WO2017041344A1 - 提高画面对比度的oled驱动系统及驱动方法 - Google Patents

提高画面对比度的oled驱动系统及驱动方法 Download PDF

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Publication number
WO2017041344A1
WO2017041344A1 PCT/CN2015/091718 CN2015091718W WO2017041344A1 WO 2017041344 A1 WO2017041344 A1 WO 2017041344A1 CN 2015091718 W CN2015091718 W CN 2015091718W WO 2017041344 A1 WO2017041344 A1 WO 2017041344A1
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Prior art keywords
thin film
electrically connected
film transistor
display panel
oled
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PCT/CN2015/091718
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English (en)
French (fr)
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陈小龙
吴智豪
陈明锋
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深圳市华星光电技术有限公司
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Priority to US14/787,771 priority Critical patent/US9881553B2/en
Publication of WO2017041344A1 publication Critical patent/WO2017041344A1/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
    • G09G3/3258—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 voltage across 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
    • 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
    • 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
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0871—Several active elements per pixel in active matrix panels with level shifting
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention relates to the field of display technologies, and in particular, to an OLED driving system and a driving method for improving picture contrast.
  • OLED Organic Light Emitting Display
  • OLED Organic Light Emitting Display
  • the OLED display device has a plurality of pixels arranged in an array, and the organic light emitting diodes are driven to emit light through the pixel driving circuit.
  • FIG. 1 shows a 3T1C pixel driving circuit of an OLED, comprising: a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, a storage capacitor Cst, and an organic light emitting diode D.
  • the 3T1C pixel driving circuit adds the third thin film transistor T3 compared to the conventional 2T1C pixel driving circuit.
  • the second thin film transistor T2 is a driving thin film transistor, and the gate and the source of the second thin film transistor T2 are respectively connected to the first node A and the second node S; the first thin film transistor T1 is used for the first node A and the second The gate of the thin film transistor T2 is charged; the gate of the third thin film transistor T3 is connected to the discharge control signal DSC, the source is electrically connected to the first node A, the drain is connected to a reference voltage Vref, and the third thin film transistor T3 is used. The gate of the first node A, that is, the second thin film transistor T2, is discharged.
  • the gate of the third thin film transistor T3 When the gate of the third thin film transistor T3 is turned on, the point A is discharged, and after the voltage is stabilized, the voltage at point A is about the reference voltage Vref, which acts as a discharge to the organic light emitting diode D, that is, by controlling the reference voltage Vref.
  • the size is used to control the voltage value after discharge at point A.
  • V GS is the gate-to-source voltage of the second thin film transistor T2
  • Vth is the threshold voltage of the second thin film transistor T2
  • V A is The voltage of one node A is the gate voltage of the second thin film transistor T2
  • V S is the voltage of the second node S, that is, the source voltage of the second thin film transistor T2.
  • the Pulse-Width Modulation (PWM) driving method controls the charging and discharging times of each sub-field in a frame by controlling the time when the first thin film transistor T1 and the third thin film transistor T3 are turned on.
  • Length combined with the human eye's perception of brightness is time The principle of integration between the two, you can use the digital voltage (ie two Gamma voltage) to display images of different grayscale brightness.
  • the reference voltage Vref of all the OLED pixel driving circuits is generally set to a certain fixed value, that is, the reference voltage Vref of each row of pixel driving circuits is equal.
  • the display brightness of the OLED Luminance
  • An object of the present invention is to provide an OLED driving system capable of improving picture contrast and ensuring picture display quality.
  • Another object of the present invention is to provide an OLED driving method capable of improving picture contrast and ensuring picture display quality.
  • the present invention provides an OLED driving system for improving picture contrast, comprising: an image input module electrically connected in sequence, a brightness calculation module, a power management module, and an OLED display panel;
  • the OLED display panel has a plurality of pixels arranged in an array, and a pixel driving circuit is disposed in each pixel;
  • the pixel driving circuit includes a first thin film transistor, a second thin film transistor, a third thin film transistor, a storage capacitor, And an organic light emitting diode
  • the second thin film transistor is for driving an organic light emitting diode
  • the first thin film transistor is used for charging a gate of the second thin film transistor
  • the third thin film transistor is used for a second thin film
  • the gate of the third thin film transistor is connected to the discharge control signal
  • the source is electrically connected to the gate of the second thin film transistor
  • the drain is electrically connected to the reference voltage line corresponding to the row of the pixel;
  • the OLED display panel is equally divided into a plurality of display partitions in a vertical direction, and each display partition includes pixels of equal number of rows;
  • the image input module is configured to provide image data of a frame of picture to the brightness calculation module;
  • the brightness calculation module is configured to calculate an average pixel brightness corresponding to each display partition in the OLED display panel, and transmit an average pixel brightness of each display partition to the power management module;
  • the power management module is configured to respectively give a reference voltage different from each display partition according to an average pixel brightness of each display partition in the OLED display panel, and insert a reference voltage of each display partition into a reference of a middle row pixel of the corresponding display partition. Voltage line.
  • the OLED driving system for improving the contrast of the screen further comprises: an image compensation module electrically connected to the image input module and the brightness calculation module, a timing controller electrically connected to the image compensation module, and an electrical connection timing controller and the OLED display panel Source driver
  • the image compensation module is configured to receive image data of a frame image provided by the image input module, and an average pixel brightness corresponding to each display partition in the OLED display panel calculated by the brightness calculation module, according to each display partition in the OLED display panel
  • the average pixel brightness compensates the image data of the one frame picture, and the compensated image data is sequentially sent to the timing controller, the source driver, and the OLED display panel.
  • the number of divided display partitions of the OLED display panel is determined according to the resolution of the OLED display panel.
  • the gate of the first thin film transistor is electrically connected to the scan line corresponding to the row of the pixel, the source is electrically connected to the data line corresponding to the column of the pixel, and the drain is electrically connected to the first node;
  • the second thin film transistor is The gate is electrically connected to the first node, the source is electrically connected to the second node, and the drain is connected to the positive voltage of the power source; one end of the storage capacitor is electrically connected to the first node, and the other end is electrically connected to the second node.
  • a drain of the thin film transistor; an anode of the organic light emitting diode is electrically connected to the second node, and the cathode is connected to a negative voltage of the power source.
  • the invention also provides an OLED driving method for improving picture contrast, which comprises the following steps:
  • Step 1 Providing an OLED driving system
  • the OLED driving system includes: an image input module electrically connected in sequence, a brightness calculation module, a power management module, and an OLED display panel;
  • the OLED display panel has a plurality of pixels arranged in an array, and a pixel driving circuit is disposed in each pixel;
  • the pixel driving circuit includes a first thin film transistor, a second thin film transistor, a third thin film transistor, a storage capacitor, And an organic light emitting diode
  • the second thin film transistor is for driving an organic light emitting diode
  • the first thin film transistor is used for charging a gate of the second thin film transistor
  • the third thin film transistor is used for a second thin film
  • the gate of the third thin film transistor is connected to the discharge control signal
  • the source is electrically connected to the gate of the second thin film transistor
  • the drain is electrically connected to the reference voltage line corresponding to the row of the pixel;
  • the OLED display panel is equally divided into a plurality of display partitions in a vertical direction, and each display partition includes pixels of equal number of rows;
  • Step 2 The image input module provides image data of a frame image to the brightness calculation module, and the brightness calculation module calculates an average pixel brightness corresponding to each display partition in the OLED display panel, and transmits average pixel brightness of each display partition.
  • a power management module the power management module according to the average pixel brightness of each display partition in the OLED display panel correspondingly gives a reference voltage different from each display partition, and respectively inserts the reference voltage of each display partition into the middle row of the corresponding display partition The reference voltage line of the pixel.
  • the OLED driving system provided in the step 1 further includes: an image compensation module electrically connected to the image input module and the brightness calculation module, a timing controller electrically connected to the image compensation module, and Electrically connecting the timing controller with the source driver of the OLED display panel;
  • the OLED driving method for improving the contrast of the screen further includes the step 3: the image compensation module receives the image data of one frame of the image provided by the image input module, and the average pixel corresponding to each display partition in the OLED display panel calculated by the brightness calculation module. Brightness, the image data of the one frame is compensated according to the average pixel brightness of each display partition in the OLED display panel, and the compensated image data is sequentially sent to the timing controller, the source driver, and the OLED display panel.
  • the gate of the first thin film transistor is electrically connected to the scan line corresponding to the row of the pixel, the source is electrically connected to the data line corresponding to the column of the pixel, and the drain is electrically connected to the first node;
  • the second thin film transistor is The gate is electrically connected to the first node, the source is electrically connected to the second node, and the drain is connected to the positive voltage of the power source; one end of the storage capacitor is electrically connected to the first node, and the other end is electrically connected to the second node.
  • a drain of the thin film transistor; an anode of the organic light emitting diode is electrically connected to the second node, and the cathode is connected to a negative voltage of the power source.
  • the invention also provides an OLED driving system for improving picture contrast, comprising: an image input module electrically connected in sequence, a brightness calculation module, a power management module, and an OLED display panel;
  • the OLED display panel has a plurality of pixels arranged in an array, and a pixel driving circuit is disposed in each pixel;
  • the pixel driving circuit includes a first thin film transistor, a second thin film transistor, a third thin film transistor, a storage capacitor, And an organic light emitting diode
  • the second thin film transistor is for driving an organic light emitting diode
  • the first thin film transistor is used for charging a gate of the second thin film transistor
  • the third thin film transistor is used for a second thin film
  • the gate of the third thin film transistor is connected to the discharge control signal
  • the source is electrically connected to the gate of the second thin film transistor
  • the drain is electrically connected to the reference voltage line corresponding to the row of the pixel;
  • the OLED display panel is equally divided into a plurality of display partitions in a vertical direction, and each display partition includes pixels of equal number of rows;
  • the image input module is configured to provide image data of a frame of picture to the brightness calculation module;
  • the brightness calculation module is configured to calculate an average pixel brightness corresponding to each display partition in the OLED display panel, and transmit an average pixel brightness of each display partition to the power management module;
  • the power management module is configured to respectively give a reference voltage different from each display partition according to an average pixel brightness of each display partition in the OLED display panel, and insert a reference voltage of each display partition into a reference of a middle row pixel of the corresponding display partition. Voltage line
  • the method further includes: an image compensation module electrically connected to the image input module and the brightness calculation module, a timing controller electrically connected to the image compensation module, and a source driver of the electrically connected timing controller and the OLED display panel;
  • the image compensation module is configured to receive image data of a frame image provided by the image input module, and an average pixel brightness corresponding to each display partition in the OLED display panel calculated by the brightness calculation module, according to each display partition in the OLED display panel
  • the average pixel brightness compensates the image data of the one frame picture, and the compensated image data is sequentially sent to the timing controller, the source driver, and the OLED display panel;
  • the number of the display partitions of the OLED display panel is determined according to the resolution of the OLED display panel
  • the gate of the first thin film transistor is electrically connected to the scan line corresponding to the row of the pixel, the source is electrically connected to the data line corresponding to the column of the pixel, and the drain is electrically connected to the first node; the second film The gate of the transistor is electrically connected to the first node, the source is electrically connected to the second node, and the drain is connected to the positive voltage of the power source; one end of the storage capacitor is electrically connected to the first node, and the other end is electrically connected to the second node.
  • a drain of the second thin film transistor; an anode of the organic light emitting diode is electrically connected to the second node, and the cathode is connected to a negative voltage of the power source.
  • the invention provides an OLED driving system and a driving method for improving picture contrast
  • the OLED display panel is equally divided into a plurality of display partitions in a vertical direction
  • the brightness calculation module calculates corresponding to each of the OLED display panels. Displaying the average pixel brightness of the partition, on the one hand, according to the average pixel brightness of each display partition in the OLED display panel, the reference voltage of each display partition is correspondingly given by the power management module, and the reference voltages of the display partitions are respectively inserted into corresponding Displaying the reference voltage line of the middle row pixel of the partition, so that the reference voltage of each display partition is different, and the screen contrast can be improved.
  • the image compensation module is used to image the image of one frame according to the average pixel brightness of each display partition in the OLED display panel. The data is compensated to ensure the quality of the picture display.
  • FIG. 1 is a schematic diagram of a conventional OLED 3T1C pixel driving circuit
  • FIG. 2 is a graph showing the relationship between gray scale and brightness of an OLED display screen in the prior art
  • FIG. 3 is an architectural diagram of an OLED driving system for improving picture contrast according to the present invention.
  • FIG. 4 is an example of an OLED display panel dividing display partition and a reference voltage inserted corresponding to each display partition in an OLED driving system for improving picture contrast according to the present invention
  • Figure 5 is a schematic view corresponding to the detail of B in Figure 4.
  • FIG. 6 is a graph showing the relationship between the grayscale level and the brightness of the display screen after dividing the display partition by the OLED display panel illustrated in FIG. 4;
  • FIG. 7 is a flowchart of an OLED driving method for improving picture contrast according to the present invention.
  • FIG. 8 is a timing chart of a line sync signal and a reference voltage synchronizing signal used in the OLED driving method for improving picture contrast according to the present invention.
  • the present invention firstly provides an OLED driving system for improving picture contrast, comprising: an image input module 1 , a brightness calculation module 2 , a power management module 3 , an OLED display panel 4 , which are electrically connected in sequence.
  • the image input module 1 and the image compensation module 5 of the brightness calculation module 2, the timing controller 6 electrically connected to the image compensation module 5, and the source driver 7 of the OLED display panel 4 are electrically connected to the timing controller 6.
  • the OLED display panel 4 has a plurality of pixels arranged in an array, and a pixel driving circuit is disposed in each pixel.
  • the pixel driving circuit includes a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, a storage capacitor Cst, and an organic light emitting diode D.
  • the gate of the first thin film transistor T1 is electrically connected to the scan line Gate corresponding to the row of the pixel, the source is electrically connected to the data line Data corresponding to the column of the pixel, and the drain is electrically connected to the first node A;
  • the gate of the second thin film transistor T2 is electrically connected to the first node A, the source is electrically connected to the second node S, the drain is connected to the power supply positive voltage OVdd, and the gate of the third thin film transistor T3 is connected to the discharge control.
  • the source is electrically connected to the gate of the second thin film transistor T2, and the drain is electrically connected to the reference voltage line Vref-line corresponding to the row of the pixel; one end of the storage capacitor Cst is electrically connected to the first node A, The other end is electrically connected to the drain of the second thin film transistor T2; the anode of the organic light emitting diode D is electrically connected to the second node S, and the cathode is connected to the power supply negative voltage OVss.
  • the second thin film transistor T2 is for driving the organic light emitting diode D
  • the first thin film transistor T1 is used for charging the gate of the second thin film transistor T2
  • the third thin film transistor T3 is used for the second thin film.
  • the gate of transistor T2 is discharged.
  • the 3T1C pixel driving circuit controls the opening of the first thin film transistor T1 and the third thin film transistor T3 by a PWM driving method
  • Time to control the length of charge and discharge time of each subfield in a frame, combined with the perception of brightness by the human eye is the integration principle in time, using digital voltage to display images of different grayscale brightness, changing the reference voltage line Vref-line
  • the reference voltage Vref transmitted inside, the relationship between the gray level of the picture and the brightness will also change, and the contrast of the picture can be adjusted by changing the size of the reference voltage Vref.
  • the OLED display panel 4 is equally divided into a plurality of display partitions in the vertical direction, and each display partition includes pixels of equal number of rows.
  • the number of the display partitions of the OLED display panel 4 is not limited, and may be determined according to the resolution of the OLED display panel 4. The larger the resolution, the more the number of display partitions of the OLED display panel is divided. Taking the OLED display panel 4 with a resolution of 1080 ⁇ 720 as an example, the OLED display panel 4 includes 1080 rows and 720 columns of pixels. As shown in FIG. 4, the OLED display panel 4 is equally divided into four display partitions, each of which is divided into four display partitions.
  • the display partitions each include 270 rows of pixels: display partition 1 includes pixels from row 1 to row 270, display partition 2 includes pixels from row 271 to row 540, and display partition 3 includes pixels from row 541 to row 810, and display partition 4 Includes pixels from line 811 to line 1080.
  • the image input module 1 is configured to provide image data of a frame of pictures to the brightness calculation module 2.
  • the brightness calculation module 2 is configured to calculate an average Pixel Luminance (API) corresponding to each display partition in the OLED display panel 4, and transmit the average pixel brightness of each display partition to the power management module 3.
  • API Average Pixel Luminance
  • the OLED display panel 4 with a resolution of 1080 ⁇ 720 is divided into four display partitions, and the brightness calculation module 2 calculates the average pixel brightness corresponding to the four display partitions in the OLED display panel 4 . And transmitting the average pixel brightness of the four display partitions to the power management module 3.
  • the power management module 3 is configured to respectively give reference voltages different from each other according to the average pixel brightness of each display partition in the OLED display panel 4, and respectively insert the reference voltage of each display partition into the middle row pixel of the corresponding display partition.
  • Reference voltage line Vref-line As shown in FIG. 4 , the OLED display panel 4 with a resolution of 1080 ⁇ 720 is divided into four display partitions. The power management module 3 correspondingly displays the average pixel brightness of the four display partitions in the OLED display panel 4 .
  • Vref4 is inserted into the reference voltage line Vref-line 945 which displays the middle row pixel of the partition 4, that is, the pixel of the 945th row.
  • R there is an equivalent equivalent resistance R between the adjacent two reference voltage lines Vref-line corresponding to the adjacent two rows of pixels, and then the reference voltage of each display partition is respectively inserted into the reference of the middle row pixels of each display partition.
  • the voltage line can linearly change the reference voltage between the pixels of the middle row of the two adjacent display partitions, and the OLED display panel 4 with a resolution of 1080 ⁇ 720 is divided into four display partitions, as shown in FIG. 4 .
  • the reference voltage of the pixels of the 135th to 405th rows, the reference voltage of the pixels of the 405th to 675th rows, and the reference voltage of the pixels of the 675th to 945th rows are linearly changed, thereby avoiding the brightness between the display sections.
  • the situation of jumping is linearly changed.
  • the OLED display panel 4 with a resolution of 1080 ⁇ 720 is divided into four display partitions as an example, and the reference voltage Vref4>Vref1>Vref2>Vref3 inserted in each display partition is set, as shown in FIG. 6 , gray scale and brightness.
  • the relationship curve will move upward with the increase of the reference voltage inserted in each display partition.
  • the contrast formula the contrast corresponding to partition 1 to display partition 4 is displayed:
  • the OLED display panel 4 displays the overall contrast of the picture:
  • the overall contrast of the display screen of the OLED display panel 4 is higher than the contrast of any one of the display partitions, that is, the different reference voltages of the display partitions increase the overall contrast of the display screen of the OLED display panel 4.
  • the image compensation module 5 is configured to receive image data of a frame of the image provided by the image input module 1 and an average pixel brightness calculated by the brightness calculation module 2 corresponding to each display partition in the OLED display panel 4, according to the OLED display panel.
  • the average pixel brightness of each display partition in 4 compensates the image data of the one frame picture, and sequentially sends the compensated image data to the timing controller 6, the source driver 7, and the OLED display panel 4, thereby ensuring The picture shows the quality.
  • the present invention further provides an OLED driving method for improving the contrast of a picture. As shown in FIG. 7, the method includes the following steps:
  • Step 1 providing an OLED driving system as shown in FIG. 3 and FIG. 4 combined with FIG. 1;
  • the OLED drive system includes: an image input module 1 and a brightness calculation module 2, a power management module 3, an OLED display panel 4, an image connection module 5 electrically connected to the image input module 1 and an image compensation module 5 of the brightness calculation module 2, Timing control of the electrical connection image compensation module 5
  • the device 6 is electrically connected to the timing controller 6 and the source driver 7 of the OLED display panel 4.
  • the OLED display panel 4 has a plurality of pixels arranged in an array, and a pixel driving circuit is disposed in each pixel.
  • the pixel driving circuit includes a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, a storage capacitor Cst, and an organic light emitting diode D.
  • the gate of the first thin film transistor T1 is electrically connected to the scan line Gate corresponding to the row of the pixel, the source is electrically connected to the data line Data corresponding to the column of the pixel, and the drain is electrically connected to the first node A;
  • the gate of the second thin film transistor T2 is electrically connected to the first node A, the source is electrically connected to the second node S, the drain is connected to the power supply positive voltage OVdd, and the gate of the third thin film transistor T3 is connected to the discharge control.
  • the source is electrically connected to the gate of the second thin film transistor T2, and the drain is electrically connected to the reference voltage line Vref-line corresponding to the row of the pixel; one end of the storage capacitor Cst is electrically connected to the first node A, The other end is electrically connected to the drain of the second thin film transistor T2; the anode of the organic light emitting diode D is electrically connected to the second node S, and the cathode is connected to the power supply negative voltage OVss.
  • the second thin film transistor T2 is for driving the organic light emitting diode D
  • the first thin film transistor T1 is used for charging the gate of the second thin film transistor T2
  • the third thin film transistor T3 is used for the second thin film.
  • the gate of transistor T2 is discharged.
  • the OLED display panel 4 is equally divided into a plurality of display partitions in a vertical direction, and each display partition includes pixels of an equal number of rows.
  • the number of the display partitions of the OLED display panel 4 is not limited, and may be determined according to the resolution of the OLED display panel 4. The larger the resolution, the more the number of display partitions of the OLED display panel is divided.
  • Step 2 The image input module 1 provides image data of a frame image to the brightness calculation module 2, and the brightness calculation module 2 calculates an average pixel brightness corresponding to each display area in the OLED display panel 4, and The average pixel brightness is transmitted to the power management module 3; the power management module 3 correspondingly gives reference voltages different from each other according to the average pixel brightness of each display partition in the OLED display panel 4, and respectively refers to each display partition. The voltage is inserted into the reference voltage line Vref-line corresponding to the pixel of the middle row of the display partition.
  • Step 3 The image compensation module 5 receives the image data of one frame provided by the image input module 1 and the average pixel brightness calculated by the brightness calculation module 2 corresponding to each display partition in the OLED display panel 4, according to the OLED display panel 4 The average pixel brightness of each display partition compensates the image data of the one frame picture, and the compensated image data is sequentially sent to the timing controller 6, the source driver 7, and the OLED display panel 4.
  • the steps 2 and 3 are repeated, after the driving and displaying of one frame is completed, and then Drive and display the next framed picture.
  • the reference voltages of the display partitions are different according to the average pixel brightness of each display partition in the OLED display panel 4 by the power management module 3, and respectively
  • the reference voltage of the display partition is inserted into the reference voltage line corresponding to the middle row pixel of the display partition, so that the reference voltages of the display partitions are different, the screen contrast of each display partition is also different, and the overall contrast of the display screen of the OLED display panel 4 is improved;
  • the image compensation module 5 compensates the image data of one frame according to the average pixel brightness of each display partition in the OLED display panel 4 to ensure the picture display quality.
  • each display partition reference voltage hop occurs after the line sync signal Frame_de of the (N-1)th frame (N is a positive integer greater than 1) is pulled low and the line field synchronization of the Nth frame is performed.
  • the time when the line sync signal Frame_de corresponding to the next subfield is at a high potential is halved with respect to the time when the line sync signal Frame_de corresponding to the previous subfield is at a high potential.
  • the reference voltage synchronizing signal Vref_de is opposite to the potential of the line sync signal Frame_de.
  • the OLED driving system and the driving method for improving the contrast of the screen of the present invention divide the OLED display panel into a plurality of display partitions in the vertical direction, and calculate the average of the display partitions corresponding to the OLED display panel by the brightness calculation module.
  • the pixel brightness is obtained by the power management module according to the average pixel brightness of each display partition in the OLED display panel, and the reference voltages of the display partitions are respectively inserted into the corresponding display partition middle row.
  • the reference voltage line of the pixel makes the reference voltage of each display partition different, and can improve the screen contrast.
  • the image compensation module compensates the image data of one frame according to the average pixel brightness of each display partition in the OLED display panel. Guarantee the quality of the picture display.

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Abstract

一种提高画面对比度的OLED驱动系统及驱动方法，将OLED显示面板（4）沿竖直方向平均划分为数个显示分区，通过亮度计算模块（2）计算对应于OLED显示面板（4）内各显示分区的平均像素亮度，一方面通过电源管理模块（3）来根据OLED显示面板（4）内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压（Vref），并分别将各显示分区的参考电压（Vref）插入对应显示分区中间行像素的参考电压线（Vref-line），使得各显示分区的参考电压（Vref）不同，能够提高画面对比度，另一方面通过图像补偿模块（5）来根据OLED显示面板（4）内各显示分区的平均像素亮度对一帧画面的图像数据进行补偿，保证画面显示质量。

Description

提高画面对比度的OLED驱动系统及驱动方法 技术领域
本发明涉及显示技术领域，尤其涉及一种提高画面对比度的OLED驱动系统及驱动方法。
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显示装置具有呈阵列式排布的多个像素，通过像素驱动电路驱动有机发光二极管发光。图1所示为OLED的一种3T1C像素驱动电路，包括：第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、存储电容Cst、及有机发光二极管D。相比于传统的2T1C像素驱动电路，该3T1C像素驱动电路增加了第三薄膜晶体管T3。第二薄膜晶体管T2为驱动薄膜晶体管，该第二薄膜晶体管T2的栅极、源极分别连接于第一节点A、第二节点S；第一薄膜晶体管T1用于对第一节点A即第二薄膜晶体管T2的栅极进行充电；第三薄膜晶体管T3的栅极接入放电控制信号DSC，源极电性连接第一节点A，漏极接入一参考电压Vref，该第三薄膜晶体管T3用于对第一节点A即第二薄膜晶体管T2的栅极进行放电。当第三薄膜晶体管T3的栅极打开后，对A点放电，电压稳定后，A点电压约为参考电压Vref，起到了对有机发光二极管D的放电作用，也就是说可以通过控制参考电压Vref的大小来控制A点放电后的电压值。
计算流经有机发光二极管的电流I的公式为：
I＝k(VGS-Vth)2＝k(VA-VS-Vth)2
其中，k为驱动薄膜晶体管即第二薄膜晶体管T2的本征导电因子，VGS为第二薄膜晶体管T2的栅源极电压，Vth为第二薄膜晶体管T2的阀值电压，VA为第一节点A的电压即第二薄膜晶体管T2的栅极电压，VS为第二节点S的电压即第二薄膜晶体管T2的源极电压。
脉宽调制(Pulse-Width Modulation，PWM)驱动方式通过控制第一薄膜晶体管T1和第三薄膜晶体管T3打开的时间来控制一帧(frame)画面中各个子场(Sub frame)充、放电时间的长短，结合人眼对亮度的感知是时 间上的积分原理，可使用数位电压(即两个Gamma电压)来显示不同灰阶亮度的影像。
现有技术一般将所有OLED像素驱动电路的参考电压Vref均设为某一固定值，即各行像素驱动电路的参考电压Vref均相等，此种情况下，如图2所示，OLED的显示亮度(Luminance)随着显示画面灰阶等级(Gray Level)的增大由第一亮度L1增大到第二亮度L2，显示画面的对比度Contrast可由公式Contrast＝L2/L1计算得到，最终获得的画面对比度较低。
发明内容
本发明的目的在于提供一种OLED驱动系统，能够提高画面对比度，保证画面显示质量。
本发明的目的还在于提供一种OLED驱动方法，能够提高画面对比度，保证画面显示质量。
为实现上述目的，本发明提供一种提高画面对比度的OLED驱动系统，包括：依次电性连接的图像输入模块、亮度计算模块、电源管理模块、及OLED显示面板；
所述OLED显示面板具有呈阵列式排布的多个像素，每一像素内设置一像素驱动电路；所述像素驱动电路包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容、及有机发光二极管，所述第二薄膜晶体管用于驱动有机发光二级管，所述第一薄膜晶体管用于对第二薄膜晶体管的栅极充电，所述第三薄膜晶体管用于对第二薄膜晶体管的栅极放电；所述第三薄膜晶体管的栅极接入放电控制信号，源极电性连接第二薄膜晶体管的栅极，漏极电性连接像素所在行对应的参考电压线；所述OLED显示面板沿竖直方向被平均划分为数个显示分区，每个显示分区内包括相等行数的像素；
所述图像输入模块用于向亮度计算模块提供一帧画面的图像数据；
所述亮度计算模块用于计算对应于OLED显示面板内各显示分区的平均像素亮度，并将各显示分区的平均像素亮度传输给电源管理模块；
所述电源管理模块用于根据OLED显示面板内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线。
所述提高画面对比度的OLED驱动系统还包括：电性连接图像输入模块与亮度计算模块的图像补偿模块、电性连接图像补偿模块的时序控制器、及电性连接时序控制器与OLED显示面板的源极驱动器；
所述图像补偿模块用于接收图像输入模块所提供的一帧画面的图像数据、以及亮度计算模块计算出的对应于OLED显示面板内各显示分区的平均像素亮度，根据OLED显示面板内各显示分区的平均像素亮度对所述一帧画面的图像数据进行补偿，并将补偿后的图像数据依序送入时序控制器、源极驱动器、及OLED显示面板。
所述OLED显示面板划分显示分区的数量根据OLED显示面板的解析度来进行确定。
所述第一薄膜晶体管的栅极电性连接像素所在行对应的扫描线，源极电性连接像素所在列对应的数据线，漏极电性连接于第一节点；所述第二薄膜晶体管的栅极电性连接于第一节点，源极电性连接于第二节点，漏极接入电源正电压；所述存储电容的一端电性连接于第一节点，另一端电性连接于第二薄膜晶体管的漏极；所述有机发光二极管的阳极电性连接于第二节点，阴极接入电源负电压。本发明还提供一种提高画面对比度的OLED驱动方法，其特征在于，包括如下步骤：
步骤1、提供一OLED驱动系统；
所述OLED驱动系统包括：依次电性连接的图像输入模块、亮度计算模块、电源管理模块、及OLED显示面板；
所述OLED显示面板具有呈阵列式排布的多个像素，每一像素内设置一像素驱动电路；所述像素驱动电路包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容、及有机发光二极管，所述第二薄膜晶体管用于驱动有机发光二级管，所述第一薄膜晶体管用于对第二薄膜晶体管的栅极充电，所述第三薄膜晶体管用于对第二薄膜晶体管的栅极放电；所述第三薄膜晶体管的栅极接入放电控制信号，源极电性连接第二薄膜晶体管的栅极，漏极电性连接像素所在行对应的参考电压线；所述OLED显示面板沿竖直方向被平均划分为数个显示分区，每个显示分区内包括相等行数的像素；
步骤2、所述图像输入模块向亮度计算模块提供一帧画面的图像数据，所述亮度计算模块计算对应于OLED显示面板内各显示分区的平均像素亮度，并将各显示分区的平均像素亮度传输给电源管理模块；所述电源管理模块根据OLED显示面板内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线。
所述步骤1提供的OLED驱动系统还包括：电性连接图像输入模块与亮度计算模块的图像补偿模块、电性连接图像补偿模块的时序控制器、及 电性连接时序控制器与OLED显示面板的源极驱动器；
所述提高画面对比度的OLED驱动方法还包括步骤3、图像补偿模块接收图像输入模块所提供的一帧画面的图像数据、以及亮度计算模块计算出的对应于OLED显示面板内各显示分区的平均像素亮度，根据OLED显示面板内各显示分区的平均像素亮度对所述一帧画面的图像数据进行补偿，并将补偿后的图像数据依序送入时序控制器、源极驱动器、及OLED显示面板。
所述步骤2中亮度计算模块计算出的OLED显示面板内某个显示分区的平均像素亮度越大，所述电源管理模块相应给出的该显示分区的参考电压越高。
所述第一薄膜晶体管的栅极电性连接像素所在行对应的扫描线，源极电性连接像素所在列对应的数据线，漏极电性连接于第一节点；所述第二薄膜晶体管的栅极电性连接于第一节点，源极电性连接于第二节点，漏极接入电源正电压；所述存储电容的一端电性连接于第一节点，另一端电性连接于第二薄膜晶体管的漏极；所述有机发光二极管的阳极电性连接于第二节点，阴极接入电源负电压。
本发明还提供一种提高画面对比度的OLED驱动系统，包括：依次电性连接的图像输入模块、亮度计算模块、电源管理模块、及OLED显示面板；
所述OLED显示面板具有呈阵列式排布的多个像素，每一像素内设置一像素驱动电路；所述像素驱动电路包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容、及有机发光二极管，所述第二薄膜晶体管用于驱动有机发光二级管，所述第一薄膜晶体管用于对第二薄膜晶体管的栅极充电，所述第三薄膜晶体管用于对第二薄膜晶体管的栅极放电；所述第三薄膜晶体管的栅极接入放电控制信号，源极电性连接第二薄膜晶体管的栅极，漏极电性连接像素所在行对应的参考电压线；所述OLED显示面板沿竖直方向被平均划分为数个显示分区，每个显示分区内包括相等行数的像素；
所述图像输入模块用于向亮度计算模块提供一帧画面的图像数据；
所述亮度计算模块用于计算对应于OLED显示面板内各显示分区的平均像素亮度，并将各显示分区的平均像素亮度传输给电源管理模块；
所述电源管理模块用于根据OLED显示面板内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线；
还包括：电性连接图像输入模块与亮度计算模块的图像补偿模块、电性连接图像补偿模块的时序控制器、及电性连接时序控制器与OLED显示面板的源极驱动器；
所述图像补偿模块用于接收图像输入模块所提供的一帧画面的图像数据、以及亮度计算模块计算出的对应于OLED显示面板内各显示分区的平均像素亮度，根据OLED显示面板内各显示分区的平均像素亮度对所述一帧画面的图像数据进行补偿，并将补偿后的图像数据依序送入时序控制器、源极驱动器、及OLED显示面板；
其中，所述OLED显示面板划分显示分区的数量根据OLED显示面板的解析度来进行确定；
其中，所述第一薄膜晶体管的栅极电性连接像素所在行对应的扫描线，源极电性连接像素所在列对应的数据线，漏极电性连接于第一节点；所述第二薄膜晶体管的栅极电性连接于第一节点，源极电性连接于第二节点，漏极接入电源正电压；所述存储电容的一端电性连接于第一节点，另一端电性连接于第二薄膜晶体管的漏极；所述有机发光二极管的阳极电性连接于第二节点，阴极接入电源负电压。
本发明的有益效果：本发明提供的一种提高画面对比度的OLED驱动系统及驱动方法，将OLED显示面板沿竖直方向平均划分为数个显示分区，通过亮度计算模块计算对应于OLED显示面板内各显示分区的平均像素亮度，一方面通过电源管理模块来根据OLED显示面板内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线，使得各显示分区的参考电压不同，能够提高画面对比度，另一方面通过图像补偿模块来根据OLED显示面板内各显示分区的平均像素亮度对一帧画面的图像数据进行补偿，保证画面显示质量。
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为现有的OLED 3T1C像素驱动电路的示意图；
图2为现有技术中OLED显示画面的灰阶等级与亮度的关系曲线；
图3为本发明的提高画面对比度的OLED驱动系统的架构图；
图4为本发明的提高画面对比度的OLED驱动系统中OLED显示面板划分显示分区及对应于各显示分区插入的参考电压的一种示例；
图5为对应于图4中B处的细节示意图；
图6为图4所示例的OLED显示面板划分显示分区后显示画面的灰阶等级与亮度的关系曲线；
图7为本发明的提高画面对比度的OLED驱动方法的流程图；
图8为本发明的提高画面对比度的OLED驱动方法所用到的行场同步信号与参考电压同步信号的时序图。
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。
请同时参阅图3、图4，本发明首先提供一种提高画面对比度的OLED驱动系统，包括：依次电性连接的图像输入模块1、亮度计算模块2、电源管理模块3、OLED显示面板4、电性连接图像输入模块1与亮度计算模块2的图像补偿模块5、电性连接图像补偿模块5的时序控制器6、及电性连接时序控制器6与OLED显示面板4的源极驱动器7。
所述OLED显示面板4具有呈阵列式排布的多个像素，每一像素内设置一像素驱动电路。如图1所示，所述像素驱动电路包括第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、存储电容Cst、及有机发光二极管D。所述第一薄膜晶体管T1的栅极电性连接像素所在行对应的扫描线Gate，源极电性连接像素所在列对应的数据线Data，漏极电性连接于第一节点A；所述第二薄膜晶体管T2的栅极电性连接于第一节点A，源极电性连接于第二节点S，漏极接入电源正电压OVdd；所述第三薄膜晶体管T3的栅极接入放电控制信号DSC，源极电性连接第二薄膜晶体管T2的栅极，漏极电性连接像素所在行对应的参考电压线Vref-line；所述存储电容Cst的一端电性连接于第一节点A，另一端电性连接于第二薄膜晶体管T2的漏极；所述有机发光二极管D的阳极电性连接于第二节点S，阴极接入电源负电压OVss。所述第二薄膜晶体管T2用于驱动有机发光二级管D，所述第一薄膜晶体管T1用于对第二薄膜晶体管T2的栅极充电，所述第三薄膜晶体管T3用于对第二薄膜晶体管T2的栅极放电。该3T1C像素驱动电路通过PWM驱动方式控制第一薄膜晶体管T1和第三薄膜晶体管T3打开的 时间来控制一帧画面中各个子场充、放电时间的长短，结合人眼对亮度的感知是时间上的积分原理，使用数位电压来显示不同灰阶亮度的影像，改变参考电压线Vref-line内传输的参考电压Vref，画面灰阶等级与亮度的关系也会随之改变，可通过改变参考电压Vref的大小来调节画面的对比度。
重点地，所述OLED显示面板4沿竖直方向被平均划分为数个显示分区，每个显示分区内包括相等行数的像素。所述OLED显示面板4划分显示分区的数量不做具体限制，可根据OLED显示面板4的解析度来确定，解析度越大的OLED显示面板划分显示分区的数量越多。以解析度为1080×720的OLED显示面板4为例，即OLED显示面板4包括1080行、720列像素，如图4所示，该OLED显示面板4被平均划分为4个显示分区，每个显示分区均包括270行像素：显示分区1包括第1行至第270行像素，显示分区2包括第271行至第540行像素，显示分区3包括第541行至第810行像素，显示分区4包括第811行至第1080行像素。
所述图像输入模块1用于向亮度计算模块2提供一帧画面的图像数据。
所述亮度计算模块2用于计算对应于OLED显示面板4内各显示分区的平均像素亮度(Average Pixel Luminance,API)，并将各显示分区的平均像素亮度传输给电源管理模块3。如图4所示，以解析度为1080×720的OLED显示面板4被划分为4个显示分区为例，所述亮度计算模块2计算对应于OLED显示面板4内4个显示分区的平均像素亮度，并将4个显示分区的平均像素亮度传输给电源管理模块3。
所述电源管理模块3用于根据OLED显示面板4内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线Vref-line。如图4所示，以解析度为1080×720的OLED显示面板4被划分为4个显示分区为例，所述电源管理模块3根据OLED显示面板4内4个显示分区的平均像素亮度相应给出显示分区1的第一参考电压Vref1，并将显示分区1的第一参考电压Vref1插入显示分区1中间行像素即第135行像素的参考电压线Vref-line135；给出显示分区2的第二参考电压Vref2，并将显示分区2的第二参考电压Vref2插入显示分区2中间行像素即第405行像素的参考电压线Vref-line405；给出显示分区3的第三参考电压Vref3，并将显示分区3的第三参考电压Vref3插入显示分区3中间行像素即第675行像素的参考电压线Vref-line675；给出显示分区4的第四参考电压Vref4，并将显示分区4的第四参考电压Vref4插入显示分区4中间行像素即第945行像素的参考电压线Vref-line945。值得一提的是，结合图4与图5，由于OLED显示面板的制 程原因，相邻两行像素对应的相邻两条参考电压线Vref-line之间会有一个相等的等效电阻R，那么分别将各显示分区的参考电压插入各显示分区中间行像素的参考电压线，能够使得两相邻显示分区中间行像素之间的参考电压呈线性变化，以解析度为1080×720的OLED显示面板4被划分为4个显示分区为例，如图4所示，第135行至第405行像素的参考电压、第405行至第675行像素的参考电压、第675行至第945行像素的参考电压均呈线性变化，这样可避免各显示分区之间出现亮度跳变的情况。
由于所述OLED显示面板4内各显示分区的参考电压不同，使得各显示分区的画面对比度亦不同，OLED显示面板4显示画面的整体对比度得以提高。仍以解析度为1080×720的OLED显示面板4被划分为4个显示分区为例，设各显示分区插入的参考电压Vref4>Vref1>Vref2>Vref3，如图6所示，灰阶等级与亮度的关系曲线会随各显示分区插入的参考电压的增大而向上移，根据对比度公式，显示分区1至显示分区4分别对应的对比度：
Contrast1＝L7/L3
Contrast2＝L6/L2
Contrast3＝L5/L1
Contrast4＝L8/L4
而OLED显示面板4显示画面的整体对比度：
Contrast＝L8/L1
OLED显示面板4显示画面的整体对比度比任意一个显示分区的对比度都要高，即各显示分区不同的参考电压提高了OLED显示面板4显示画面的整体对比度。
所述图像补偿模块5用于接收图像输入模块1所提供的一帧画面的图像数据、以及亮度计算模块2计算出的对应于OLED显示面板4内各显示分区的平均像素亮度，根据OLED显示面板4内各显示分区的平均像素亮度对所述一帧画面的图像数据进行补偿，并将补偿后的图像数据依序送入时序控制器6、源极驱动器7、及OLED显示面板4，保证了画面显示质量。
在本发明的提高画面对比度的OLED驱动系统的基础上，本发明还提供一种提高画面对比度的OLED驱动方法，如图7所示，包括如下步骤：
步骤1、提供一上述如图3、图4、结合图1所示的OLED驱动系统；
所述OLED驱动系统包括：依次电性连接的图像输入模块1、亮度计算模块2、电源管理模块3、OLED显示面板4、电性连接图像输入模块1与亮度计算模块2的图像补偿模块5、电性连接图像补偿模块5的时序控制 器6、及电性连接时序控制器6与OLED显示面板4的源极驱动器7。
所述OLED显示面板4具有呈阵列式排布的多个像素，每一像素内设置一像素驱动电路。如图1所示，所述像素驱动电路包括第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、存储电容Cst、及有机发光二极管D。所述第一薄膜晶体管T1的栅极电性连接像素所在行对应的扫描线Gate，源极电性连接像素所在列对应的数据线Data，漏极电性连接于第一节点A；所述第二薄膜晶体管T2的栅极电性连接于第一节点A，源极电性连接于第二节点S，漏极接入电源正电压OVdd；所述第三薄膜晶体管T3的栅极接入放电控制信号DSC，源极电性连接第二薄膜晶体管T2的栅极，漏极电性连接像素所在行对应的参考电压线Vref-line；所述存储电容Cst的一端电性连接于第一节点A，另一端电性连接于第二薄膜晶体管T2的漏极；所述有机发光二极管D的阳极电性连接于第二节点S，阴极接入电源负电压OVss。所述第二薄膜晶体管T2用于驱动有机发光二级管D，所述第一薄膜晶体管T1用于对第二薄膜晶体管T2的栅极充电，所述第三薄膜晶体管T3用于对第二薄膜晶体管T2的栅极放电。
所述OLED显示面板4沿竖直方向被平均划分为数个显示分区，每个显示分区内包括相等行数的像素。具体地，所述OLED显示面板4划分显示分区的数量不做具体限制，可根据OLED显示面板4的解析度来确定，解析度越大的OLED显示面板划分显示分区的数量越多。
步骤2、所述图像输入模块1向亮度计算模块2提供一帧画面的图像数据，所述亮度计算模块2计算对应于OLED显示面板4内各显示分区的平均像素亮度，并将各显示分区的平均像素亮度传输给电源管理模块3；所述电源管理模块3根据OLED显示面板4内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线Vref-line。
具体地，该步骤2中亮度计算模块2计算出的OLED显示面板4内某个显示分区的平均像素亮度越大，所述电源管理模块3相应给出的该显示分区的参考电压越高。
步骤3、图像补偿模块5接收图像输入模块1所提供的一帧画面的图像数据、以及亮度计算模块2计算出的对应于OLED显示面板4内各显示分区的平均像素亮度，根据OLED显示面板4内各显示分区的平均像素亮度对所述一帧画面的图像数据进行补偿，并将补偿后的图像数据依序送入时序控制器6、源极驱动器7、及OLED显示面板4。
所述步骤2、步骤3重复进行，完成一帧画面的驱动与显示之后，接着 进行下一帧化画面的驱动与显示。
本发明的提高画面对比度的OLED驱动方法中，一方面通过电源管理模块3来根据OLED显示面板4内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线，使得各显示分区的参考电压不同，各显示分区的画面对比度亦不同，OLED显示面板4显示画面的整体对比度得以提高；另一方面通过图像补偿模块5来根据OLED显示面板4内各显示分区的平均像素亮度对一帧画面的图像数据进行补偿，保证画面显示质量。
值得一提的是，由于相邻两帧不同画面的图像数据不同，因此在相邻两帧画面的驱动过程中存在各显示分区参考电压跳变的过程。如图8所示，各显示分区参考电压跳变发生在第(N-1)帧(N为大于1的正整数)画面的行场同步信号Frame_de拉低之后且第N帧画面的行场同步信号Frame_de拉高之前；在同一帧画面中，后一子场对应的行场同步信号Frame_de处于高电位的时间相对于前一子场对应的行场同步信号Frame_de处于高电位的时间减半。参考电压同步信号Vref_de与行场同步信号Frame_de的电位相反。
综上所述，本发明的提高画面对比度的OLED驱动系统及驱动方法，将OLED显示面板沿竖直方向平均划分为数个显示分区，通过亮度计算模块计算对应于OLED显示面板内各显示分区的平均像素亮度，一方面通过电源管理模块来根据OLED显示面板内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线，使得各显示分区的参考电压不同，能够提高画面对比度，另一方面通过图像补偿模块来根据OLED显示面板内各显示分区的平均像素亮度对一帧画面的图像数据进行补偿，保证画面显示质量。
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 (9)

  1. 一种提高画面对比度的OLED驱动系统，包括：依次电性连接的图像输入模块、亮度计算模块、电源管理模块、及OLED显示面板；
    所述OLED显示面板具有呈阵列式排布的多个像素，每一像素内设置一像素驱动电路；所述像素驱动电路包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容、及有机发光二极管，所述第二薄膜晶体管用于驱动有机发光二级管，所述第一薄膜晶体管用于对第二薄膜晶体管的栅极充电，所述第三薄膜晶体管用于对第二薄膜晶体管的栅极放电；所述第三薄膜晶体管的栅极接入放电控制信号，源极电性连接第二薄膜晶体管的栅极，漏极电性连接像素所在行对应的参考电压线；所述OLED显示面板沿竖直方向被平均划分为数个显示分区，每个显示分区内包括相等行数的像素；
    所述图像输入模块用于向亮度计算模块提供一帧画面的图像数据；
    所述亮度计算模块用于计算对应于OLED显示面板内各显示分区的平均像素亮度，并将各显示分区的平均像素亮度传输给电源管理模块；
    所述电源管理模块用于根据OLED显示面板内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线。
  2. 如权利要求1所述的提高画面对比度的OLED驱动系统，还包括：电性连接图像输入模块与亮度计算模块的图像补偿模块、电性连接图像补偿模块的时序控制器、及电性连接时序控制器与OLED显示面板的源极驱动器；
    所述图像补偿模块用于接收图像输入模块所提供的一帧画面的图像数据、以及亮度计算模块计算出的对应于OLED显示面板内各显示分区的平均像素亮度，根据OLED显示面板内各显示分区的平均像素亮度对所述一帧画面的图像数据进行补偿，并将补偿后的图像数据依序送入时序控制器、源极驱动器、及OLED显示面板。
  3. 如权利要求1所述的提高画面对比度的OLED驱动系统，其中，所述OLED显示面板划分显示分区的数量根据OLED显示面板的解析度来进行确定。
  4. 如权利要求1所述的提高画面对比度的OLED驱动系统，其中，所述第一薄膜晶体管的栅极电性连接像素所在行对应的扫描线，源极电性连 接像素所在列对应的数据线，漏极电性连接于第一节点；所述第二薄膜晶体管的栅极电性连接于第一节点，源极电性连接于第二节点，漏极接入电源正电压；所述存储电容的一端电性连接于第一节点，另一端电性连接于第二薄膜晶体管的漏极；所述有机发光二极管的阳极电性连接于第二节点，阴极接入电源负电压。
  5. 一种提高画面对比度的OLED驱动方法，包括如下步骤：
    步骤1、提供一OLED驱动系统；
    所述OLED驱动系统包括：依次电性连接的图像输入模块、亮度计算模块、电源管理模块、及OLED显示面板；
    所述OLED显示面板具有呈阵列式排布的多个像素，每一像素内设置一像素驱动电路；所述像素驱动电路包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容、及有机发光二极管，所述第二薄膜晶体管用于驱动有机发光二级管，所述第一薄膜晶体管用于对第二薄膜晶体管的栅极充电，所述第三薄膜晶体管用于对第二薄膜晶体管的栅极放电；所述第三薄膜晶体管的栅极接入放电控制信号，源极电性连接第二薄膜晶体管的栅极，漏极电性连接像素所在行对应的参考电压线；所述OLED显示面板沿竖直方向被平均划分为数个显示分区，每个显示分区内包括相等行数的像素；
    步骤2、所述图像输入模块向亮度计算模块提供一帧画面的图像数据，所述亮度计算模块计算对应于OLED显示面板内各显示分区的平均像素亮度，并将各显示分区的平均像素亮度传输给电源管理模块；所述电源管理模块根据OLED显示面板内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线。
  6. 如权利要求5所述的提高画面对比度的OLED驱动方法，其中，所述步骤1提供的OLED驱动系统还包括：电性连接图像输入模块与亮度计算模块的图像补偿模块、电性连接图像补偿模块的时序控制器、及电性连接时序控制器与OLED显示面板的源极驱动器；
    所述提高画面对比度的OLED驱动方法还包括步骤3、图像补偿模块接收图像输入模块所提供的一帧画面的图像数据、以及亮度计算模块计算出的对应于OLED显示面板内各显示分区的平均像素亮度，根据OLED显示面板内各显示分区的平均像素亮度对所述一帧画面的图像数据进行补偿，并将补偿后的图像数据依序送入时序控制器、源极驱动器、及OLED显示面板。
  7. 如权利要求5所述的提高画面对比度的OLED驱动方法，其中，所述步骤2中亮度计算模块计算出的OLED显示面板内某个显示分区的平均像素亮度越大，所述电源管理模块相应给出的该显示分区的参考电压越高。
  8. 如权利要求5所述的提高画面对比度的OLED驱动方法，其中，所述第一薄膜晶体管的栅极电性连接像素所在行对应的扫描线，源极电性连接像素所在列对应的数据线，漏极电性连接于第一节点；所述第二薄膜晶体管的栅极电性连接于第一节点，源极电性连接于第二节点，漏极接入电源正电压；所述存储电容的一端电性连接于第一节点，另一端电性连接于第二薄膜晶体管的漏极；所述有机发光二极管的阳极电性连接于第二节点，阴极接入电源负电压。
  9. 一种提高画面对比度的OLED驱动系统，包括：依次电性连接的图像输入模块、亮度计算模块、电源管理模块、及OLED显示面板；
    所述OLED显示面板具有呈阵列式排布的多个像素，每一像素内设置一像素驱动电路；所述像素驱动电路包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容、及有机发光二极管，所述第二薄膜晶体管用于驱动有机发光二级管，所述第一薄膜晶体管用于对第二薄膜晶体管的栅极充电，所述第三薄膜晶体管用于对第二薄膜晶体管的栅极放电；所述第三薄膜晶体管的栅极接入放电控制信号，源极电性连接第二薄膜晶体管的栅极，漏极电性连接像素所在行对应的参考电压线；所述OLED显示面板沿竖直方向被平均划分为数个显示分区，每个显示分区内包括相等行数的像素；
    所述图像输入模块用于向亮度计算模块提供一帧画面的图像数据；
    所述亮度计算模块用于计算对应于OLED显示面板内各显示分区的平均像素亮度，并将各显示分区的平均像素亮度传输给电源管理模块；
    所述电源管理模块用于根据OLED显示面板内各显示分区的平均像素亮度相应给出各显示分区互不相同的参考电压，并分别将各显示分区的参考电压插入对应显示分区中间行像素的参考电压线；
    还包括：电性连接图像输入模块与亮度计算模块的图像补偿模块、电性连接图像补偿模块的时序控制器、及电性连接时序控制器与OLED显示面板的源极驱动器；
    所述图像补偿模块用于接收图像输入模块所提供的一帧画面的图像数据、以及亮度计算模块计算出的对应于OLED显示面板内各显示分区的平均像素亮度，根据OLED显示面板内各显示分区的平均像素亮度对所述一帧画面的图像数据进行补偿，并将补偿后的图像数据依序送入时序控制器、 源极驱动器、及OLED显示面板；
    其中，所述OLED显示面板划分显示分区的数量根据OLED显示面板的解析度来进行确定；
    其中，所述第一薄膜晶体管的栅极电性连接像素所在行对应的扫描线，源极电性连接像素所在列对应的数据线，漏极电性连接于第一节点；所述第二薄膜晶体管的栅极电性连接于第一节点，源极电性连接于第二节点，漏极接入电源正电压；所述存储电容的一端电性连接于第一节点，另一端电性连接于第二薄膜晶体管的漏极；所述有机发光二极管的阳极电性连接于第二节点，阴极接入电源负电压。
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