WO2016150101A1 - Oled像素驱动电路及驱动方法、oled显示装置 - Google Patents
Oled像素驱动电路及驱动方法、oled显示装置 Download PDFInfo
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- WO2016150101A1 WO2016150101A1 PCT/CN2015/088414 CN2015088414W WO2016150101A1 WO 2016150101 A1 WO2016150101 A1 WO 2016150101A1 CN 2015088414 W CN2015088414 W CN 2015088414W WO 2016150101 A1 WO2016150101 A1 WO 2016150101A1
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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
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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
- 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
- G09G2300/0814—Several active elements per pixel in active matrix panels used for selection purposes, e.g. logical AND for partial update
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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
- 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
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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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
- 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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
Definitions
- the present disclosure relates to an OLED pixel driving circuit, an OLED pixel driving method, and an OLED display device.
- the Active Matrix Organic Light Emitting Diode (AMOLED) display panel utilizes OLEDs to emit light of different brightnesses, so that the pixels corresponding to the OLED display have corresponding brightness.
- the AMOLED display panel Compared with the traditional Thin Film Transistor Liquid Crystal Display (TFT LCD), the AMOLED display panel has a faster response speed, higher contrast ratio and a wider viewing angle, which is an important aspect of the display panel. The direction of development.
- the current that drives the OLED illumination can be expressed by the following formula:
- Vgs is the voltage difference between the gate and the source of the driving transistor
- ⁇ is a parameter related to the process parameters and feature sizes of the driving transistor
- Vth is the threshold voltage of the driving transistor
- the driving current for driving the light emitting device OLED to emit light is related to the threshold voltage Vth of the driving transistor.
- the threshold voltage Vth of the driving transistor changes during the illuminating phase, which may affect the illuminating brightness of the OLED of the light emitting device, making it uneven during the illuminating process, and thus adversely affecting the display effect of the AMOLED display panel. .
- the present disclosure provides an OLED pixel driving circuit, an OLED pixel driving method, and an OLED display device, which can control the variation range of the illuminating brightness of the illuminating device within a preset range, thereby helping to make the OLED pixel in a frame.
- the brightness displayed inside is stable.
- the preset value may be 20 mV.
- the threshold voltage of the first transistor may be the same as the threshold voltage of the driving transistor.
- the reset module includes a second transistor, a third transistor; a control electrode of the second transistor is connected to the reset signal terminal, the first pole is connected to the input voltage terminal, and the second pole is connected to the second capacitor The terminal is connected; the control electrode of the third transistor is connected to the reset signal terminal, the first pole is connected to the input voltage terminal, and the second pole is connected to the first end of the first capacitor.
- the charging control module includes a fifth transistor; a control electrode of the fifth transistor is connected to the gate line, a first pole is connected to the data line, and a second pole is connected to the first pole of the first transistor.
- the illumination control module includes a fourth transistor; the control electrode of the fourth transistor is connected to the illumination signal end, the first pole is connected to the second pole of the driving transistor, and the second pole is connected to the light emitting device.
- the OLED pixel driving circuit further includes a second capacitor, the first end of the second capacitor is connected to the high voltage end, and the second end is connected to the second end of the first capacitor.
- the voltage at the high voltage terminal is greater than the voltage provided by the data line.
- the first transistor is the same size and shape as the drive transistor.
- the first transistor and the driving transistor are formed by the same patterning process.
- each of the transistors is a P-type tube.
- the present disclosure further provides an OLED pixel driving method for driving light emitting device in an OLED pixel by an OLED pixel driving circuit, the OLED pixel driving circuit including a reset module, a first capacitor, a first transistor, and a charging control Module, drive a transistor and an illumination control module; the OLED pixel driving method comprises the following steps:
- the data line is charged to the first capacitor via the first transistor, so that the voltage of the second end of the first capacitor is raised to Vdata+Vth1;
- the Vdata is the voltage on the data line, and
- Vth1 is the first a threshold voltage of a transistor;
- step S2 the voltage on the data line ranges from 0.8 to 1.5V.
- each of the transistors is a P-type tube; in step S1, the reset signal terminal inputs a low-level signal, the gate line inputs a high-level signal, and the illuminating signal terminal inputs a high-level signal; in step S2, the reset signal terminal Input high level signal, the gate line inputs low level signal, the illuminating signal end inputs high level signal; in step S3, the reset signal end inputs high level signal, the gate line inputs high level signal, and the illuminating signal end inputs low power Flat signal.
- the present disclosure also provides an OLED display device including the above-described OLED pixel driving circuit provided by the present disclosure.
- the OLED pixel driving circuit includes a first transistor, and charges the first capacitor through the first transistor, so that the voltage of the second terminal of the first capacitor rises to Vdata+Vth1, and can be driven when the driving current is generated.
- the current is related to a difference between the threshold voltage Vth1 of the first transistor and the threshold voltage Vth2 of the second transistor, and the difference between the threshold voltage Vth1 of the first transistor and the threshold voltage Vth2 of the driving transistor is less than a preset value, so that The variation of the light-emitting luminance of the light-emitting device is controlled within a preset range, thereby contributing to the stabilization of the brightness of the display of the OLED pixel in one frame.
- the OLED pixel driving method of the present disclosure charges a first capacitor by a first transistor to raise a voltage of a second terminal of the first capacitor to Vdata+Vth1, and can generate a driving current and a first transistor when generating a driving current
- the threshold voltage Vth1 is related to the difference between the threshold voltage Vth2 of the second transistor, and the threshold voltage of the first transistor is Vth1, and the difference between the threshold voltage and the threshold voltage Vth2 of the driving transistor is less than a preset value, thus
- the variation of the light-emitting luminance of the light-emitting device can be controlled within a preset range, thereby contributing to the stabilization of the brightness of the display of the OLED pixel in one frame.
- the OLED display device provided by the present disclosure can control the variation range of the illuminating brightness of the illuminating device within a preset range by using the OLED pixel driving circuit provided by the present disclosure, which helps to display the OLED pixel in one frame.
- the brightness is kept stable, which can improve the display.
- FIG. 1 is a schematic diagram of an OLED pixel driving circuit according to an embodiment of the present disclosure
- FIG. 2 is a timing diagram of signals in the OLED pixel driving circuit when each transistor in FIG. 1 is a P-type tube;
- FIG. 3 is a flowchart of an OLED pixel driving method according to an embodiment of the present disclosure.
- the present disclosure provides an embodiment of an OLED pixel driving circuit for driving light emitting devices in an OLED pixel to emit light.
- FIG. 1 is a schematic diagram of an OLED pixel driving circuit according to an embodiment of the present disclosure.
- the OLED pixel driving circuit includes a reset module 1 , a first capacitor C1 , a first transistor T1 , a charging control module 2 , a driving transistor M1 , and a lighting control module 3 .
- the reset module 1 is connected to both ends of the first capacitor C1 for charging both ends of the first capacitor C1 with an initial voltage at both ends thereof.
- the difference between the threshold voltage Vth1 of the first transistor T1 and the threshold voltage Vth2 of the driving transistor M1 is smaller than a preset value.
- the first pole of the first transistor T1 is connected to the charging control module 2, the second pole is connected to the first end of the first capacitor C1, and the control pole is connected to the second end of the first capacitor C1.
- the charging control module 2 is connected to the first transistor T1 and the data line Data for controlling the first transistor T1 to be in communication with or disconnected from the data line Data.
- the control electrode of the driving transistor M1 is connected to the second end of the first capacitor C1, the first pole is connected to the high voltage terminal VDD, and the second pole is connected to the light emission control module 3.
- the light emission control module 3 is connected to the light emitting device 4 for controlling the driving transistor M1 to communicate with or disconnect from the light emitting device 4.
- the "control electrode” is a gate
- the "first pole” is a source
- the “second pole” is a drain
- the "first pole” may be the drain and the “second pole” may be the source.
- the reset module 1 charges both ends of the first capacitor C1, resets the voltage of both ends of the first capacitor C1 to an initial voltage, and The initial voltage is within the turn-on voltage range of the first transistor T1.
- the first transistor T1 is turned on by the initial voltage, and at the same time, the charge control module 2 controls the data line Data to communicate with the first transistor T1. Thereby, the data line Data can charge the first capacitor C1 via the first transistor T1. Further, the process can be described as follows: the voltage of the first terminal of the first capacitor C1 is gradually increased to Vdata+Vth1, where Vdata is the voltage on the data line, and Vth1 is the threshold voltage of the first transistor T1. During the rising of the first end of the first capacitor C1, based on the bootstrap effect, the voltage of the second terminal of the first capacitor C1 also gradually rises, and finally rises to Vdata+Vth1.
- a drive current is generated based on the voltage on the gate of the drive transistor M1 and the voltage on the first pole.
- the driving current is I OLED , expressed by the following formula:
- the light emission control module 3 controls the communication of the driving transistor M1 and the light emitting device 4, so that the driving current is input to the light emitting device 4, thereby causing the light emitting device 4 to emit light.
- the driving current for driving the light-emitting device 4 to emit light is related to the difference between the threshold voltage Vth1 of the first transistor T1 and the threshold voltage Vth2 of the driving transistor M1, and since the difference between the two is less than a preset value, During the illumination process, the brightness variation of the illumination of the illumination device 4 can be controlled within a preset range, thereby helping to stabilize the display brightness of the OLED pixel in each frame of the picture.
- the preset value may be 20 mV, that is, the difference between the threshold voltage Vth1 of the first transistor T1 and the threshold voltage Vth2 of the driving transistor M1 is at most 20 mV.
- the threshold voltage of the first transistor T1 is The voltage Vth1 is the same as the threshold voltage Vth2 of the driving transistor M1, in this case, the current for driving the light-emitting device 4 to emit light
- the luminance of the light-emitting device 4 can be completely prevented from being affected by the threshold voltage Vth2 of the driving transistor M1, thereby ensuring that the luminance of the light-emitting device 4 remains stable.
- the reset module 1 may include a second transistor T2 and a third transistor T3.
- the control electrode of the second transistor T2 is connected to the reset signal terminal Reset, the first pole is connected to the input voltage terminal Vint, and the second pole is connected to the second terminal of the first capacitor C1.
- the control electrode of the third transistor T3 is connected to the reset signal terminal Reset, the first pole is connected to the input voltage terminal Vint, and the second pole is connected to the first end of the first capacitor C1.
- the charge control module 2 may include a fifth transistor T5.
- the gate electrode of the fifth transistor T5 is connected to the gate line Scan, the first electrode is connected to the data line Data, and the second electrode is connected to the first electrode of the first transistor T1.
- the illumination control module 3 can include a fourth transistor T4.
- the control electrode of the fourth transistor T4 is connected to the light-emitting signal terminal EM, the first electrode is connected to the second electrode of the driving transistor M1, and the second electrode is connected to the light-emitting device 4.
- the light emitting device 4 is also connected to the low voltage terminal VSS.
- Fig. 2 is a timing chart showing a period in which each signal drives the light-emitting device 4 to emit light when each transistor is a P-type tube.
- the reset signal terminal Reset inputs a low level signal to turn on the second transistor T2 and the third transistor T3.
- the fifth transistor T5 is turned off.
- the fourth transistor T4 is turned off.
- the input signal terminal Vint is charged to both ends of the first capacitor C1 via the second transistor T2 and the third transistor T3, respectively, and the voltage across the first capacitor C1 is reset. Is the initial voltage.
- the reset signal terminal Reset inputs a high level signal to turn off the second transistor T2 and the third transistor T3.
- the gate line Scan inputs a low level signal
- the fifth transistor T5 is turned on.
- the illuminating signal terminal EM still inputs a high level signal to turn off the fourth transistor T4.
- the fifth transistor T5 is turned on, the data line Data is charged to the first capacitor C1 via the fifth transistor T5 and the first transistor T1, so that the voltage of the first terminal of the first capacitor C1 is gradually increased to Vdata+Vth1. It can be understood that, based on the bootstrap effect, the voltage at the second end of the first capacitor C1, that is, the voltage at point A in FIG. 1, will also gradually rise to Vdata+Vth1, as shown in FIG.
- the reset signal terminal Reset inputs a high level signal to turn off the second transistor T2 and the third transistor T3.
- the gate line Scan inputs a high level signal to turn off the fifth transistor T5.
- the illuminating signal terminal EM inputs a low level signal to turn on the fourth transistor T4.
- the driving current generated according to the voltage of the gate electrode of the driving transistor M1 and the voltage of the first electrode can be input to the light emitting device 4 via the fourth transistor T4, and the light emitting device 4 is driven to emit light.
- the driving current I OLED can be expressed as:
- the driving current is related to the difference between the threshold voltage Vth1 of the first transistor T1 and the threshold voltage Vth2 of the driving transistor M1, and the difference between the two can be set to be smaller than a preset value, and therefore, the light is emitted.
- the value of the driving current I OLED can be controlled within a preset range. That is to say, the variation range of the luminance of the light-emitting device 4 in one period is within a preset range, thereby contributing to the stabilization of the display luminance of the OLED pixel in one frame.
- the first end of the first capacitor C1 is in a floating state. In this state, the charge stored in the first capacitor C1 is easily lost, thereby causing the voltage at point A. Variety.
- the OLED pixel driving circuit may further include a second capacitor C2.
- the first end of the second capacitor C2 is connected to the high voltage terminal VDD, and the second end is connected to the second end of the first capacitor C1.
- the second capacitor C2 is connected to the second end of the first capacitor C1, so that the voltage at the point A can be prevented from being changed due to the floating of the first end of the first capacitor C1, thereby preventing the driving current for driving the light-emitting device 4 to be unstable.
- the voltage of the high voltage terminal VDD may be greater than the voltage Vdata provided by the data line Data.
- the driving current I OLED can drive the light emitting device 4 to emit light.
- VDD is less than Vdata
- the driving current I OLED cannot drive the light emitting device 4 to emit light.
- the voltage Vdata supplied from the data line Data ranges from 0.8 to 1.5V.
- the size and shape of the first transistor T1 and the driving transistor M1 may be the same to ensure that the threshold voltage Vth1 of the first transistor T1 and the threshold voltage Vth2 of the driving transistor M1 are equal. Further, the first transistor T1 and the driving transistor M1 are formed by the same patterning process, and the arrangement can also reduce the number of patterning processes, reduce cost, and improve production efficiency.
- each transistor is not limited to a P-type tube, and in practice, each transistor may be an N-type tube. It can be understood that when each transistor is an N-type tube, the timing of each signal is opposite to the timing of each signal shown in FIG. 2.
- the OLED pixel driving circuit includes a first transistor T1 and charges the first capacitor C1 via the first transistor T1 such that the voltage of the gate of the driving transistor M1 connected to the first capacitor C1 includes a threshold voltage.
- Vth1 is related to a difference between a threshold voltage Vth1 of the first transistor T1 and a threshold voltage Vth2 of the driving transistor M1 according to a driving current generated according to a voltage of the control electrode of the driving transistor M1 and the first electrode, and the first transistor T1
- the difference between the threshold voltage Vth1 and the threshold voltage Vth2 of the driving transistor M1 is less than a preset value, so that the variation of the luminance of the light-emitting device 4 in one period can be controlled within a preset range, which contributes to the OLED pixel in one The brightness of the light during the frame time remains stable.
- the present disclosure also provides an embodiment of an OLED pixel driving method that drives an OLED device in an OLED pixel to emit light based on the OLED pixel driving circuit provided by the above-described embodiments of the present disclosure.
- FIG. 3 is a flowchart of an OLED pixel driving method according to an embodiment of the present disclosure. As shown in FIG. 3, the OLED pixel driving method includes the following processes:
- the initial voltage is within the turn-on voltage range of the first transistor T1.
- the first transistor whose gate is connected to the second end of the first capacitor is turned on.
- step S1 in the case where each transistor is a P-type tube, a reset signal terminal inputs a low level signal, a gate line inputs a high level signal, and an illuminating signal terminal inputs a high level signal.
- step S2 the data line is charged to the first capacitor via the first transistor, so that the voltage of the second terminal of the first capacitor is raised to Vdata+Vth1, where Vdata is the voltage on the data line, Vth1 Is the threshold voltage of the first transistor.
- the voltage of the gate of the first transistor connected to the second terminal of the first capacitor is also Vdata+Vth1.
- step S2 in the case where each transistor is a P-type tube, a high-level signal is input to the reset signal terminal, a low-level signal is input to the gate line, and a high-level signal is input to the light-emitting signal terminal.
- step S3 a driving current is generated according to the control electrode of the driving transistor and the voltage of the first electrode, and the driving transistor is connected to the light emitting device to input the driving current to the light emitting device to cause the light emitting device to emit light.
- step S3 in the case where each transistor is a P-type tube, a high-level signal is input to the reset signal terminal, a high-level signal is input to the gate line, and a low-level signal is input to the light-emitting signal terminal.
- the generated driving current I OLED is related to the difference between the threshold voltage of the first transistor and the threshold voltage of the driving transistor (the specificity of the driving current I OLED )
- the value has been described in the above embodiment of the OLED pixel driving circuit, which will not be described herein, and the difference between the illuminating brightness of the illuminating device can be controlled in advance by making the difference between the two smaller than the preset value. Within the range, the brightness of the OLED pixels displayed in one frame of the picture is kept stable.
- the voltage on the data line may range from 0.8 to 1.5V.
- the OLED pixel driving method charges the first capacitor by the first transistor, so that the voltage of the second end of the first capacitor rises to Vdata+Vth1, and when the driving current is generated, the driving current and the first transistor
- the threshold voltage is related to the difference between the threshold voltage Vth of the driving transistor, and the difference between the threshold voltage of the first transistor and the threshold voltage of the driving transistor is less than a preset value, so that the variation range of the luminance of the light emitting device can be changed.
- the control is within the preset range, thereby helping to stabilize the brightness of the OLED pixels displayed in one frame.
- the present disclosure also provides an embodiment of an OLED display device.
- the OLED display device includes the OLED pixel driving circuit provided by the above embodiments of the present disclosure.
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Abstract
一种OLED像素驱动电路及驱动方法、OLED显示装置。OLED像素驱动电路包括复位模块(1)、第一电容(C1)、第一晶体管(T1)、充电控制模块(2)、驱动晶体管(M1)和发光控制模块(3);复位模块(1)与第一电容(C1)的两端连接,用于使其两端具有初始电压;第一晶体管(T1)的第一极与充电控制模块(2)连接,第二极与第一电容(C1)的第一端连接,控制极与第一电容(C1)的第二端连接;充电控制模块(2)与第一晶体管(T1)和数据线(Data)连接;驱动晶体管(M1)的控制极与第一电容(C1)的第二端连接,第一极与高电压端(VDD)连接,第二极与发光控制模块(3)连接;发光控制模块(3)与发光器件(4)连接,其中第一晶体管(T1)的阈值电压与驱动晶体管(M1)的阈值电压的差值小于预设值。OLED像素驱动电路可以使OLED像素在一帧画面内的亮度维持稳定。
Description
本公开涉及一种OLED像素驱动电路,OLED像素驱动方法,以及OLED显示装置。
有源矩阵有机发光二极管(Active Matrix Organic Light Emitting Diode,以下简称为AMOLED)显示面板利用OLED发出不同亮度的光线,使与OLED对应的像素显示具有相应的亮度。相对于传统的薄膜晶体管液晶显示面板(Thin Film Transistor Liquid Crystal Display,以下简称为TFT LCD),AMOLED显示面板具有更快的反应速度,更高的对比度以及更广大的视角,是显示面板的一个重要的发展方向。
驱动OLED发光的电流可以用以下公式表示:
其中,Vgs为驱动晶体管的栅极与源极之间的电压差,β是与驱动晶体管的工艺参数和特征尺寸有关的参数,Vth为驱动晶体管的阈值电压。
根据上述公式,驱动发光器件OLED发光的驱动电流与驱动晶体管的阈值电压Vth有关。而在实际应用中,驱动晶体管的阈值电压Vth会在发光阶段发生变化,从而会影响发光器件OLED的发光亮度,使其在发光过程中不均匀,进而会对AMOLED显示面板的显示效果产生不良影响。
发明内容
本公开提出了一种OLED像素驱动电路、OLED像素驱动方法及OLED显示装置,其可以将发光器件的发光亮度的变化幅度控制在预设范围之内,从而有助于使OLED像素在一帧画面内显示的亮度保持稳定。
按照本公开的一个方面,提供一种OLED像素驱动电路,其用于驱动OLED像素中的发光器件发光,所述OLED像素驱动电路包括复位模块、第一电容、第一晶体管、充电控制模块、驱动晶体管和发光控制模块;
所述复位模块与第一电容的两端连接,用于对第一电容的两端充电,使其两端具有初始电压;所述第一晶体管的第一极与充电控制模块连接,第二极与第一电容的第一端连接,控制极与第一电容的第二端连接;所述充电控制模块与第一晶体管和数据线连接,用于控制第一晶体管与数据线连通或断开;所述驱动晶体管的控制极与所述第一电容的第二端连接,第一极与高电压端连接,第二极与发光控制模块连接;所述发光控制模块与发光器件连接,用于控制驱动晶体管与发光器件连通或断开,其中所述第一晶体管的阈值电压与驱动晶体管的阈值电压的差值小于预设值。
示例性地,所述预设值可以为20mV。
可替换地,所述第一晶体管的阈值电压与驱动晶体管的阈值电压可以相同。
示例性地,所述复位模块包括第二晶体管、第三晶体管;所述第二晶体管的控制极与复位信号端连接,第一极与输入电压端连接,第二极与第一电容的第二端连接;所述第三晶体管的控制极与复位信号端连接,第一极与输入电压端连接,第二极与第一电容的第一端连接。
示例性地,所述充电控制模块包括第五晶体管;所述第五晶体管的控制极与栅线连接,第一极与数据线连接,第二极与第一晶体管的第一极连接。
示例性地,所述发光控制模块包括第四晶体管;所述第四晶体管的控制极与发光信号端连接,第一极与驱动晶体管的第二极连接,第二极与发光器件连接。
示例性地,所述OLED像素驱动电路还包括第二电容,所述第二电容的第一端与高电压端连接,第二端与第一电容的第二端连接。
示例性地,所述高电压端的电压大于所述数据线提供的电压。
示例性地,所述第一晶体管与驱动晶体管的尺寸和形状相同。
可替换地,所述第一晶体管与驱动晶体管通过相同的构图工艺形成。
示例性地,各所述晶体管为P型管。
作为另一个技术方案,本公开还提供一种OLED像素驱动方法,通过OLED像素驱动电路驱动OLED像素中的发光器件发光,该OLED像素驱动电路包括复位模块、第一电容、第一晶体管、充电控制模块、驱
动晶体管和发光控制模块;所述OLED像素驱动方法包括下列步骤:
S1,由复位模块对第一电容的两端进行充电,将其两端的电压重置为初始电压;
S2,在充电控制模块的控制下,数据线经第一晶体管向第一电容充电,使第一电容的第二端的电压升至Vdata+Vth1;所述Vdata为数据线上的电压,Vth1为第一晶体管的阈值电压;
S3,在所述发光控制模块的控制下,根据驱动晶体管的控制极、第一极的电压,生成驱动电流,并使驱动晶体管与发光器件连接,以使所述驱动电流输入到发光器件,使所述发光器件发光。
示例性地,步骤S2中,所述数据线上电压的范围为0.8~1.5V。
示例性地,各所述晶体管为P型管;步骤S1中,复位信号端输入低电平信号,栅线输入高电平信号,发光信号端输入高电平信号;步骤S2中,复位信号端输入高电平信号,栅线输入低电平信号,发光信号端输入高电平信号;步骤S3中,复位信号端输入高电平信号,栅线输入高电平信号,发光信号端输入低电平信号。
按照本公开的另一个方面,本公开还提供一种OLED显示装置,其包括本公开提供的上述OLED像素驱动电路。
本公开提供的OLED像素驱动电路,其包括第一晶体管,并经第一晶体管对第一电容充电,使第一电容的第二端的电压升至Vdata+Vth1,在生成驱动电流时,可以使驱动电流与第一晶体管的阈值电压Vth1和第二晶体管的阈值电压Vth2之间的差值有关,而第一晶体管的阈值电压Vth1与驱动晶体管的阈值电压Vth2的差值小于预设值,这样就可以将发光器件的发光亮度的变化控制在预设范围之内,从而有助于使OLED像素在一帧画面内显示的亮度保持稳定。
本公开提供的OLED像素驱动方法,其经第一晶体管对第一电容进行充电,使第一电容的第二端的电压升至Vdata+Vth1,在生成驱动电流时,可以使驱动电流与第一晶体管的阈值电压Vth1和第二晶体管的阈值电压Vth2之间的差值有关,而第一晶体管的阈值电压为Vth1,且其与驱动晶体管的阈值电压Vth2之间的差值小于预设值,这样就可以将发光器件的发光亮度的变化控制在预设范围之内,从而有助于使OLED像素在一帧画面内显示的亮度保持稳定。
本公开提供的OLED显示装置,其采用本公开提供的上述OLED像素驱动电路,可以将发光器件的发光亮度的变化幅度控制在预设范围之内,有助于使OLED像素在一帧画面内显示的亮度保持稳定,从而可以提升显示效果。
图1为本公开实施方式提供的OLED像素驱动电路的示意图;
图2为图1中各晶体管为P型管时,OLED像素驱动电路中各信号的时序图;
图3为本公开实施方式提供的OLED像素驱动方法的流程图。
以下结合附图对本公开的具体实施方式进行详细说明。应当理解的是,此处所描述的具体实施方式仅用于说明和解释本发明的原理,并不用于限制本发明的范围。
本公开提供一种OLED像素驱动电路的实施方式,所述OLED像素驱动电路用于驱动OLED像素中的发光器件发光。
图1为本公开实施方式提供的OLED像素驱动电路的示意图。如图1所示,在本实施方式中,所述OLED像素驱动电路包括复位模块1、第一电容C1、第一晶体管T1、充电控制模块2、驱动晶体管M1和发光控制模块3。复位模块1与第一电容C1的两端连接,用于对第一电容C1的两端充电,使其两端具有初始电压。第一晶体管T1的阈值电压Vth1与驱动晶体管M1的阈值电压Vth2的差值小于预设值。第一晶体管T1的第一极与充电控制模块2连接,第二极与第一电容C1的第一端连接,控制极与第一电容C1的第二端连接。充电控制模块2与第一晶体管T1和数据线Data连接,用于控制第一晶体管T1与数据线Data连通或断开。驱动晶体管M1的控制极与第一电容C1的第二端连接,第一极与高电压端VDD连接,第二极与发光控制模块3连接。发光控制模块3与发光器件4连接,用于控制驱动晶体管M1与发光器件4连通或断开。
在本实施方式中,上述第一晶体管T1、驱动晶体管M1以及下文所述各晶体管中,“控制极”为栅极,“第一极”为源极,“第二极”为漏极;
当然,也可以是“第一极”为漏极,“第二极”为源极。
本实施方式提供的OLED像素驱动电路驱动发光器件4发光时,在第一阶段,复位模块1对第一电容C1的两端充电,将第一电容C1的两端的电压重置为初始电压,并且,所述初始电压处于第一晶体管T1的开启电压范围之内。
在第二阶段,第一晶体管T1被初始电压开启,同时,充电控制模块2控制数据线Data与第一晶体管T1连通。从而,数据线Data可以经第一晶体管T1对第一电容C1充电。进一步地,该过程可以描述如下:第一电容C1的第一端的电压逐步上升至Vdata+Vth1,其中,Vdata为数据线上的电压,Vth1为第一晶体管T1的阈值电压。在第一电容C1的第一端上升的过程中,基于自举效应,第一电容C1的第二端的电压也逐步上升,最终也升至Vdata+Vth1。
在第三阶段,根据驱动晶体管M1的控制极上的电压和第一极上的电压,生成驱动电流。具体地,该驱动电流为IOLED,以下述公式表述:
与此同时,发光控制模块3控制驱动晶体管M1和发光器件4的连通,这样,驱动电流输入到发光器件4中,从而使发光器件4发光。
根据以上所述可知,驱动发光器件4发光的驱动电流与第一晶体管T1的阈值电压Vth1和驱动晶体管M1的阈值电压Vth2的差值有关,而由于其二者的差值小于预设值,因此,在发光过程中,发光器件4发光的亮度变化可以控制在预设范围之内,从而有助于使OLED像素在每一帧画面内的显示亮度保持稳定。
在本实施方式中,可替换地,所述预设值可以为20mV,即:所述第一晶体管T1的阈值电压Vth1和驱动晶体管M1的阈值电压Vth2之间的差值最大为20mV。这样在发光过程中,可以使发光器件4的发光亮度保持在较稳定的范围之内。进一步可替换地,所述第一晶体管T1的阈值电
压Vth1与驱动晶体管M1的阈值电压Vth2相同,这样的话,驱动发光器件4发光的电流
从而可以使发光器件4的亮度完全不受驱动晶体管M1的阈值电压Vth2的影响,从而保证发光器件4的发光亮度保持稳定。
示例性地,复位模块1可以包括第二晶体管T2、第三晶体管T3。第二晶体管T2的控制极与复位信号端Reset连接,第一极与输入电压端Vint连接,第二极与第一电容C1的第二端连接。第三晶体管T3的控制极与复位信号端Reset连接,第一极与输入电压端Vint连接,第二极与第一电容C1的第一端连接。
此外,充电控制模块2可以包括第五晶体管T5。第五晶体管T5的控制极与栅线Scan连接,第一极与数据线Data连接,第二极与第一晶体管T1的第一极连接。
发光控制模块3可以包括第四晶体管T4。第四晶体管T4的控制极与发光信号端EM连接,第一极与驱动晶体管M1的第二极连接,第二极与发光器件4连接。发光器件4还与低电压端VSS连接。
下面以各晶体管为P型管为例,结合在此情况下各信号的时序对本实施方式提供的OLED像素驱动电路驱动发光器件4发光的原理和过程进行详细描述。
图2示出了各晶体管为P型管时,各信号在驱动发光器件4发光的一个周期内的时序图。如图2所示,在该周期内的第一阶段t1内,复位信号端Reset输入低电平信号,使第二晶体管T2、第三晶体管T3开启。当栅线Scan输入高电平信号,使第五晶体管T5截止。当发光信号端EM输入高电平信号,使第四晶体管T4截止。在第二晶体管T2、第三晶体管T3开启的情况下,输入信号端Vint分别经第二晶体管T2、第三晶体管T3向第一电容C1的两端充电,将第一电容C1两端的电压重置为初始电压。
在第二阶段t2内,复位信号端Reset输入高电平信号,使第二晶体管T2、第三晶体管T3截止。当栅线Scan输入低电平信号,使第五晶体管T5开启。发光信号端EM仍输入高电平信号,使第四晶体管T4截止。
在第五晶体管T5开启的情况下,数据线Data经第五晶体管T5、第一晶体管T1向第一电容C1充电,使第一电容C1的第一端的电压逐步升至Vdata+Vth1。可以理解,基于自举效应,第一电容C1的第二端的电压,即图1中A点的电压,也会逐步升至Vdata+Vth1,如图2所示。
在第三阶段t3内,复位信号端Reset输入高电平信号,使第二晶体管T2、第三晶体管T3截止。栅线Scan输入高电平信号,使第五晶体管T5截止。发光信号端EM输入低电平信号,使第四晶体管T4开启。在第四晶体管T4开启的情况下,根据驱动晶体管M1的控制极的电压和第一极的电压而生成的驱动电流可以经第四晶体管T4输入到发光器件4中,驱动发光器件4发光。并且,所述驱动电流IOLED可以表示为:
根据该公式可知,驱动电流与第一晶体管T1的阈值电压Vth1和驱动晶体管M1的阈值电压Vth2之间的差值有关,而其二者的差值可以设置为小于预设值,因此,在发光过程中,可以将驱动电流IOLED的值控制在预设范围之内。也就是说,使发光器件4在一个周期内的发光亮度的变化幅度在预设范围之内,从而有助于使OLED像素在一帧画面中的显示亮度保持稳定。
根据上述可知,在第三阶段t3内,第一电容C1的第一端处于悬空状态(floating),在这种状态下,第一电容C1中所储存的电荷容易流失,从而导致A点的电压变化。
可替换地,如图1所示,OLED像素驱动电路还可以包括第二电容C2。第二电容C2的第一端与高电压端VDD连接,第二端与第一电容C1的第二端连接。第二电容C2与第一电容C1的第二端连接,可以避免A点的电压因第一电容C1第一端的悬空而发生变化,从而避免驱动发光器件4发光的驱动电流不稳定。
在本实施方式中,可替换地,高电压端VDD的电压可以大于数据线Data提供的电压Vdata。在此情况下,驱动电流IOLED可以驱动发光器件
4发光。而当VDD小于Vdata时,驱动电流IOLED无法驱动发光器件4发光。一般地,数据线Data提供的电压Vdata的范围为0.8~1.5V。
可替换地,第一晶体管T1与驱动晶体管M1的尺寸和形状可以相同,以保证第一晶体管T1的阈值电压Vth1和驱动晶体管M1的阈值电压Vth2相等。进一步地,第一晶体管T1和驱动晶体管M1通过相同的构图工艺形成,这样设置还可以减少构图工艺的次数,降低成本,提高生产效率。
需要说明的是,在本实施方式中,各晶体管并不限于采用P型管,实际中,各晶体管还可以为N型管。可以理解,在各晶体管为N型管时,各信号的时序与图2所示各信号的时序相反。
本公开实施方式提供的OLED像素驱动电路,其包括第一晶体管T1,并经第一晶体管T1对第一电容C1充电,使与第一电容C1连接的驱动晶体管M1的栅极的电压包含阈值电压Vth1,进而使根据驱动晶体管M1的控制极和第一极的电压而生成的驱动电流中与第一晶体管T1的阈值电压Vth1和驱动晶体管M1的阈值电压Vth2的差值有关,而第一晶体管T1的阈值电压Vth1与驱动晶体管M1的阈值电压Vth2的差值小于预设值,这样就可以将发光器件4在一个周期内的发光亮度的变化控制在预设范围内,有助于OLED像素在一帧时间内的发光亮度保持稳定。
本公开还提供一种OLED像素驱动方法的实施方式,所述OLED像素驱动方法基于本公开上述实施方式提供的OLED像素驱动电路驱动OLED像素中的发光器件发光。
图3为本公开实施方式提供的OLED像素驱动方法的流程图。如图3所示,所述OLED像素驱动方法包括下列过程:
在步骤S1中,对第一电容的两端进行充电,将其两端的电压重置为初始电压。
其中,所述初始电压处于第一晶体管T1的开启电压范围之内。当所述第一电容的第二端具有初始电压时,控制极与第一电容的第二端连接的第一晶体管开启。
示例性地,步骤S1中,在各晶体管为P型管的情况下,复位信号端输入低电平信号,栅线输入高电平信号,发光信号端输入高电平信号。
在步骤S2中,数据线经第一晶体管向第一电容充电,使第一电容的第二端的电压升至Vdata+Vth1,其中,Vdata为数据线上的电压,Vth1
为第一晶体管的阈值电压。
示例性地,当第一电容的第二端的电压升至Vdata+Vth1时,与第一电容的第二端连接的第一晶体管的控制极的电压也为Vdata+Vth1。
步骤S2中,在各晶体管为P型管的情况下,复位信号端输入高电平信号,栅线输入低电平信号,发光信号端输入高电平信号。
在步骤S3中,根据驱动晶体管的控制极、第一极的电压,生成驱动电流,并使驱动晶体管与发光器件连接,以使所述驱动电流输入到发光器件,使所述发光器件发光。
示例性地,步骤S3中,在各晶体管为P型管的情况下,复位信号端输入高电平信号,栅线输入高电平信号,发光信号端输入低电平信号。
在第一晶体管的控制极的电压为Vdata+Vth1的情况下,所生成的驱动电流IOLED与第一晶体管的阈值电压和驱动晶体管的阈值电压之间的差值有关(驱动电流IOLED的具体数值在上述OLED像素驱动电路的实施方式中已有说明,在此不再赘述),而通过使二者的差值小于预设值,这样就可以将发光器件的发光亮度的变化幅度控制在预设范围之内,从而有助于OLED像素在一帧画面内显示的亮度保持稳定。
可替换地,步骤S2中,所述数据线上电压的范围可以为0.8~1.5V。
本公开实施方式提供的OLED像素驱动方法,其经第一晶体管对第一电容进行充电,使第一电容的第二端的电压升至Vdata+Vth1,在生成驱动电流时,驱动电流与第一晶体管的阈值电压和驱动晶体管的阈值电压Vth的差值有关,而且,使第一晶体管的阈值电压和驱动晶体管的阈值电压的差值小于预设值,这样就可以将发光器件的发光亮度的变化幅度控制在预设范围之内,从而有助于使OLED像素在一帧画面内显示的亮度保持稳定。
本公开还提供一种OLED显示装置的实施方式,在本实施方式中,OLED显示装置包括本公开上述实施方式提供的OLED像素驱动电路。
本公开实施方式提供的OLED显示装置,其采用本公开上述实施方式提供的OLED像素驱动电路,可以将发光器件的发光亮度控制在预设范围之内,有助于使OLED像素在一帧画面内显示的亮度保持稳定,从而可以提升显示效果。
可以理解的是,以上实施方式仅仅是为了说明本发明的原理而采用的示例
性实施方式,然而本发明并不局限于此。对于本领域内的普通技术人员而言,在不脱离本发明的精神和实质的情况下,可以做出各种变型和改进,这些变型和改进均视为落入本发明的保护范围之内。本发明的保护范围由所附权利要求来限定。
本申请要求于2015年3月26日递交的中国专利申请第201510138231.3号的优先权,在此全文引用该中国专利申请公开的内容作为本申请的一部分。
Claims (15)
- 一种OLED像素驱动电路,用于驱动OLED像素中的发光器件发光,其中,所述OLED像素驱动电路包括复位模块、第一电容、第一晶体管、充电控制模块、驱动晶体管和发光控制模块;所述复位模块与第一电容的两端连接,用于对第一电容的两端充电,使其两端具有初始电压;所述第一晶体管的第一极与充电控制模块连接,第二极与第一电容的第一端连接,控制极与第一电容的第二端连接;所述充电控制模块与第一晶体管和数据线连接,用于控制第一晶体管与数据线连通或断开;所述驱动晶体管的控制极与所述第一电容的第二端连接,第一极与高电压端连接,第二极与发光控制模块连接;所述发光控制模块与发光器件连接,用于控制驱动晶体管与发光器件连通或断开,其中所述第一晶体管的阈值电压与驱动晶体管的阈值电压的差值小于预设值。
- 根据权利要求1所述的OLED像素驱动电路,其中,所述复位模块包括第二晶体管、第三晶体管;所述第二晶体管的控制极与复位信号端连接,第一极与输入电压端连接,第二极与第一电容的第二端连接;所述第三晶体管的控制极与复位信号端连接,第一极与输入电压端连接,第二极与第一电容的第一端连接。
- 根据权利要求2所述的OLED像素驱动电路,其中,所述充电控制模块包括第五晶体管;所述第五晶体管的控制极与栅线连接,第一极与数据线连接,第二极与第一晶体管的第一极连接。
- 根据权利要求3所述的OLED像素驱动电路,其中,所述发光控制模块包括第四晶体管;所述第四晶体管的控制极与发光信号端连接,第一极与驱动晶体管的第二极连接,第二极与发光器件连接。
- 根据权利要求1-4任意一项所述的OLED像素驱动电路,其中,所述OLED像素驱动电路还包括第二电容,所述第二电容的第一端与高电压端连接,第二端与第一电容的第二端连接。
- 根据权利要求1-4任意一项所述的OLED像素驱动电路,其中,所述高电压端的电压大于所述数据线提供的电压。
- 根据权利要求3所述的OLED像素驱动电路,其中,所述第一晶体管与驱动晶体管的尺寸和形状相同。
- 根据权利要求1-7中任意一项像素驱动电路,其中,所述第一晶体管与驱动晶体管通过相同的构图工艺形成。
- 根据权利要求4所述的OLED像素驱动电路,其中,各所述晶体管为P型管。
- 根据权利要求1所述的OLED像素驱动电路,其中,所述预设值为20mV。
- 根据权利要求1-10之一所述的OLED像素驱动电路,其中,所述第一晶体管的阈值电压与驱动晶体管的阈值电压相同。
- 一种OLED像素驱动方法,通过OLED像素驱动电路驱动OLED像素中的发光器件发光,该OLED像素驱动电路包括复位模块、第一电容、第一晶体管、充电控制模块、驱动晶体管和发光控制模块;所述OLED像素驱动方法包括下列步骤:S1,由复位模块对第一电容的两端进行充电,将其两端的电压重置为初始电压;S2,在充电控制模块的控制下,数据线经第一晶体管向第一电容充电,使第一电容的第二端的电压升至Vdata+Vth1;所述Vdata为数据线上的电压,Vth1为第一晶体管的阈值电压;S3,在所述发光控制模块的控制下,根据驱动晶体管的控制极、第一极的电压,生成驱动电流,并使驱动晶体管与发光器件连接,以使所述驱动电流输入到发光器件,使所述发光器件发光。
- 根据权利要求12所述的OLED像素驱动方法,其中,步骤S2中,所述数据线上电压的范围为0.8~1.5V。
- 根据权利要求12所述的OLED像素驱动方法,其中,所述OLED像素驱动电路中的各所述晶体管为P型管;步骤S1中,复位信号端输入低电平信号,栅线输入高电平信号,发光信号端输入高电平信号;步骤S2中,复位信号端输入高电平信号,栅线输入低电平信号,发光信号端输入高电平信号;步骤S3中,复位信号端输入高电平信号,栅线输入高电平信号,发光信号端输入低电平信号。
- 一种OLED显示装置,包括权利要求1-11任意一项所述的OLED像素驱动电路。
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