WO2016041276A1 - Oled像素驱动电路及电视机 - Google Patents

Oled像素驱动电路及电视机 Download PDF

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Publication number
WO2016041276A1
WO2016041276A1 PCT/CN2014/093778 CN2014093778W WO2016041276A1 WO 2016041276 A1 WO2016041276 A1 WO 2016041276A1 CN 2014093778 W CN2014093778 W CN 2014093778W WO 2016041276 A1 WO2016041276 A1 WO 2016041276A1
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Prior art keywords
oled pixel
oled
unit
nmos transistor
switch
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Ceased
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PCT/CN2014/093778
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English (en)
French (fr)
Inventor
张晓东
闫福波
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Shenzhen TCL New Technology Co Ltd
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Shenzhen TCL New Technology Co Ltd
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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]

Definitions

  • the present invention relates to the field of electronic technologies, and in particular, to an OLED pixel driving circuit and a television set.
  • AM-OLED Active-matrix organic Light-emitting diode, active matrix organic light emitting diode/active matrix organic light emitting diode
  • OLED Organic Light-Emitting Diode
  • organic light-emitting diodes have a very fast response rate of microseconds, but the existing AM-OLED TVs still have a trailing blurring effect when reproducing moving pictures.
  • the reason is that the response speed of the OLED of the AM-OLED TV is only a factor that causes the tail blur phenomenon.
  • the problem of overlap on the retina of the human eye (the persistence characteristic of the human eye, that is, the retention characteristic); and the driving mode of the OLED pixel driving circuit of the existing AM-OLED television is a hold type driving mode, and the holding type driving mode is caused Another factor in which motion pictures overlap on the retina of the human eye to produce a trailing blur.
  • the feature of the hold-type driving mode of the AM-OLED television is that the picture is displayed by lines and faces. When scanning one line of OLED pixels, the line of OLED pixels remains illuminated for one frame period until the next frame period. When the arrival is refreshed by the new image data, the new image data will also remain for one frame cycle time.
  • FIG. 1 is a schematic diagram showing the circuit structure of an OLED pixel-holding type driving circuit of an AM-OLED television set in the prior art.
  • the driving circuit includes a plurality of OLED pixel units 10 arranged in a matrix, a scan line Scan-Line correspondingly connected to each row of OLED pixel units, a data line Data-Line corresponding to each column of OLED pixel units, and each column of OLEDs.
  • the pixel unit corresponds to a power line Power-Line connected, and the power line of each column of the OLED pixel unit is connected to the power supply input terminal Vdd.
  • Each of the pixel units is composed of three sub-pixels of R, G, and B.
  • the OLED pixel-retaining driving circuit of the embodiment includes 1920 ⁇ 1080 OLED pixel units 10, that is, 1920 columns.
  • the scan line of the OLED pixel unit of the first row is Scan-Line1
  • the scan line of the OLED pixel unit of the second row is Scan-Line 2
  • the scan line of the OLED pixel unit of the 1080th line is Scan-Line 1080 (third The OLED pixel unit of row 1079 is not shown)
  • the data line of the OLED pixel unit of the first column is Data-Line1
  • the data line of the OLED pixel unit of the second column is Data-Line2
  • the OLED of the 1920th column The data line of the pixel unit is Data-Line1920 (the OLED pixel unit of the third column to the 1919th column, not shown);
  • the power line of the OLED pixel unit of the first column is Power-Line1
  • the OLED pixel unit of the second column is Data-Line1
  • the pixel unit 10 includes a first NMOS transistor T1, a second NMOS transistor T2, and a charging capacitor C. And an organic light emitting diode OLED; wherein the gate of the first NMOS transistor T1 is connected to the scan line Scan-Line1, the drain of the first NMOS transistor T1 is connected to the data line Data-Line1, and the sources of the first NMOS transistor T1 are respectively The first end of the charging capacitor C and the gate of the second NMOS transistor T2 are connected; the second end of the charging capacitor C is grounded; the drain of the second NMOS transistor T2 is connected to the power line Power-Line1, and the source of the second NMOS transistor T2 The pole is connected to the anode of the organic light emitting diode OLED; the cathode of the organic light emitting diode OLED is grounded.
  • FIG. 2 is a scanning driving waveform diagram of a single OLED pixel unit in an OLED pixel-holding type driving circuit of an AM-OLED television set in the prior art.
  • V-Scan is the scan signal of the scanning line Scan-Line1 in FIG. 1
  • V-Data is the image data signal of the data line Data-Line1
  • I-Oled is the current signal of the organic light emitting diode OLED.
  • Tv is the frame period.
  • the first NMOS transistor T1 When the scan signal V-Scan of the scan line Scan-Line1 comes and is at a high level, the first NMOS transistor T1 is turned on, and at this time, the image data signal V-Data of the data line Data-Line1 is supplied to the charging capacitor through the first NMOS transistor T1.
  • the second NMOS transistor T2 is always in a conductive state within one frame period Tv, that is, the organic light emitting diode OLED is always in one frame period Tv.
  • the current I-Oled flows through, so that the organic light emitting diode OLED is always in a light-emitting state within one frame period Tv until the arrival of a new image data signal in the next frame. That is, the light-emitting time of the organic light-emitting diode of each pixel unit in the OLED pixel-holding type driving circuit shown in FIG.
  • 1 is equal to the duration of the frame period Tv, that is, the length of time during which the organic light-emitting diode maintains the light-emitting period is the frame period Tv. The above process will be repeated when the next frame of new image data signals arrives.
  • the main object of the present invention is to improve the trailing blurring effect of an AM-OLED television set when reproducing a moving picture.
  • the present invention provides an OLED pixel driving circuit, the OLED pixel driving circuit comprising a plurality of OLED pixel units arranged in a matrix, scan lines correspondingly connected to each row of the OLED pixel units, and each column a data line corresponding to the OLED pixel unit, a power line connected to each row of the OLED pixel unit, and a control respectively connected to each of the power lines for controlling the illumination time of each of the OLED pixel units Module.
  • control module includes a power supply input end, a main control unit, and a switch unit;
  • One end of the switch unit is connected to each of the power lines, and the other end of the switch unit is connected to the power supply input end, and the control end of the switch unit is connected to the main control unit;
  • the main control unit outputs a switch control signal to the control end of the switch unit, and the switch unit controls the connection and disconnection states of the power supply input end and each of the power lines according to the switch control signal, thereby controlling The luminescence time of each of the OLED pixel units.
  • the switch unit includes an electronic switch connected in one-to-one correspondence with the power line, one end of the electronic switch is connected to one power line, and the other end of the electronic switch is connected to the power input end.
  • the control end of the electronic switch is connected in one-to-one correspondence with the control signal output end of the main control unit.
  • the controlling the lighting time of each of the OLED pixel units comprises: the pulse width T of the switch control signal output by the main control unit is smaller than the OLED pixel driving circuit frame period TV.
  • the OLED pixel unit includes an OLED and a pixel driving unit for driving the OLED;
  • the pixel driving unit includes a first NMOS transistor, a second NMOS transistor, and a charging capacitor; wherein, the first NMOS transistor a gate is connected to the scan line, a drain of the first NMOS transistor is connected to the data line, and a source of the first NMOS transistor is respectively connected to a first end of the charging capacitor and the second NMOS a gate of the tube is connected; a second end of the charging capacitor is grounded; a drain of the second NMOS transistor is connected to the power line, and a source of the second NMOS transistor is connected to an anode of the OLED; The cathode ground of the OLED;
  • the first NMOS transistor When the scan signal of the scan line is at a high level, the first NMOS transistor is turned on, and the image data signal of the data line charges the charging capacitor when the first NMOS transistor is turned on.
  • the voltage of the charging capacitor reaches the turn-on voltage of the second NMOS transistor, the second NMOS transistor is turned on, when the second NMOS transistor is turned on, and the power supply input end is in communication with the power line.
  • the supply voltage of the input end of the power supply is applied to the anode of the OLED, and the OLED emits light.
  • the main control unit is a single chip microcomputer.
  • control end of the electronic switch is connected to the I/O port of the single chip in one-to-one correspondence.
  • the pixel driving circuit comprises 1920 ⁇ 1080 OLED pixel units.
  • the OLED pixel unit is divided into a plurality of regions for scanning driving.
  • the OLED pixel unit is divided into eight regions for scanning driving.
  • the present invention further provides a television set including an OLED pixel driving circuit, the OLED pixel driving circuit comprising a plurality of OLED pixel units arranged in a matrix, and each row of the OLED pixel unit Correspondingly connected scan lines, data lines correspondingly connected to each column of the OLED pixel units, power lines connected to each row of the OLED pixel units, and respectively connected to the respective power lines for respectively A control module for controlling the illumination time of the OLED pixel unit.
  • control module includes a power supply input end, a main control unit, and a switch unit;
  • One end of the switch unit is connected to each of the power lines, and the other end of the switch unit is connected to the power supply input end, and the control end of the switch unit is connected to the main control unit;
  • the main control unit outputs a switch control signal to the control end of the switch unit, and the switch unit controls the connection and disconnection states of the power supply input end and each of the power lines according to the switch control signal, thereby controlling The luminescence time of each of the OLED pixel units.
  • the switch unit includes an electronic switch connected in one-to-one correspondence with the power line, one end of the electronic switch is connected to one power line, and the other end of the electronic switch is connected to the power input end.
  • the control end of the electronic switch is connected in one-to-one correspondence with the control signal output end of the main control unit.
  • the controlling the lighting time of each of the OLED pixel units comprises: the pulse width T of the switch control signal output by the main control unit is smaller than the OLED pixel driving circuit frame period TV.
  • the OLED pixel unit includes an OLED and a pixel driving unit for driving the OLED;
  • the pixel driving unit includes a first NMOS transistor, a second NMOS transistor, and a charging capacitor; wherein, the first NMOS transistor a gate is connected to the scan line, a drain of the first NMOS transistor is connected to the data line, and a source of the first NMOS transistor is respectively connected to a first end of the charging capacitor and the second NMOS a gate of the tube is connected; a second end of the charging capacitor is grounded; a drain of the second NMOS transistor is connected to the power line, and a source of the second NMOS transistor is connected to an anode of the OLED; The cathode ground of the OLED;
  • the first NMOS transistor When the scan signal of the scan line is at a high level, the first NMOS transistor is turned on, and the image data signal of the data line charges the charging capacitor when the first NMOS transistor is turned on.
  • the voltage of the charging capacitor reaches the turn-on voltage of the second NMOS transistor, the second NMOS transistor is turned on, when the second NMOS transistor is turned on, and the power supply input end is in communication with the power line.
  • the supply voltage of the input end of the power supply is applied to the anode of the OLED, and the OLED emits light.
  • the main control unit is a single chip microcomputer.
  • control end of the electronic switch is connected to the I/O port of the single chip in one-to-one correspondence.
  • the pixel driving circuit comprises 1920 ⁇ 1080 OLED pixel units.
  • the OLED pixel unit is divided into a plurality of regions for scanning driving.
  • the OLED pixel unit is divided into eight regions for scanning driving.
  • the OLED pixel driving circuit provided by the present invention comprises a plurality of OLED pixel units arranged in a matrix, scan lines correspondingly connected to each row of OLED pixel units, data lines correspondingly connected to each column of OLED pixel units, and corresponding to each row of OLED pixel units.
  • the OLED pixel driving circuit of the invention can greatly improve the tailing blur effect of the AM-OLED television set when reproducing a moving picture.
  • the OLED pixel driving circuit of the invention has the advantages of simple structure and easy implementation.
  • FIG. 1 is a schematic circuit diagram of an embodiment of an OLED pixel-retaining driving circuit of an AM-OLED television set in the prior art
  • FIG. 2 is a scanning drive waveform diagram of a single OLED pixel unit in an OLED pixel-holding type driving circuit of an AM-OLED television set in the prior art
  • FIG. 3 is a schematic diagram showing the circuit structure of an embodiment of an OLED pixel driving circuit of the present invention.
  • FIG. 4 is a driving timing diagram of an embodiment of an OLED pixel driving circuit of the present invention.
  • FIG. 5 is a scanning drive waveform diagram of a single OLED pixel unit in an OLED pixel driving circuit of the present invention
  • FIG. 6 is an eight-region scan driving timing diagram of the OLED pixel driving circuit of the present invention.
  • the invention provides an OLED pixel driving circuit.
  • FIG. 3 is a schematic diagram showing the circuit structure of an embodiment of an OLED pixel driving circuit of the present invention.
  • the OLED pixel driving circuit includes a plurality of OLED pixel units 20 arranged in a matrix, and a scan line Scan correspondingly connected to each row of the OLED pixel units a data line, a data line corresponding to each column of the OLED pixel unit, and a power line connected to each row of the OLED pixel unit. a line, and a control module 30 for controlling the lighting time of each of the OLED pixel units 20; the control module 30 is connected to each of the power lines Power Line.
  • the OLED pixel driving circuit of this embodiment includes 1920 ⁇ 1080 OLED pixel units 20, that is, includes 1920 columns of OLED pixel units and 1080 rows of OLED pixel units.
  • the scan line of the OLED pixel unit of the first row is Scan Line1
  • the scan line of the OLED pixel unit of the second row is Scan Line2
  • the scan line of the OLED pixel unit of the 1080th line is Scan Line1080 (the OLED pixel unit of the 3rd line to the 1079th line, not shown)
  • the data line of the OLED pixel unit of the 1st column is Data Line1
  • the data line of the OLED pixel unit of the second column is Data Line2
  • the data line of the OLED pixel unit of the 1920th column is Data Line1920 (the OLED pixel unit in rows 3 to 1919, not shown)
  • the power line of the OLED pixel unit in the first row is Power Line1
  • the power line of the OLED pixel unit in the second row is Power Line2
  • the OLED pixel unit 20 includes an organic light emitting diode OLED and a pixel driving unit 21 for driving the organic light emitting diode OLED.
  • the pixel driving unit 21 includes a first NMOS transistor Q1, a second NMOS transistor Q2, and a charging capacitor C1.
  • the gate of the first NMOS transistor Q1 and the scan line Scan Line connection, the drain of the first NMOS transistor Q1 and the data line Data Line connection, the source of the first NMOS transistor Q1 is respectively connected to the first end of the charging capacitor C1 and the gate of the second NMOS transistor Q2; the second end of the charging capacitor C1 is grounded; the drain and the power of the second NMOS transistor Q2 Line Power Line connection, the source of the second NMOS transistor Q2 is connected to the anode of the organic light emitting diode oled; the cathode of the organic light emitting diode OLED is grounded;
  • control module 30 includes a power supply input terminal VDD, a main control unit 31, and a switch unit 32. Wherein one end of the switch unit 32 and each of the power lines Power The other end of the switch unit 32 is connected to the power supply input terminal VDD, and the control end of the switch unit 32 is connected to the main control unit 31.
  • the main control unit 31 outputs a corresponding switch control signal to the control end of the switch unit 32, and the switch unit 32 controls the power supply input terminal VDD according to the received switch control signal.
  • Each of the power lines Power The connected and disconnected states of the line, thereby controlling the lighting time of each of the OLED pixel units 20.
  • the switch unit 32 includes the power line Power Line one by one corresponding to the connected electronic switch. Since the embodiment includes 1080 rows of OLED pixel units, that is, corresponding to 1080 power lines. Line, that is, the switching unit 32 in this embodiment includes 1080 electronic switches.
  • one end of the electronic switch SW1 and the power line Power Line 1 is connected, and the other end of the electronic switch SW1 is connected to the power supply input terminal VDD; one end of the electronic switch SW2 and the power line Power Line 2 is connected, and the other end of the electronic switch SW2 is connected to the power supply input terminal VDD; one end of the electronic switch SW1080 and the power line Power
  • the other end of the electronic switch SW1080 is connected to the power supply input terminal VDD (the electronic switch SW3 to the electronic switch SW1079, not shown); the control end of each electronic switch (ie, the electronic switch SW1 to the electronic switch SW1080)
  • the control signal output terminals of the main control unit 31 are connected one-to-one.
  • the main control unit 31 is a single-chip MCU, and the control ends of the electronic switches are connected one-to-one with the I/O ports of the MCU of the single-chip microcomputer.
  • the control end of the electronic switch SW1 is connected to the I/O1 port of the MCU of the single chip microcomputer
  • the control end of the electronic switch SW2 is connected to the I/O2 port of the MCU of the single chip microcomputer
  • the control end of the electronic switch SW1080 is connected with the I/O 1080 port of the MCU of the single chip microcomputer.
  • the difference between the OLED pixel driving circuit of the present embodiment and the OLED pixel-retaining driving circuit of the prior art AM-OLED television shown in FIG. 1 is that the power lines of all the OLED pixel units in the OLED pixel driving circuit of the embodiment are Instead of being connected together, the power lines of the OLED pixel units of the same row are connected together, and the power lines of the OLED pixel units that are not in the same direction are independent.
  • the working principle of the above control module 30 in this embodiment is: the MCU of the single-chip microcomputer outputs the switch control signal through the I/O port, and controls the power supply input terminal VDD and the power line Power through the switch unit 32.
  • Line1 to power line Power The connection and disconnection of the line 1080 enable the power supply input terminal VDD to supply power to the organic light emitting diode OLED in each OLED pixel unit in the OLED pixel driving circuit of the embodiment.
  • the control module 30 outputs a corresponding control signal to separately control the illumination states of the organic light emitting diodes oled in each row of OLED pixel units, so that the illumination characteristics of the CRT television set can be realized.
  • the control module 30 can achieve the lighting characteristics that are completely equivalent to the CRT TV (the light-emitting characteristic of the CRT TV is that after the phosphor of a certain pixel is excited, the pixel is in one frame period) From being excited to not emitting light at all, only about 3ms), the purpose of improving the trailing blurring effect of the AM-OLED television set in reproducing the moving picture is achieved.
  • Hsync is the line scan synchronization signal sync of the MCU of the single chip microcomputer
  • IO1 is the control signal outputted by the I/O1 port of the MCU of the single chip microcomputer
  • IO2 is the control signal of the I/O2 port output of the MCU of the single chip microcomputer
  • IO1080 is The control signal of the I/O1080 port output of the MCU of the MCU (the control signal of the I/O3 port of the MCU MCU to the output of the I/O1079 port, not shown)
  • Power L1 is the power supply signal of the power line Power Line1 of the first row OLED pixel unit
  • Power L2 is the power line of the second row OLED pixel unit Power.
  • Power L1080 is the power line of the 1080th line OLED pixel unit Power Line1080 power supply signal (the power supply signal of the OLED pixel unit of the 3rd line to the 1079th line, the figure is not shown);
  • ⁇ t is the phase difference of the control signal outputted by each I/O port of the MCU of the MCU;
  • T is the MCU of the MCU The pulse width of the control signal output by each I/O port.
  • VScan is the scan line Scan of FIG. Line1 scan signal
  • VData is the image data signal of data line Data Line1 in Figure 3
  • Power L1 is the power line Power in Figure 3.
  • the power supply signal of Line1 Ioled is the current signal of the organic light emitting diode oled in FIG. 3
  • TV is the frame period
  • T is the pulse width of the control signal outputted by each I/O port of the MCU of the single chip microcomputer.
  • the power supply input terminal VDD and the power line Power When Line1 is in the connected state (that is, when the control signal output from the I/O1 port of the MCU is high level, that is, when the electronic switch SW1 is in the closed state), the power supply voltage of the power supply input terminal VDD is passed through the power line Power.
  • Line1 is applied to the anode of the organic light emitting diode OLED by the second NMOS transistor Q2 (corresponding to the power supply signal of the power line Power Line1)
  • L1 is at a high level, a current Ioled flows through the organic light emitting diode OLED, so that the organic light emitting diode Ioled emits light.
  • the power line Power Line1 power supply signal Power When L1 is low (that is, when the control signal output from the I/O1 port of the MCU is low), the supply voltage of the VDD input terminal of the power supply cannot be applied to the organic light emitting diode OLED via the second NMOS transistor Q2, thereby making the organic The LED oled does not emit light.
  • the illuminating time of the organic light emitting diode oled in each OLED pixel unit in the OLED pixel driving circuit of the embodiment is the pulse width T of the control signal output by the single chip MCU (pulse width T ⁇
  • the frame period TV determines that the OLED pixel driving circuit of the present embodiment is reduced from the original frame period TV to T (T ⁇ frame period) relative to the OLED pixel-holding type driving circuit of the prior art. TV).
  • the organic light emitting diode oled since the organic light emitting diode oled does not consume electric energy during the (TV-T) time in one frame period TV, the OLED pixel driving circuit of the embodiment also achieves the purpose of energy saving.
  • the OLED pixel unit of the OLED pixel driving circuit shown in FIG. 3 is divided into rows by appropriately adjusting the phase difference ⁇ t and the pulse width T of the control signal outputted by the MCU of the single chip microcomputer in FIG. Scanning drive in multiple areas enables TFT equivalent Multi-zone backlight scanning function of LCD TVs (belonging to the prior art, not repeated here).
  • the setting is the same, that is, the control signals IO1 to IO135 outputted by the MCU of the single chip in Fig. 3 are the same, the control signals IO136 to IO270 output by the MCU of the single chip are the same, and the control signals IO946 to IO1080 output by the MCU of the single chip are the same; the power line Power Line1 to Power Line135 have the same power supply signal (ie Power L1 to Power L135), power line Power Line136 to Power Line270 has the same power supply signal (ie Power L136 to Power L270), power line Power Line946 to Power Line1080 has the same power supply signal (ie Power L946 to Power) L1080 is the same).
  • FIG. 6 is an eight-region scan driving timing diagram of the OLED pixel driving circuit of the present invention.
  • the OLED pixel driving circuit scans and drives the OLED pixel unit of each region according to the eight-region scanning driving timing diagram shown in FIG. Improve the purpose of trailing blurring effects when reproducing motion pictures.
  • the OLED pixel driving circuit provided by the embodiment outputs the corresponding switch control signal to the control end of each electronic switch through the I/O port of the MCU of the single-chip microcomputer in the control module, thereby controlling the power supply line of the power supply input end and each row of the OLED pixel unit.
  • the OLED pixel driving circuit of the embodiment has the advantages of simple structure and easy implementation.
  • the present invention also provides a television set, which includes an OLED pixel driving circuit.
  • the circuit structure of the OLED pixel driving circuit can be referred to the above embodiment, and details are not described herein.
  • the television set of the embodiment adopts the technical solution of the above OLED pixel driving circuit, the television set has all the beneficial effects of the above OLED pixel driving circuit.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

一种OLED像素驱动电路及电视机。像素驱动电路包括呈矩阵设置的若干OLED像素单元（20），与每一行OLED像素单元（20）对应连接的扫描线（Scan Line），与每一列OLED像素单元（20）对应连接的数据线（Data Line），与每一行OLED像素单元（20）对应连接的电源线（Power Line），以及分别与各电源线（Power Line）连接的用于分别对各OLED像素单元（20）的发光时间进行控制的控制模块（30）。该OLED像素驱动电路能改善在重现运动画面时的拖尾模糊效应。

Description

OLED像素驱动电路及电视机
技术领域
本发明涉及电子技术领域，特别涉及一种OLED像素驱动电路及电视机。
背景技术
现有的AM-OLED电视机（AM-OLED，Active-matrix organic light-emitting diode，有源矩阵有机发光二极管/主动矩阵有机发光二极管），其OLED（Organic Light-Emitting Diode，有机发光二极管）的响应速度很快，达到了微秒级，但是，现有的AM-OLED电视机在重现运动画面时的拖尾模糊现象依然存在。究其原因，AM-OLED电视机的OLED的响应速度快慢仅是造成拖尾模糊现象的一个因素，通过提高OLED的响应速度，解决了图像信号显示时的重叠问题，但是，没有解决运动画面在人眼视网膜上的重叠问题（人眼的视觉暂留特性，即保持特性）；而现有AM-OLED电视机的OLED像素驱动电路的驱动方式是保持型驱动方式，该保持型驱动方式是造成运动画面在人眼视网膜上重叠而产生拖尾模糊现象的另一个因素。AM-OLED电视机的该保持型驱动方式的特点是，画面是由线而面进行显示的，每扫描一行OLED像素时，该行OLED像素在一个帧周期内一直保持发光，直到下一个帧周期到来被新的图像数据刷新，新的图像数据同样会保持一个帧周期时间。
AM-OLED电视机的这种保持型驱动方式，虽然使AM- OLED电视机取得了较好的静态画面效果（不会像CRT电视机那样存在闪烁现象），但是，也正是由于AM- OLED电视机的该保持型驱动方式，使得AM-OLED电视机在重现运动画面时产生拖尾模糊现象。
参照图1，图1是现有技术中AM-OLED电视机的OLED像素保持型驱动电路一实施例的电路结构示意图。该驱动电路包括呈矩阵设置的若干OLED像素单元10、与每一行OLED像素单元对应连接的一扫描线Scan-Line、与每一列OLED像素单元对应连接的一数据线Data-Line、与每一列OLED像素单元对应连接的一电源线Power-Line，并且各列OLED像素单元的电源线Power-Line均与供电电源输入端Vdd连接。每一个像素单元均由R，G，B三个子像素构成，本案均以其中一个子像素为例说明，本实施例OLED像素保持型驱动电路包括1920×1080个OLED像素单元10，即包括1920列OLED像素单元和1080行OLED像素单元。具体地，第1行的OLED像素单元的扫描线为Scan-Line1，第2行的OLED像素单元的扫描线为Scan-Line2，第1080行的OLED像素单元的扫描线为Scan-Line1080（第3行至第1079行的OLED像素单元，图未示）；第1列的OLED像素单元的数据线为Data-Line1，第2列的OLED像素单元的数据线为Data-Line2，第1920列的OLED像素单元的数据线为Data-Line1920（第3列至第1919列的OLED像素单元，图未示）；第1列的OLED像素单元的电源线为Power-Line1，第2列的OLED像素单元的电源线为Power-Line2，第1920列的OLED像素单元的电源线为Power-Line1920（第3列至第1919列的OLED像素单元的电源线，图未示）；各列的OLED像素单元的电源线（即Power-Line1至Power-Line1920）均与供电电源输入端Vdd连接。其中，像素单元10包括第一NMOS管T1、第二NMOS管T2、充电电容C 及有机发光二极管OLED；其中，第一NMOS管T1的栅极与扫描线Scan-Line1连接，第一NMOS管T1的漏极与数据线Data-Line1连接，第一NMOS管T1的源极分别与充电电容C的第一端及第二NMOS管T2的栅极连接；充电电容C的第二端接地；第二NMOS管T2的漏极与电源线Power-Line1连接，第二NMOS管T2的源极与有机发光二极管OLED的阳极连接；有机发光二极管OLED的阴极接地。
参照图2，图2是现有技术中AM-OLED电视机的OLED像素保持型驱动电路中单个OLED像素单元的扫描驱动波形图。一并参照图1和图2，V-Scan为图1中扫描线Scan-Line1的扫描信号，V-Data为数据线Data-Line1的图像数据信号，I-Oled为有机发光二极管OLED的电流信号，Tv为帧周期。当扫描线Scan-Line1的扫描信号V-Scan到来且为高电平时，第一NMOS管T1导通，此时数据线Data-Line1的图像数据信号V-Data通过第一NMOS管T1给充电电容C充电，当充电电容C的电压达到第二NMOS管T2的开启电压时，第二NMOS管T2导通，当第二NMOS管T2导通时，供电电源输入端Vdd的供电电压经电源线Power-Line1，通过第二NMOS管T2加到有机发光二极管OLED上，使得有机发光二极管OLED中有电流I-Oled流过，从而使得有机发光二极管OLED发光。当充电电容C的充电过程结束后，扫描线Scan-Line1的扫描信号V-Scan为低电平，使得第一NMOS管T1关断。由于充电电容C上的电压无处释放，从而其电压保持不变，进而使得第二NMOS管T2在一个帧周期Tv内一直处于导通状态，即使得有机发光二极管OLED在一个帧周期Tv内一直有电流I-Oled流过，从而使得机发光二极管OLED在一个帧周期Tv内一直处于发光状态，直到下一帧新的图像数据信号的到来。即图1所示OLED像素保持型驱动电路中的每一个像素单元的有机发光二极管的发光时间均等于帧周期Tv的时长，即有机发光二极管保持发光的长度为帧周期Tv的时长。下一帧新的图像数据信号到来时，将重复上述过程。
发明内容
本发明的主要目的是改善AM-OLED电视机在重现运动画面时所产生拖尾模糊效应。
为实现上述目的，本发明提供一种OLED像素驱动电路，所述OLED像素驱动电路包括呈矩阵设置的若干OLED像素单元、与每一行所述OLED像素单元对应连接的扫描线、与每一列所述OLED像素单元对应连接的数据线、与每一行所述OLED像素单元对应连接的电源线、及分别与各所述电源线连接的用于分别对各所述OLED像素单元的发光时间进行控制的控制模块。
优选地，所述控制模块包括供电电源输入端、主控单元及开关单元；其中，
所述开关单元的一端与各所述电源线连接，所述开关单元的另一端与所述供电电源输入端连接，所述开关单元的控制端与所述主控单元连接；
所述主控单元输出开关控制信号至所述开关单元的控制端，所述开关单元根据所述开关控制信号控制所述供电电源输入端与各所述电源线的连通与断开状态，进而控制各所述OLED像素单元的发光时间。
优选地，所述开关单元包括与所述电源线一一对应连接的电子开关，所述电子开关的一端与一所述电源线连接，所述电子开关的另一端与所述供电电源输入端连接，所述电子开关的控制端与所述主控单元的控制信号输出端一一对应连接。
优选地，所述控制各所述OLED像素单元的发光时间包括：所述主控单元输出的开关控制信号的脉宽T小于所述OLED像素驱动电路帧周期TV。
优选地，所述OLED像素单元包括OLED及用于驱动所述OLED的像素驱动单元；所述像素驱动单元包括第一NMOS管、第二NMOS管及充电电容；其中，所述第一NMOS管的栅极与所述扫描线连接，所述第一NMOS管的漏极与所述数据线连接，所述第一NMOS管的源极分别与所述充电电容的第一端及所述第二NMOS管的栅极连接；所述充电电容的第二端接地；所述第二NMOS管的漏极与所述电源线连接，所述第二NMOS管的源极与所述OLED的阳极连接；所述OLED的阴极接地；
当所述扫描线的扫描信号为高电平时，所述第一NMOS管导通，所述数据线的图像数据信号在所述第一NMOS管导通时对所述充电电容进行充电，当所述充电电容的电压达到所述第二NMOS管的开启电压时，所述第二NMOS管导通，当所述第二NMOS管导通且所述供电电源输入端与所述电源线为连通状态时，所述供电电源输入端的供电电压加到所述OLED的阳极，所述OLED发光工作。
优选地，所述主控单元为单片机。
优选地，所述电子开关的控制端与所述单片机的I/O口一一对应连接。
优选地，所述像素驱动电路包括1920×1080个OLED像素单元。
优选地，所述OLED像素单元按行分成多个区域进行扫描驱动。
优选地，所述OLED像素单元按行分成八个区域进行扫描驱动。
此外，为实现上述目的，本发明还提供一种电视机，所述电视机包括OLED像素驱动电路，所述OLED像素驱动电路包括呈矩阵设置的若干OLED像素单元、与每一行所述OLED像素单元对应连接的扫描线、与每一列所述OLED像素单元对应连接的数据线、与每一行所述OLED像素单元对应连接的电源线、及分别与各所述电源线连接的用于分别对各所述OLED像素单元的发光时间进行控制的控制模块。
优选地，所述控制模块包括供电电源输入端、主控单元及开关单元；其中，
所述开关单元的一端与各所述电源线连接，所述开关单元的另一端与所述供电电源输入端连接，所述开关单元的控制端与所述主控单元连接；
所述主控单元输出开关控制信号至所述开关单元的控制端，所述开关单元根据所述开关控制信号控制所述供电电源输入端与各所述电源线的连通与断开状态，进而控制各所述OLED像素单元的发光时间。
优选地，所述开关单元包括与所述电源线一一对应连接的电子开关，所述电子开关的一端与一所述电源线连接，所述电子开关的另一端与所述供电电源输入端连接，所述电子开关的控制端与所述主控单元的控制信号输出端一一对应连接。
优选地，所述控制各所述OLED像素单元的发光时间包括：所述主控单元输出的开关控制信号的脉宽T小于所述OLED像素驱动电路帧周期TV。
优选地，所述OLED像素单元包括OLED及用于驱动所述OLED的像素驱动单元；所述像素驱动单元包括第一NMOS管、第二NMOS管及充电电容；其中，所述第一NMOS管的栅极与所述扫描线连接，所述第一NMOS管的漏极与所述数据线连接，所述第一NMOS管的源极分别与所述充电电容的第一端及所述第二NMOS管的栅极连接；所述充电电容的第二端接地；所述第二NMOS管的漏极与所述电源线连接，所述第二NMOS管的源极与所述OLED的阳极连接；所述OLED的阴极接地；
当所述扫描线的扫描信号为高电平时，所述第一NMOS管导通，所述数据线的图像数据信号在所述第一NMOS管导通时对所述充电电容进行充电，当所述充电电容的电压达到所述第二NMOS管的开启电压时，所述第二NMOS管导通，当所述第二NMOS管导通且所述供电电源输入端与所述电源线为连通状态时，所述供电电源输入端的供电电压加到所述OLED的阳极，所述OLED发光工作。
优选地，所述主控单元为单片机。
优选地，所述电子开关的控制端与所述单片机的I/O口一一对应连接。
优选地，所述像素驱动电路包括1920×1080个OLED像素单元。
优选地，所述OLED像素单元按行分成多个区域进行扫描驱动。
优选地，所述OLED像素单元按行分成八个区域进行扫描驱动。
本发明提供的OLED像素驱动电路，包括呈矩阵设置的若干OLED像素单元、与每一行OLED像素单元对应连接的扫描线、与每一列OLED像素单元对应连接的数据线、与每一行OLED像素单元对应连接的电源线、及分别与各电源线连接的用于分别对各OLED像素单元的发光时间进行控制的控制模块。本发明OLED像素驱动电路能够极大地改善AM-OLED电视机在重现运动画面时的拖尾模糊效应。同时，本发明OLED像素驱动电路还具有结构简单及易实现的优点。
附图说明
图1是现有技术中AM-OLED电视机的OLED像素保持型驱动电路一实施例的电路结构示意图；
图2是现有技术中AM-OLED电视机的OLED像素保持型驱动电路中单个OLED像素单元的扫描驱动波形图；
图3是本发明OLED像素驱动电路一实施例的电路结构示意图；
图4是本发明OLED像素驱动电路一实施例的驱动时序图；
图5是本发明OLED像素驱动电路中单个OLED像素单元的扫描驱动波形图；
图6是本发明OLED像素驱动电路的八区域扫描驱动时序图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明提供一种OLED像素驱动电路。
参照图3，图3是本发明OLED像素驱动电路一实施例的电路结构示意图。
该OLED像素驱动电路包括呈矩阵设置的若干OLED像素单元20、与每一行所述OLED像素单元对应连接的扫描线Scan Line、与每一列所述OLED像素单元对应连接的数据线Data Line、与每一行所述OLED像素单元对应连接的电源线Power Line、及用于分别对各所述OLED像素单元20的发光时间进行控制的控制模块30；所述控制模块30与各所述电源线Power Line连接。
本实施例OLED像素驱动电路包括1920×1080个OLED像素单元20，即包括1920列OLED像素单元和1080行OLED像素单元。具体地，第1行的OLED像素单元的扫描线为Scan Line1，第2行的OLED像素单元的扫描线为Scan Line2，第1080行的OLED像素单元的扫描线为Scan Line1080（第3行至第1079行的OLED像素单元，图未示）；第1列的OLED像素单元的数据线为Data Line1，第2列的OLED像素单元的数据线为Data Line2，第1920列的OLED像素单元的数据线为Data Line1920（第3列至第1919行的OLED像素单元，图未示）；第1行的OLED像素单元的电源线为Power Line1，第2行的OLED像素单元的电源线为Power Line2，第1920行的OLED像素单元的电源线为Power Line1920（第3行至第1079行的OLED像素单元的电源线，图未示）；并且，各行的OLED像素单元的电源线（即Power Line1至Power Line1920）均与控制模块30连接。
本实施例中，上述OLED像素单元20包括有机发光二极管oled及用于驱动有机发光二极管oled的像素驱动单元21。其中，所述像素驱动单元21包括第一NMOS管Q1、第二NMOS管Q2及充电电容C1。具体地，第一NMOS管Q1的栅极与扫描线Scan Line连接，第一NMOS管Q1的漏极与数据线Data Line连接，第一NMOS管Q1的源极分别与充电电容C1的第一端及第二NMOS管Q2的栅极连接；充电电容C1的第二端接地；第二NMOS管Q2的漏极与电源线Power Line连接，第二NMOS管Q2的源极与有机发光二极管oled的阳极连接；有机发光二极管oled的阴极接地；
本实施例中，所述控制模块30包括供电电源输入端VDD、主控单元31及开关单元32。其中，开关单元32的一端与各所述电源线Power Line连接，所述开关单元32的另一端与所述供电电源输入端VDD连接，所述开关单元32的控制端与所述主控单元31连接。
本实施例中，所述主控单元31输出相应的开关控制信号至所述开关单元32的控制端，所述开关单元32根据接收到的所述开关控制信号控制所述供电电源输入端VDD与各所述电源线Power Line的连通与断开状态，进而控制各所述OLED像素单元20的发光时间。
开关单元32包括与所述电源线Power Line一一对应连接的电子开关。由于本实施例包括1080行OLED像素单元，即对应1080条电源线Power Line，即本实施例中开关单元32包括1080个电子开关。其中，电子开关SW1的一端与所述电源线Power Line1连接，电子开关SW1的另一端与所述供电电源输入端VDD连接；电子开关SW2的一端与所述电源线Power Line2连接，电子开关SW2的另一端与所述供电电源输入端VDD连接；电子开关SW1080的一端与所述电源线Power Line1080连接，电子开关SW1080的另一端与所述供电电源输入端VDD连接（电子开关SW3至电子开关SW1079，图未示）；各电子开关（即电子开关SW1至电子开关SW1080）的控制端与所述主控单元31的控制信号输出端一一对应连接。本实施例中，主控单元31为单片机MCU，各电子开关的控制端与单片机MCU的I/O口一一对应连接。具体地，电子开关SW1的控制端与单片机MCU的I/O1口连接，电子开关SW2的控制端与单片机MCU的I/O2口连接，电子开关SW1080的控制端与单片机MCU的I/O1080口连接。
本实施例OLED像素驱动电路和图1所示现有技术中AM-OLED电视机的OLED像素保持型驱动电路的不同点是：本实施例OLED像素驱动电路中的所有OLED像素单元的电源线并不是连接在一起的，而是同一行的OLED像素单元的电源线连接在一起，而不同行的OLED像素单元的电源线各自独立。
本实施例中的上述控制模块30的工作原理为：单片机MCU通过I/O口输出开关控制信号，通过开关单元32，控制供电电源输入端VDD与电源线Power Line1至电源线Power Line1080的连通与断开，实现供电电源输入端VDD对本实施例OLED像素驱动电路中各OLED像素单元中的有机发光二极管oled的供电。具体地，单片机MCU的各I/O口输出的控制信号的相位差Δt及脉宽T可调，其中，相位差Δt＞0，脉宽T＜帧周期TV，并且，脉宽T的大小，决定了OLED像素单元中的有机发光二极管oled在一个帧周期内的发光时间，即决定了OLED像素单元中的有机发光二极管oled在一个帧周期内处于发光状态的保持时间（即脉宽T=保持时间t）。本实施例中，通过控制模块30输出相应的控制信号对各行OLED像素单元中的有机发光二极管oled的发光状态分别进行控制，可实现类似CRT电视机的发光特性。若脉宽T =3ms左右（即保持时间t=3左右），则可以实现完全等同于CRT电视机的发光特色（CRT电视机的发光特性是某一个像素的荧光粉被激发后，该像素在一个帧周期内从被激发到完全不发光，仅3ms左右），从而实现了改善AM-OLED电视机在重现运动画面时的拖尾模糊效应的目的。
图4是本发明OLED像素驱动电路一实施例的驱动时序图。一并参照图3和图4，Hsync为单片机MCU的行扫描同步信号sync，IO1为单片机MCU的I/O1口输出的控制信号，IO2为单片机MCU的I/O2口输出的控制信号，IO1080为单片机MCU的I/O1080口输出的控制信号（单片机MCU的I/O3口至I/O1079口输出的控制信号，图未示）；Power L1为第1行OLED像素单元的电源线Power Line1的供电信号，Power L2为第2行OLED像素单元的电源线Power Line2的供电信号，Power L1080为第1080行OLED像素单元的电源线Power Line1080的供电信号（第3行至第1079行OLED像素单元的电源线的供电信号，图未示）；Δt为单片机MCU的各I/O口输出的控制信号的相位差；T为单片机MCU的各I/O口输出的控制信号的脉宽。
图5是本发明OLED像素驱动电路中单个OLED像素单元的扫描驱动波形图。一并参照图3和图5，VScan为图3中扫描线Scan Line1的扫描信号，VData为图3中数据线Data Line1的图像数据信号，Power L1为图3中电源线Power Line1的供电信号，Ioled为图3中有机发光二极管oled的电流信号，TV为帧周期，T为单片机MCU的各I/O口输出的控制信号的脉宽。当扫描线Scan Line1的扫描信号VScan到来且为高电平时，第一NMOS管Q1导通，此时数据线Data Line1的图像数据信号VData通过第一NMOS管Q1给充电电容C1充电，当充电电容C1的电压达到第二NMOS管Q2的开启电压时，第二NMOS管Q2导通，当第二NMOS管Q2导通且所述供电电源输入端VDD与所述电源线Power Line1为连通状态时（即单片机MCU的I/O1口输出的控制信号为高电平时，也即所述电子开关SW1为闭合状态时），所述供电电源输入端VDD的供电电压经电源线Power Line1，通过第二NMOS管Q2加到有机发光二极管oled的阳极（对应电源线Power Line1的供电信号Power L1为高电平时），使得有机发光二极管oled中有电流Ioled流过，从而使得有机发光二极管Ioled发光工作。经过时间T（T为单片机MCU输出的控制信号的脉宽T，脉宽T＜帧周期TV）后，电源线Power Line1的供电信号Power L1为低电平时（即单片机MCU的I/O1口输出的控制信号为低电平时），供电电源输入端VDD的供电电压不能通过第二NMOS管Q2加到有机发光二极管oled上，从而使得有机发光二极管oled不发光。即本实施例OLED像素驱动电路中各OLED像素单元中的有机发光二极管oled的发光时间（也即所述OLED像素单元的发光时间）由单片机MCU输出的控制信号的脉宽T（脉宽T＜帧周期TV）决定，即本实施例OLED像素驱动电路相对于现有技术中OLED像素保持型驱动电路，有机发光二极管oled的发光保持时间由原来的帧周期TV减小为T（T＜帧周期TV）。同时，由于在一个帧周期TV内，有机发光二极管oled在（TV-T）的时间内是不消耗电能的，因此，本实施例OLED像素驱动电路还实现了节能的目的。
另外，本实施例OLED像素驱动电路，通过对图3中单片机MCU输出的控制信号的相位差Δt及脉宽T进行适当的调整，将图3所示OLED像素驱动电路的OLED像素单元按行分成多个区域进行扫描驱动，便可以实现相当于TFT LCD电视机的多区域背光扫描功能（属于现有技术，此处不再赘述）。本实施例中以分成八个区域为例来说明，具体地，将1到1080行，每135行的相位差Δt设置成Δt=0，每135行的脉宽T（即上述保持时间t）设置为相同，即图3中单片机MCU输出的控制信号IO1至IO135相同，单片机MCU输出的控制信号IO136至IO270相同，单片机MCU输出的控制信号IO946至IO1080相同；电源线Power Line1至Power Line135的供电信号相同（也即Power L1至Power L135相同），电源线Power Line136至Power Line270的供电信号相同（也即Power L136至Power L270相同），电源线Power Line946至Power Line1080的供电信号相同（也即Power L946至Power L1080相同）。图6是本发明OLED像素驱动电路的八区域扫描驱动时序图，本实施例OLED像素驱动电路按照图6所示的八区域扫描驱动时序图对各区域的OLED像素单元进行扫描驱动，同样可以达到改善重现运动画面时的拖尾模糊效应的目的。
本实施例提供的OLED像素驱动电路，通过控制模块中的单片机MCU的I/O口输出相应的开关控制信号至各电子开关的控制端，从而控制供电电源输入端与各行OLED像素单元的电源线的连通与断开，进而实现供电电源输入端对各行OLED像素单元的供电，使得各OLED像素单元中的有机发光二极管oled的发光保持时间由原来的帧周期Tv减小为T（T＜帧周期TV），从而极大地改善了AM-OLED电视机在重现运动画面时的拖尾模糊效应；同时，本实施例OLED像素驱动电路还具有结构简单及易实现的优点。
本发明还提供一种电视机，该电视机包括OLED像素驱动电路，该OLED像素驱动电路的电路结构可参照上述实施例，在此不再赘述。理所应当地，由于本实施例的电视机采用了上述OLED像素驱动电路的技术方案，因此该电视机具有上述OLED像素驱动电路所有的有益效果。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (20)

  1. 一种OLED像素驱动电路，其特征在于，包括呈矩阵设置的若干
    OLED像素单元、与每一行所述OLED像素单元对应连接的扫描线、与每一列所述OLED像素单元对应连接的数据线、与每一行所述OLED像素单元对应连接的电源线、及分别与各所述电源线连接的用于分别对各所述OLED像素单元的发光时间进行控制的控制模块。
  2. 如权利要求1所述的OLED像素驱动电路，其特征在于，所述控制模块包括供电电源输入端、主控单元及开关单元；其中，
    所述开关单元的一端与各所述电源线连接，所述开关单元的另一端与所述供电电源输入端连接，所述开关单元的控制端与所述主控单元连接；
    所述主控单元输出开关控制信号至所述开关单元的控制端，所述开关单元根据所述开关控制信号控制所述供电电源输入端与各所述电源线的连通与断开状态，进而控制各所述OLED像素单元的发光时间。
  3. 如权利要求2所述的OLED像素驱动电路，其特征在于，所述开关单元包括与所述电源线一一对应连接的电子开关，所述电子开关的一端与一所述电源线连接，所述电子开关的另一端与所述供电电源输入端连接，所述电子开关的控制端与所述主控单元的控制信号输出端一一对应连接。
  4. 如权利要求2所述的OLED像素驱动电路，其特征在于，所述控制各所述OLED像素单元的发光时间包括：所述主控单元输出的开关控制信号的脉宽T小于所述OLED像素驱动电路帧周期TV。
  5. 如权利要求4所述的OLED像素驱动电路，其特征在于，所述OLED像素单元包括OLED及用于驱动所述OLED的像素驱动单元；所述像素驱动单元包括第一NMOS管、第二NMOS管及充电电容；其中，所述第一NMOS管的栅极与所述扫描线连接，所述第一NMOS管的漏极与所述数据线连接，所述第一NMOS管的源极分别与所述充电电容的第一端及所述第二NMOS管的栅极连接；所述充电电容的第二端接地；所述第二NMOS管的漏极与所述电源线连接，所述第二NMOS管的源极与所述OLED的阳极连接；所述OLED的阴极接地；
    当所述扫描线的扫描信号为高电平时，所述第一NMOS管导通，所述数据线的图像数据信号在所述第一NMOS管导通时对所述充电电容进行充电，当所述充电电容的电压达到所述第二NMOS管的开启电压时，所述第二NMOS管导通，当所述第二NMOS管导通且所述供电电源输入端与所述电源线为连通状态时，所述供电电源输入端的供电电压加到所述OLED的阳极，所述OLED发光工作。
  6. 如权利要求5所述的OLED像素驱动电路，其特征在于，所述主控单元为单片机。
  7. 如权利要求6所述的OLED像素驱动电路，其特征在于，所述电子开关的控制端与所述单片机的I/O口一一对应连接。
  8. 如权利要求1所述的OLED像素驱动电路，其特征在于，所述像素驱动电路包括1920×1080个OLED像素单元。
  9. 如权利要求1所述的OLED像素驱动电路，其特征在于，所述OLED像素单元按行分成多个区域进行扫描驱动。
  10. 如权利要求9所述的OLED像素驱动电路，其特征在于，所述OLED像素单元按行分成八个区域进行扫描驱动。
  11. 一种电视机，其特征在于，所述电视机包括OLED像素驱动电路，所述OLED像素驱动电路包括呈矩阵设置的若干OLED像素单元、与每一行所述OLED像素单元对应连接的扫描线、与每一列所述OLED像素单元对应连接的数据线、与每一行所述OLED像素单元对应连接的电源线、及分别与各所述电源线连接的用于分别对各所述OLED像素单元的发光时间进行控制的控制模块。
  12. 如权利要求11所述的电视机，其特征在于，所述控制模块包括供电电源输入端、主控单元及开关单元；其中，
    所述开关单元的一端与各所述电源线连接，所述开关单元的另一端与所述供电电源输入端连接，所述开关单元的控制端与所述主控单元连接；
    所述主控单元输出开关控制信号至所述开关单元的控制端，所述开关单元根据所述开关控制信号控制所述供电电源输入端与各所述电源线的连通与断开状态，进而控制各所述OLED像素单元的发光时间。
  13. 如权利要求12所述的电视机，其特征在于，所述开关单元包括与所述电源线一一对应连接的电子开关，所述电子开关的一端与一所述电源线连接，所述电子开关的另一端与所述供电电源输入端连接，所述电子开关的控制端与所述主控单元的控制信号输出端一一对应连接。
  14. 如权利要求12所述的电视机，其特征在于，所述控制各所述OLED像素单元的发光时间包括：所述主控单元输出的开关控制信号的脉宽T小于所述OLED像素驱动电路帧周期TV。
  15. 如权利要求14所述的电视机，其特征在于，所述OLED像素单元包括OLED及用于驱动所述OLED的像素驱动单元；所述像素驱动单元包括第一NMOS管、第二NMOS管及充电电容；其中，所述第一NMOS管的栅极与所述扫描线连接，所述第一NMOS管的漏极与所述数据线连接，所述第一NMOS管的源极分别与所述充电电容的第一端及所述第二NMOS管的栅极连接；所述充电电容的第二端接地；所述第二NMOS管的漏极与所述电源线连接，所述第二NMOS管的源极与所述OLED的阳极连接；所述OLED的阴极接地；
    当所述扫描线的扫描信号为高电平时，所述第一NMOS管导通，所述数据线的图像数据信号在所述第一NMOS管导通时对所述充电电容进行充电，当所述充电电容的电压达到所述第二NMOS管的开启电压时，所述第二NMOS管导通，当所述第二NMOS管导通且所述供电电源输入端与所述电源线为连通状态时，所述供电电源输入端的供电电压加到所述OLED的阳极，所述OLED发光工作。
  16. 如权利要求15所述的电视机，其特征在于，所述主控单元为单片机。
  17. 如权利要求16所述的电视机，其特征在于，所述电子开关的控制端与所述单片机的I/O口一一对应连接。
  18. 如权利要求11所述的电视机，其特征在于，所述像素驱动电路包括1920×1080个OLED像素单元。
  19. 如权利要求11所述的电视机，其特征在于，所述OLED像素单元按行分成多个区域进行扫描驱动。
  20. 如权利要求19所述的电视机，其特征在于，所述OLED像素单元按行分成八个区域进行扫描驱动。
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