二引脚与电源负极走线；
    以及一外部时序控制器；
    步骤2、所述AMOLED显示面板的各个显示分区进行显示，所述外部时序控制器根据每一显示分区显示画面的明暗情况，向每一外部开关提供控制信号，控制较暗或呈黑色的显示画面所在显示分区所对应的外部开关断开，使得较暗或呈黑色的显示画面所在显示分区内的像素驱动电路与电源断开。
  8. 如权利要求7所述的用于AMOLED分区驱动的控制方法，其中，所述步骤2中，外部时序控制器匹配动态分区亮度调节算法或脉宽调制算法向每一外部开关提供控制信号。
  9. 如权利要求7所述的用于AMOLED分区驱动的控制方法，其中，所述外部开关为NMOS管或PMOS管，所NMOS管或PMOS管的栅极接入由外部时序控制器提供的控制信号，源极连接于电源正极走线，漏极连接于第一引脚。
  10. 如权利要求7所述的用于AMOLED分区驱动的控制方法，其中，所述外部开关为NMOS管或PMOS管，所NMOS管或PMOS管的栅极接入由外部时序控制器提供的控制信号，源极连接于电源负极走线，漏极连接于第二引脚。
  11. 如权利要求7所述的用于AMOLED分区驱动的控制方法，其中，所述像素驱动电路包括第一膜晶体管、第二薄膜晶体管、及电容；所述第一薄膜晶体管的栅极电性连接扫描信号，源极电性连接数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极连接于所述第一引脚，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极连接于所述第二引脚；所述电容的一端电性连接第一薄膜晶体管的漏极及第二薄膜晶体管的栅极，另一端电性连接第二薄膜晶体管 的漏极。
PCT/CN2015/082259 2015-06-10 2015-06-25 用于amoled分区驱动的控制电路及控制方法 WO2016197409A1 (zh)

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