WO2023010593A1 - 像素驱动电路以及移动终端 - Google Patents

像素驱动电路以及移动终端 Download PDF

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Publication number
WO2023010593A1
WO2023010593A1 PCT/CN2021/111781 CN2021111781W WO2023010593A1 WO 2023010593 A1 WO2023010593 A1 WO 2023010593A1 CN 2021111781 W CN2021111781 W CN 2021111781W WO 2023010593 A1 WO2023010593 A1 WO 2023010593A1
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WO
WIPO (PCT)
Prior art keywords
thin film
transistor
driving circuit
voltage
voltage dividing
Prior art date
Application number
PCT/CN2021/111781
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English (en)
French (fr)
Inventor
胡道兵
Original Assignee
Tcl华星光电技术有限公司
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Publication of WO2023010593A1 publication Critical patent/WO2023010593A1/zh

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Classifications

    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]

Definitions

  • the present invention relates to the technical field of display panels, in particular to a pixel driving circuit and a mobile terminal.
  • Mini-LED backlight Compared with traditional backlight, Mini-LED backlight has excellent contrast.
  • the current driving architecture of Mini-LED display panels is mainly based on 2T1C, while Light-Emitting Diode (LED) is a current-driven device, and the backplane signal of the display panel under the active matrix driving technology is voltage-controlled, so , under this technology, the stability requirements for thin film transistor (Thin Film Transistor, TFT) devices are very high, especially the stability and uniformity of the driving thin film transistor used to drive light emitting diodes will directly affect the light emission of light emitting diodes brightness.
  • TFT Thin Film Transistor
  • MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
  • MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
  • the field effect transistor mainly works in the saturation region, and a small change in the data voltage received by the gate will cause a large change in the current of the drain, so that the pixel driving circuit under this design cannot achieve high grayscale. display controls.
  • the invention provides a pixel driving circuit and a mobile terminal, which effectively solves the problem that the pixel driving circuit cannot realize display control under high grayscale.
  • the present invention provides a pixel driving circuit, which is applied to a display panel, the display panel includes scanning lines and data lines, and the pixel driving circuit includes:
  • switch thin film transistors used to receive the data signals on the data lines according to the scan signals on the scan lines
  • a storage module electrically connected to the switching thin film transistor, for being charged by the data signal
  • the driving light-emitting module includes a driving unit, a light-emitting unit, and a voltage-dividing transistor connected in series, and has a power supply voltage access port and a grounding port for being driven by the data signal to emit light, wherein the voltage-dividing transistor is connected in series to the Between the drive unit and the ground port.
  • the number of gray levels of the display panel is proportional to the resistance of the voltage dividing transistor.
  • the voltage dividing transistor is a voltage dividing thin film transistor, the gate and the drain of the voltage dividing thin film transistor are electrically connected, and the ratio of the channel width and the channel length of the voltage dividing thin film transistor is equal to the The number of gray levels is directly proportional.
  • the pixel driving circuit further includes a control module, the control module is configured to adjust the power supply voltage connected to the pixel driving circuit so that the voltage-dividing thin film transistor works in a linear region or a saturation region.
  • the switching thin film transistor and the voltage dividing thin film transistor are amorphous silicon thin film transistors or indium gallium zinc oxide thin film transistors.
  • multiple voltage-dividing transistors there are multiple voltage-dividing transistors, and multiple voltage-dividing transistors are connected in series and/or in parallel.
  • the storage unit includes a capacitor, one end of the capacitor is electrically connected to the switching thin film transistor and the driving light-emitting module, and the other end of the capacitor is electrically connected to the ground port.
  • the drive unit includes a metal oxide semiconductor field effect transistor, the gate of the metal oxide semiconductor field effect transistor is electrically connected to the switching thin film transistor and the storage module, and the metal oxide semiconductor field effect transistor The drain of the effect transistor is electrically connected to the power supply voltage input port, and the source of the MOSFET is electrically connected to the ground port.
  • the light emitting unit is connected in series between the power supply voltage access port and the drive unit, or between the drive unit and the ground port.
  • the voltage dividing transistor has a first resistance value
  • the light-emitting unit includes a light-emitting diode
  • the light-emitting diode has a second resistance value, a minimum driving current value, and a maximum driving current value
  • the pixel driving circuit is connected to The ratio of the voltage value of the power supply voltage to the sum of the first resistance value and the second resistance value is between the minimum driving current value and the maximum driving current value.
  • the voltage dividing transistor is a voltage dividing crystal diode.
  • the present invention also provides a mobile terminal, which includes:
  • the source driver is connected to the data line.
  • the number of gray levels of the display panel is proportional to the resistance of the voltage dividing transistor.
  • the voltage dividing transistor is a voltage dividing thin film transistor, the gate and the drain of the voltage dividing thin film transistor are electrically connected, and the ratio of the channel width and the channel length of the voltage dividing thin film transistor is equal to the The number of gray levels is directly proportional.
  • the pixel driving circuit further includes a control module, the control module is configured to adjust the power supply voltage connected to the pixel driving circuit so that the voltage-dividing thin film transistor works in a linear region or a saturation region.
  • the switching thin film transistor and the voltage dividing thin film transistor are amorphous silicon thin film transistors or indium gallium zinc oxide thin film transistors.
  • the storage unit includes a capacitor, one end of the capacitor is electrically connected to the switching thin film transistor and the driving light-emitting module, and the other end of the capacitor is electrically connected to the ground port.
  • the drive unit includes a metal oxide semiconductor field effect transistor, the gate of the metal oxide semiconductor field effect transistor is electrically connected to the switching thin film transistor and the storage module, and the metal oxide semiconductor field effect transistor The drain of the effect transistor is electrically connected to the power supply voltage input port, and the source of the MOSFET is electrically connected to the ground port.
  • the light emitting unit is connected in series between the power supply voltage access port and the drive unit, or between the drive unit and the ground port.
  • the voltage dividing transistor has a first resistance value
  • the light-emitting unit includes a light-emitting diode
  • the light-emitting diode has a second resistance value, a minimum driving current value, and a maximum driving current value
  • the pixel driving circuit is connected to The ratio of the voltage value of the power supply voltage to the sum of the first resistance value and the second resistance value is between the minimum driving current value and the maximum driving current value.
  • the present invention provides a pixel driving circuit and a mobile terminal.
  • the pixel driving circuit is applied to a display panel.
  • the display panel includes scanning lines and data lines.
  • the switching thin film transistor for the data signal, the storage module electrically connected with the switching thin film transistor and used for being charged by the data signal, and the driving light emitting module, the driving light emitting module includes a driving unit, a light emitting unit and a voltage dividing transistor connected in series, and has a power supply voltage connection
  • the input port and the ground port are used to be driven by the data signal to emit light.
  • the voltage divider transistor is connected in series between the driving unit and the ground port.
  • the driving unit drives the light emitting unit to emit light according to the data signal when the voltage is divided by the voltage dividing transistor, so that when the data signal changes, the current in the light emitting unit can slowly increase, reducing the power received by the driving unit
  • the change of the current in the light-emitting unit caused by the change of the data signal of the pixel drive circuit can realize the display control under high gray scale, and because the resistance value of the voltage divider transistor can be changed by adjusting the power supply voltage, This makes the pixel driving circuit have higher real-time controllability.
  • FIG. 1 is a schematic structural diagram of a pixel driving circuit provided by an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a detailed structure of a pixel driving circuit provided by an embodiment of the present invention.
  • FIG. 3 a is a characteristic curve diagram of a voltage divider transistor in a pixel driving circuit provided by an embodiment according to the present invention.
  • FIG. 3b is another characteristic curve diagram of the voltage dividing transistor of the pixel driving circuit provided by the embodiment according to the present invention.
  • Fig. 4a is a characteristic curve diagram of the MOS transistor T3 before the voltage dividing transistor is connected in series in the pixel driving circuit provided by the embodiment according to the present invention.
  • FIG. 4b is a characteristic curve diagram of the MOS transistor T3 after the voltage divider transistors are connected in series in the pixel driving circuit provided by the embodiment of the present invention.
  • Fig. 5 is a schematic structural diagram of a mobile terminal provided by an embodiment according to the present invention.
  • FIG. 6 is a schematic diagram of a detailed structure of a mobile terminal provided by an embodiment of the present invention.
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • a feature defined as “first” or “second” may explicitly or implicitly include one or more of said features.
  • “plurality” means two or more, unless otherwise specifically defined.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction of two components relation.
  • installation connection
  • connection connection
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction of two components relation.
  • a first feature being “on” or “under” a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them.
  • “above”, “above” and “above” the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.
  • “Below”, “beneath” and “under” the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
  • the present invention is aimed at the pixel drive circuit with MOS tube as the driving transistor under the existing design, because a small change in the data voltage received by the gate of the MOS tube will cause a large change in the current of the drain, which leads to the design
  • FIG. 1 is a schematic structural diagram of a pixel driving circuit 10 provided according to an embodiment of the present invention. From FIG. 1, it is possible to intuitively see various components of the embodiment according to the present invention. and the relative positional relationship of each component.
  • the pixel driving circuit 10 is applied to a display panel, the display panel includes scanning lines and data lines, the pixel driving circuit 10 includes a switching thin film transistor T1, a storage module 11 electrically connected to the switching thin film transistor T1, and a driving light emitting module 12.
  • the switching thin film transistor T1 is used to receive the data signal DATA on the data line according to the scanning signal SCAN on the scanning line, so that the storage module 11 is charged by the data signal DATA, and the driving light-emitting module 12 is driven by the data signal DATA to emit light.
  • the driving light-emitting module 12 includes a driving unit 13, a light-emitting unit 14, and a voltage dividing transistor T2 connected in series.
  • the driving light-emitting module 12 has a power supply voltage access port 1 and a grounding port 2.
  • the voltage dividing transistor T2 is connected in series to the driving unit 13 and the grounding port 2. between.
  • the drive unit 13 is divided by the voltage divider transistor T2, according to the data
  • the signal DATA drives the light-emitting unit 14 to emit light, so that when the data signal DATA changes, the current in the light-emitting unit 14 can increase slowly, reducing the current in the light-emitting unit 14 caused by the change of the data signal DATA received by the driving unit 13.
  • the change of the current makes the pixel driving circuit 10 realize the display control under high grayscale.
  • the resistance value of the voltage dividing transistor T2 can be changed by adjusting the power supply voltage VDD, the pixel driving circuit 10 has a higher Real-time controllability.
  • FIG. 2 is a schematic diagram of the detailed structure of the pixel driving circuit 10 provided by the embodiment of the present invention. From FIG. 2, it can be seen intuitively that the embodiment of the present invention Each component, and the relative positional relationship of each component.
  • the above-mentioned storage module 11 includes a capacitor Cs
  • the above-mentioned driving unit 13 includes a MOS transistor T3
  • the above-mentioned light emitting unit 14 includes four light-emitting diodes LED, wherein:
  • the gate of the switching TFT T1 is electrically connected to the scan line
  • the drain of the switching TFT T1 is electrically connected to the data line
  • the source of the switching TFT T1 is electrically connected to one end of the capacitor Cs and the gate of the MOS transistor T3.
  • the switching thin film transistor T1 can be an amorphous silicon thin film transistor (a-Si TFT), or an indium gallium zinc oxide thin film transistor (IGZO TFT), and in this embodiment, the pixel driving circuit 10 only includes one switching thin film transistor T1, but in other embodiments formed by the present invention, the pixel driving circuit 10 may also include multiple switching thin film transistors, multiple switches The thin film transistors may be connected in series or in parallel, and the gate of each switching thin film transistor is electrically connected to the scanning line, and in an embodiment where a plurality of switching thin film transistors are connected in parallel, the drain of each switching thin film transistor Both electrodes are used to connect to the data signal DATA; in an embodiment in which a plurality of switching thin film transistors are connected in series, the drain of one of the plurality of switching thin film transistors is connected to the data signal DATA.
  • a-Si TFT amorphous silicon thin film transistor
  • IGZO TFT indium gallium zinc oxide thin film transistor
  • the storage module 11 only includes one capacitor, but in other embodiments of the present invention, the storage module 11 may also include multiple capacitors, and the multiple capacitors may be connected in series or Can be connected in parallel.
  • each capacitor is electrically connected to the gate of the MOS transistor T3 and the source of the switching thin film transistor T1, and the other end is electrically connected to the ground port 2; when multiple capacitors are connected in series In the connected embodiment, one end of one of the plurality of capacitors is electrically connected to the gate of the MOS transistor T3 and the source of the switching thin film transistor T1 , and one end of the other of the plurality of capacitors is electrically connected to the ground port 2 .
  • the gate of the MOS transistor T3 is electrically connected to the source of the switching thin film transistor T1 and one end of the capacitor Cs, the drain of the MOS transistor T3 is electrically connected to the cathode of the light-emitting diode LED, and the source of the MOS transistor T3 is electrically connected to the voltage dividing transistor T2 , and the MOS transistor T3 is used as a driving transistor in the pixel driving circuit 10 .
  • the light-emitting unit 14 includes four light-emitting diodes LEDs connected in series, but in other embodiments formed by the present invention, the number of light-emitting diodes LEDs in the light-emitting unit 14 can also be other values , and in this embodiment, the light-emitting unit 14 is connected in series between the power supply voltage access port 1 and the drive unit 13, but in other embodiments of the present invention, the light-emitting unit 14 can also be connected in series between the drive unit 13 and the ground between port 2.
  • the voltage dividing transistor T2 is connected in series between the drive unit 13 and the ground port 2.
  • the voltage dividing transistor T2 is a voltage dividing thin film transistor, and the gate and drain of the voltage dividing thin film transistor are electrically connected, and are connected to the MOS transistor T3
  • the source of the voltage-dividing thin film transistor is electrically connected to the ground port 2 .
  • Figure 3a shows the law of the source-drain current (Id) changing with the source-drain voltage (Vdrain) when the gate and drain of the voltage-dividing transistor T2 are electrically connected.
  • the voltage-dividing transistor T2 When the source-drain voltage (Vdrain) increases from zero, the voltage divider transistor T2 works in the linear region, and its source-drain current (Id) increases with the increase of the source-drain voltage (Vdrain). When the source-drain voltage (Vdrain ) further increases to a certain value, the voltage divider transistor T2 works in the saturation region, and its source-drain current (Id) no longer increases with the increase of the source-drain voltage (Vdrain), but tends to a certain value; 3b shows how the resistance R varies with the source-drain voltage (Vdrain) when the gate and drain of the voltage dividing transistor T2 are electrically connected.
  • the voltage dividing thin film transistor may be an amorphous silicon thin film transistor (a-Si TFT) or an indium gallium zinc oxide thin film transistor (IGZO TFT), and in this embodiment, the pixel driving circuit 10 includes only one voltage-dividing transistor T2, but in other embodiments of the present invention, the pixel driving circuit 10 may also include multiple voltage-dividing transistors, and the multiple voltage-dividing transistors may be connected in series or in parallel. Further, in other embodiments of the present invention, the voltage-dividing transistor T2 may be a voltage-dividing crystal diode.
  • the switching thin film transistor T1 is turned on, and the data signal DATA enters the drain of the switching thin film transistor T1 into the MOS transistor T3.
  • the gate and the capacitor Cs after that, the switching thin film transistor T1 is turned off, but due to the storage function of the capacitor Cs, the gate voltage of the MOS transistor T3 can still maintain the potential of the data signal DATA, so that the MOS transistor T3 is still in the conduction state,
  • the driving current enters the light-emitting diode LED through the MOS transistor T3, thereby driving the light-emitting diode LED to emit light.
  • FIG. 4a is a characteristic curve diagram of the MOS transistor T3 before the voltage divider transistor T2 is connected in series in the pixel driving circuit 10 provided by the embodiment according to the present invention.
  • FIG. 4b It is the pixel drive circuit provided by the embodiment of the present invention. After the voltage divider transistor T2 is connected in series, the characteristic curve of the MOS transistor T3.
  • the abscissa indicates the source and drain of the MOS transistor T3 Voltage (Uds)
  • its ordinate indicates the source-drain current (Ids) of MOS transistor T3
  • each curve indicates: when the gate-source voltage (Vgate) of MOS transistor T3 remains constant, its source-drain current (Ids) varies with the source The regularity of leakage voltage (Uds) change.
  • MOS transistor T3 when the gate-source voltage (Vgate) of MOS transistor T3 maintains a certain value, when its source-drain voltage (Uds) increases to a certain value, MOS transistor T3 will work in the constant current region (that is, the saturation region) , its source-drain current (Ids) no longer increases with the increase of the source-drain voltage (Uds), but tends to a certain value. Further, the greater the gate-source voltage (Vgate) of the MOS transistor T3, the greater the source-drain current (Ids) when it works in the constant current region.
  • the MOS transistor T3 works in the constant current region. At this time, if the source of the MOS transistor T3 and the ground terminal GND are not connected in series with the voltage dividing transistor T2, The gate-source voltage (Vgate) of the MOS transistor T3 is “DATA-GND”.
  • the drain of the MOS transistor T3 A large source-drain current (Ids) will be generated, which can easily exceed the maximum current allowed by the light-emitting diode LED, and a small change in the gate-source voltage (Vgate) of the MOS transistor T3 at a large value will cause The huge change of the source-drain current (Ids) is not conducive to the display control of the pixel driving circuit 10 in high gray scale.
  • the voltage divider transistor T2 is connected in series between the source of the MOS transistor T3 and the ground terminal GND, when the MOS transistor T3 receives the same grayscale voltage DATA, its gate-source voltage (Vgate) Due to being divided by the voltage divider transistor T2 (its resistance value is R), it is reduced to "DATA-GND-IR", which effectively reduces its source and drain current (Ids), and when the size of the data signal DATA occurs When changing, the variation range of the source-drain current (Ids) of the MOS transistor T3 is correspondingly reduced, so that the pixel driving circuit 10 can realize display control under high gray scale.
  • the pixel driving circuit 10 also includes a control module (not shown in the figure), which is used to adjust the power supply voltage VDD connected to the pixel driving circuit 10 so that the voltage dividing transistor T2 works in the linear region or the saturation region .
  • a control module (not shown in the figure), which is used to adjust the power supply voltage VDD connected to the pixel driving circuit 10 so that the voltage dividing transistor T2 works in the linear region or the saturation region .
  • the voltage-dividing transistor T2 can be operated in a linear region by adjusting the VDD voltage; when the MOS transistor T3 needs to be divided by a relatively small resistance
  • the voltage dividing transistor T2 can work in the saturation region by adjusting the VDD voltage.
  • the number of gray levels of the display panel is proportional to the resistance of the voltage divider transistor T2, that is, when the gray level of the display panel is higher, the resistance of the voltage divider transistor T2 is larger.
  • the voltage dividing transistor T2 is a voltage dividing thin film transistor
  • the ratio of its channel width to the channel length is proportional to the resistance of the voltage dividing thin film transistor, so the channel of the voltage dividing thin film transistor
  • the ratio of the width to the channel length is proportional to the number of gray levels of the display panel.
  • the voltage dividing transistor T2 has a first resistance value R
  • the light-emitting diode LED has a second resistance value R LED
  • the power supply connected to the pixel drive circuit 10 is The ratio of the voltage value VDD of the voltage to the sum of the first resistance value R and the second resistance value R LED is between the minimum driving current value I min and the maximum driving current value I max , that is, I min ⁇ VDD/(R +R LED ) ⁇ I max .
  • the present invention provides a pixel driving circuit 10, which is applied to a display panel.
  • the display panel includes scanning lines and data lines.
  • the pixel driving circuit 10 includes a switching thin film transistor T1, The storage module 11 and the driving light-emitting module 12, the switching thin film transistor T1 is used to receive the data signal DATA on the data line according to the scanning signal SCAN on the scanning line, so that the storage module 11 is charged by the data signal DATA, and the driving light-emitting module 12 is activated
  • the data signal DATA is driven to emit light, wherein the driving light emitting module 12 includes a driving unit 13, a light emitting unit 14 and a voltage dividing transistor T2 connected in series, the driving light emitting module 12 has a power supply voltage access port 1 and a grounding port 2, and the voltage dividing transistor T2 It is connected in series between the driving unit 13 and the grounding port 2.
  • the driving unit 13 is a voltage-dividing transistor T2.
  • the light-emitting unit 14 is driven to emit light according to the data signal DATA, so that when the data signal DATA changes, the current in the light-emitting unit 14 can increase slowly, reducing the change due to the data signal DATA received by the drive unit 13
  • the resulting change in the current in the light emitting unit 14 enables the pixel driving circuit 10 to realize display control at high gray scales.
  • the resistance value of the voltage dividing transistor T2 can be changed by adjusting the power supply voltage VDD, the The pixel driving circuit 10 has higher real-time controllability.
  • FIG. 5 is a schematic structural diagram of a mobile terminal provided according to an embodiment of the present invention.
  • the above-mentioned pixel driving circuit 10 is applied to the mobile terminal, which can be a smart phone or a tablet computer, etc., as shown in FIG.
  • the various components of the present invention and the relative positional relationship of each component can be seen intuitively.
  • the mobile terminal 100 includes a processor 101 and a memory 102 .
  • the processor 101 is electrically connected to the memory 102 .
  • the processor 101 is the control center of the mobile terminal 100. It uses various interfaces and lines to connect various parts of the entire mobile terminal. By running or loading the application program stored in the memory 102 and calling the data stored in the memory 102, the mobile terminal is executed. Various functions and processing data of the terminal, so as to monitor the mobile terminal as a whole.
  • Fig. 6 is a schematic diagram of the detailed structure of the mobile terminal provided by the embodiment of the present invention.
  • the mobile terminal can be a smart phone or a tablet computer, etc. From the figure, it can be seen intuitively that the present invention Each component, and the relative positional relationship of each component.
  • FIG. 6 shows a specific structural block diagram of the mobile terminal 100 provided by the embodiment of the present invention.
  • the mobile terminal 100 may include a radio frequency (RF, Radio Frequency) circuit 110, a memory 120 including one or more computer-readable storage media, an input unit 130, a display unit 140, a sensor 150, an audio circuit 160.
  • a transmission module 170 (such as wireless fidelity, WiFi, Wireless Fidelity), a processor 180 including one or more processing cores, and a power supply 190 and other components.
  • RF Radio Frequency
  • a transmission module 170 such as wireless fidelity, WiFi, Wireless Fidelity
  • a processor 180 including one or more processing cores
  • a power supply 190 and other components.
  • the RF circuit 110 is used to receive and send electromagnetic waves, realize mutual conversion between electromagnetic waves and electrical signals, and communicate with communication networks or other devices.
  • the RF circuit 110 may include various existing circuit components for performing these functions, such as antennas, radio frequency transceivers, digital signal processors, encryption/decryption chips, Subscriber Identity Module (SIM) cards, memory, and the like.
  • the RF circuit 110 can communicate with various networks such as the Internet, intranet, wireless network, or communicate with other devices through the wireless network.
  • the wireless network mentioned above may include a cellular telephone network, a wireless local area network or a metropolitan area network.
  • the wireless network mentioned above can use various communication standards, protocols and technologies, including but not limited to Global System for Mobile Communication (GSM), Enhanced Mobile Communication Technology (Enhanced Data GSM Environment, EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (Code Division Access, CDMA), time division multiple access technology (Time Division Multiple Access, TDMA), wireless fidelity technology (Wireless Fidelity, Wi-Fi) (such as the Institute of Electrical and Electronics Engineers standard IEEE 802.11a, IEEE 802.11b, IEEE802.11g and/or IEEE 802.11n), Voice over Internet Protocol (VoIP), Worldwide Interoperability for Microwave Access, Wi-Max), other protocols for mail, instant messaging, and short messaging, and any other suitable communication protocol, even those that have not yet been developed.
  • GSM Global System for Mobile Communication
  • EDGE Enhanced Mobile Communication Technology
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • Time Division Multiple Access Time Division Multiple Access
  • TDMA time division multiple access technology
  • Wi-Fi wireless
  • the memory 120 can be used to store software programs and modules, such as the corresponding program instructions in the above-mentioned audio power amplifier control method, and the processor 180 executes various functional applications and data processing by running the software programs and modules stored in the memory 120, that is, realizes The frequency of the information transmission signal transmitted by the mobile terminal 100 is acquired. Functions such as generating jamming signals.
  • the memory 120 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 120 may further include a memory remotely located relative to the processor 180, and these remote memories may be connected to the mobile terminal 100 through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • the input unit 130 can be used to receive input numbers or character information, and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.
  • the input unit 130 may include a touch-sensitive surface 131 and other input devices 132 .
  • the touch-sensitive surface 131 also referred to as a touch display screen or a touchpad, can collect user touch operations on or near it (for example, the user uses any suitable object or accessory such as a finger, a stylus, etc. on the touch-sensitive surface 131 or on operation near the touch-sensitive surface 131), and drive the corresponding connection device according to the preset program.
  • the touch-sensitive surface 131 may include two parts: a touch detection device and a touch controller.
  • the touch detection device detects the user's touch orientation, and detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and sends it to the to the processor 180, and can receive and execute commands sent by the processor 180.
  • the touch-sensitive surface 131 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave.
  • the input unit 130 may also include other input devices 132 .
  • other input devices 132 may include, but are not limited to, one or more of physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, and the like.
  • the display unit 140 can be used to display information input by or provided to the user and various graphical user interfaces of the mobile terminal 100, which can be composed of graphics, text, icons, videos and any combination thereof.
  • the display unit 140 may include a display panel 141.
  • the display panel 141 may be configured in the form of LCD (Liquid Crystal Display, Liquid Crystal Display), OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode), and the like.
  • the touch-sensitive surface 131 may cover the display panel 141, and when the touch-sensitive surface 131 detects a touch operation on or near it, the touch operation is sent to the processor 180 to determine the type of the touch event, and then the processor 180 determines the type of the touch event according to the type of the touch event.
  • the type provides a corresponding visual output on the display panel 141 .
  • the touch-sensitive surface 131 and the display panel 141 are used as two independent components to realize the input and output functions, in some embodiments, the touch-sensitive surface 131 and the display panel 141 can be integrated to realize the input and output functions. output function.
  • the mobile terminal 100 may also include at least one sensor 150, such as a light sensor, a motion sensor, and other sensors.
  • the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 141 according to the brightness of the ambient light, and the proximity sensor may generate an interruption when the flip is closed or closed.
  • the gravitational acceleration sensor can detect the magnitude of acceleration in various directions (generally three axes), and can detect the magnitude and direction of gravity when it is stationary, and can be used for applications that recognize the attitude of mobile phones (such as horizontal and vertical screen switching, related Games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tap), etc.; as for other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor, etc. that can also be configured on the mobile terminal 100, here No longer.
  • the audio circuit 160 , the speaker 161 and the microphone 162 can provide an audio interface between the user and the mobile terminal 100 .
  • the audio circuit 160 can transmit the electrical signal converted from the received audio data to the loudspeaker 161, and the loudspeaker 161 converts it into an audio signal output; After being received, it is converted into audio data, and then the audio data is processed by the output processor 180, and then sent to another terminal through the RF circuit 110, or the audio data is output to the memory 120 for further processing.
  • the audio circuit 160 may also include an earphone jack to provide communication between an external earphone and the mobile terminal 100 .
  • the mobile terminal 100 can help the user receive requests, send information, etc. through the transmission module 170 (such as the Wi-Fi module), which provides the user with wireless broadband Internet access.
  • the transmission module 170 is shown in the figure, it can be understood that it is not an essential component of the mobile terminal 100, and can be completely omitted as required without changing the essence of the invention.
  • the processor 180 is the control center of the mobile terminal 100. It uses various interfaces and lines to connect various parts of the entire mobile phone, and runs or executes software programs and/or modules stored in the memory 120, and calls data stored in the memory 120. , execute various functions and process data of the mobile terminal 100, so as to monitor the mobile terminal as a whole.
  • the processor 180 may include one or more processing cores; in some embodiments, the processor 180 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and applications, etc., and the modem processor mainly handles wireless communications. Understandably, the foregoing modem processor may not be integrated into the processor 180 .
  • the mobile terminal 100 also includes a power supply 190 (such as a battery) for supplying power to various components.
  • the power supply can be logically connected to the processor 180 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. Management and other functions.
  • the power supply 190 may also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and other arbitrary components.
  • the mobile terminal 100 also includes a camera (such as a front camera, a rear camera, etc.), a bluetooth module, a flashlight, etc., which will not be repeated here.
  • the display unit of the mobile terminal 100 is a touch screen display.
  • the present invention can also have other implementations. All technical solutions formed by equivalent replacement or equivalent replacement fall within the scope of protection required by the present invention.

Abstract

一种像素驱动电路（10）及移动终端，像素驱动电路（10）包括：用以根据扫描信号接收数据信号的开关薄膜晶体管（T1）、用以被数据信号充电的存储模块（11）、以及驱动发光模块（12），驱动发光模块（12）包括串联的驱动单元（13）、发光单元（14）以及分压晶体管（T2），且具有接地端口（2），用以被数据信号驱动而发光，分压晶体管（T2）串联于驱动单元（13）与接地端口（2）之间。

Description

像素驱动电路以及移动终端 技术领域
本发明涉及显示面板技术领域，尤其涉及一种像素驱动电路以及移动终端。
 背景技术
Mini-LED背光相比于传统背光，具有优异的对比度。目前的Mini-LED显示面板的驱动架构多以2T1C为主，而发光二极管（Light-Emitting Diode，LED）为电流驱动器件，有源矩阵驱动技术下的显示面板的背板信号为电压控制，因此，在这种技术下，对薄膜晶体管（Thin Film Transistor，TFT）器件的稳定性要求非常高，特别是用作驱动发光二极管的驱动薄膜晶体管的稳定性以及均一性会直接影响到发光二极管的发光亮度。
在现有设计下，通常是将金属氧化物半导体场效应晶体管（Metal-Oxide-Semiconductor Field-Effect Transistor，MOSFET，也即MOS管）作为像素驱动电路中的驱动晶体管，但是，由于金属氧化物半导体场效应晶体管主要工作在饱和区，其栅极接收到的数据电压发生的较小变化就会导致其漏极的电流发生较大变化，从而导致该设计下的像素驱动电路无法实现高灰阶下的显示控制。
 技术问题
本发明提供了一种像素驱动电路以及移动终端，有效地改善了像素驱动电路无法实现高灰阶下的显示控制的问题。
 技术解决方案
一方面，本发明提供了一种像素驱动电路，应用于显示面板，所述显示面板包括扫描线以及数据线，所述像素驱动电路包括：
开关薄膜晶体管，用以根据所述扫描线上的扫描信号接收所述数据线上的数据信号；
存储模块，与所述开关薄膜晶体管电连接，用以被所述数据信号充电；
驱动发光模块，包括串联连接的驱动单元、发光单元以及分压晶体管，且具有电源电压接入端口以及接地端口，用以被所述数据信号驱动而发光，其中，所述分压晶体管串联于所述驱动单元与所述接地端口之间。
进一步优选的，所述显示面板的灰阶级数与所述分压晶体管的阻值成正比。
进一步优选的，所述分压晶体管为分压薄膜晶体管，所述分压薄膜晶体管的栅极和漏极电连接，且所述分压薄膜晶体管的沟道宽度和沟道长度的比值与所述灰阶级数成正比。
进一步优选的，所述像素驱动电路还包括控制模块，所述控制模块用以对所述像素驱动电路接入的电源电压进行调节而使所述分压薄膜晶体管工作在线性区或饱和区。
进一步优选的，所述开关薄膜晶体管以及所述分压薄膜晶体管为非晶硅薄膜晶体管或铟镓锌氧化物薄膜晶体管。
进一步优选的，所述分压晶体管的数量为多个，多个所述分压晶体管串联连接及/或并联连接。
进一步优选的，所述存储单元包括电容，所述电容的一端与所述开关薄膜晶体管以及所述驱动发光模块电连接，所述电容的另一端与所述接地端口电连接。
进一步优选的，所述驱动单元包括金属氧化物半导体场效应管，所述金属氧化物半导体场效应管的栅极与所述开关薄膜晶体管以及所述存储模块电连接，所述金属氧化物半导体场效应管的漏极与所述电源电压接入端口电连接，所述金属氧化物半导体场效应管的源极与所述接地端口电连接。
进一步优选的，所述发光单元串联于所述电源电压接入端口与所述驱动单元之间，或串联于所述驱动单元与所述接地端口之间。
进一步优选的，所述分压晶体管具有第一阻值，所述发光单元包括发光二极管，所述发光二极管具有第二阻值、最小驱动电流值以及最大驱动电流值，所述像素驱动电路接入的电源电压的电压值与所述第一阻值以及所述第二阻值的和的比值介于所述最小驱动电流值以及所述最大驱动电流值之间。
进一步优选的，所述分压晶体管为分压晶体二极管。
另一方面，本发明还提供了一种移动终端，所述移动终端包括：
上述第一项所述的像素驱动电路；
栅极驱动器，连接于所述扫描线；以及，
源极驱动器，连接于所述数据线。
进一步优选的，所述显示面板的灰阶级数与所述分压晶体管的阻值成正比。
进一步优选的，所述分压晶体管为分压薄膜晶体管，所述分压薄膜晶体管的栅极和漏极电连接，且所述分压薄膜晶体管的沟道宽度和沟道长度的比值与所述灰阶级数成正比。
进一步优选的，所述像素驱动电路还包括控制模块，所述控制模块用以对所述像素驱动电路接入的电源电压进行调节而使所述分压薄膜晶体管工作在线性区或饱和区。
进一步优选的，所述开关薄膜晶体管以及所述分压薄膜晶体管为非晶硅薄膜晶体管或铟镓锌氧化物薄膜晶体管。
进一步优选的，所述存储单元包括电容，所述电容的一端与所述开关薄膜晶体管以及所述驱动发光模块电连接，所述电容的另一端与所述接地端口电连接。
进一步优选的，所述驱动单元包括金属氧化物半导体场效应管，所述金属氧化物半导体场效应管的栅极与所述开关薄膜晶体管以及所述存储模块电连接，所述金属氧化物半导体场效应管的漏极与所述电源电压接入端口电连接，所述金属氧化物半导体场效应管的源极与所述接地端口电连接。
进一步优选的，所述发光单元串联于所述电源电压接入端口与所述驱动单元之间，或串联于所述驱动单元与所述接地端口之间。
进一步优选的，所述分压晶体管具有第一阻值，所述发光单元包括发光二极管，所述发光二极管具有第二阻值、最小驱动电流值以及最大驱动电流值，所述像素驱动电路接入的电源电压的电压值与所述第一阻值以及所述第二阻值的和的比值介于所述最小驱动电流值以及所述最大驱动电流值之间。
 有益效果
本发明提供了一种像素驱动电路以及移动终端，该像素驱动电路应用于显示面板，显示面板包括扫描线以及数据线，像素驱动电路包括：用以根据扫描线上的扫描信号接收数据线上的数据信号的开关薄膜晶体管、与开关薄膜晶体管电连接且用以被数据信号充电的存储模块以及驱动发光模块，驱动发光模块包括串联连接的驱动单元、发光单元以及分压晶体管，且具有电源电压接入端口以及接地端口，用以被数据信号驱动而发光，其中，分压晶体管串联于驱动单元与接地端口之间，由于本发明提供的像素驱动电路在驱动单元与接地端口之间串联了一分压晶体管，使得驱动单元是在被分压晶体管分压的情况下，根据数据信号驱动发光单元发光，从而在数据信号发生变化时，发光单元中的电流可以缓慢增加，减小了由于驱动单元接收的数据信号的变化而带来的发光单元中的电流的变化，进而使得该像素驱动电路可以实现高灰阶下的显示控制，并且，由于可以通过调整电源电压而改变分压晶体管的阻值，使得该像素驱动电路具有更高的实时可控性。
 附图说明
为了更清楚地说明本发明的技术方案，下面将对根据本发明而成的各实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是根据本发明而成的实施例所提供的像素驱动电路的结构示意图。
图2是根据本发明而成的实施例所提供的像素驱动电路的细部结构示意图。
图3a是根据本发明而成的实施例所提供的像素驱动电路，其分压晶体管的特性曲线图。
图3b是根据本发明而成的实施例所提供的像素驱动电路，其分压晶体管的另一特性曲线图。
图4a是根据本发明而成的实施例所提供的像素驱动电路，在串联分压晶体管之前，MOS管T3的特性曲线图。
图4b是根据本发明而成的实施例所提供的像素驱动电路，在串联分压晶体管之后，MOS管T3的特性曲线图。
图5是根据本发明而成的实施例所提供的移动终端的结构示意图。
图6是根据本发明而成的实施例所提供的移动终端的细部结构示意图。
 本发明的实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
下文的公开提供了许多不同的实施方式或例子用来实现本发明的不同结构。为了简化本发明的公开，下文中对特定例子的部件和设置进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。此外，本发明提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
本发明针对现有设计下以MOS管作为驱动晶体管的像素驱动电路，由于MOS管的栅极接收到的数据电压发生的较小变化会导致其漏极的电流发生较大变化，从而导致该设计下的像素驱动电路无法实现高灰阶下的显示控制的问题，根据本发明而成的实施例用以解决该问题。
请参阅图1，图1是根据本发明而成的实施例所提供的像素驱动电路10的结构示意图，从图1中可以很直观的看到根据本发明而成的实施例的各组成部分，以及各组成部分的相对位置关系。
如图1所示，该像素驱动电路10应用于显示面板，显示面板包括扫描线以及数据线，像素驱动电路10包括开关薄膜晶体管T1、与开关薄膜晶体管T1电连接的存储模块11以及驱动发光模块12，开关薄膜晶体管T1用以根据扫描线上的扫描信号SCAN接收数据线上的数据信号DATA，而使存储模块11被数据信号DATA充电，并使驱动发光模块12被数据信号DATA驱动而发光，且其中：
驱动发光模块12包括串联连接的驱动单元13、发光单元14以及分压晶体管T2，驱动发光模块12具有电源电压接入端口1以及接地端口2，分压晶体管T2串联于驱动单元13与接地端口2之间。
需要说明的是，在本实施例中，由于在驱动单元13与接地端口2之间串联了一分压晶体管T2，使得该驱动单元13是在被分压晶体管T2分压的情况下，根据数据信号DATA驱动发光单元14发光，从而在数据信号DATA发生变化时，发光单元14中的电流可以缓慢增加，减小了由于驱动单元13接收的数据信号DATA的变化而带来的发光单元14中的电流的变化，进而使得该像素驱动电路10可以实现高灰阶下的显示控制，同时，由于可以通过调整电源电压VDD而改变分压晶体管T2的阻值，使得该像素驱动电路10具有更高的实时可控性。
进一步地，请参阅图2，图2是根据本发明而成的实施例所提供的像素驱动电路10的细部结构示意图，从图2中可以很直观的看到根据本发明而成的实施例的各组成部分，以及各组成部分的相对位置关系。
如图2所示，上述存储模块11包括电容Cs，上述驱动单元13包括MOS管T3，上述发光单元14包括四个发光二极管LED，其中：
开关薄膜晶体管T1的栅极与扫描线电连接，开关薄膜晶体管T1的漏极与数据线电连接，开关薄膜晶体管T1的源极与电容Cs的一端以及MOS管T3的栅极电连接。需要说明的是，该开关薄膜晶体管T1可以是为非晶硅薄膜晶体管（a-Si TFT），也可以是铟镓锌氧化物薄膜晶体管（IGZO TFT），且在本实施例中，像素驱动电路10只包括一个开关薄膜晶体管T1，但在由本发明而成的其他实施例中，像素驱动电路10也可以包括多个开关薄膜晶体管，多个开关薄膜晶体管可以是串联连接，也可以是并联连接，且每个开关薄膜晶体管的栅极均与扫描线电连接，且在多个开关薄膜晶体管并联连接的实施例中，每个开关薄膜晶体管的漏极均用以接入数据信号DATA；在多个开关薄膜晶体管串联连接的实施例中，多个开关薄膜晶体管中的一个的漏极接入数据信号DATA。
电容Cs的一端与MOS管T3的栅极以及开关薄膜晶体管T1的源极电连接，电容Cs的另一端与接地端口2电连接。需要说明的是，在本实施例中，存储模块11只包括一个电容，但在由本发明而成的其他实施例中，存储模块11也可以包括多个电容，多个电容可以是串联连接，也可以是并联连接。在多个电容并联连接的实施例中，且每个电容的一端均与MOS管T3的栅极以及开关薄膜晶体管T1的源极电连接，另一端与接地端口2电连接；在多个电容串联连接的实施例中，多个电容中的一个的一端与MOS管T3的栅极以及开关薄膜晶体管T1的源极电连接，且多个电容中的另一个的一端与接地端口2电连接。
MOS管T3的栅极与开关薄膜晶体管T1的源极以及电容Cs的一端电连接，MOS管T3的漏极与发光二极管LED的阴极电连接，MOS管T3的源极与分压晶体管T2电连接，且该MOS管T3用以作为像素驱动电路10中的驱动晶体管。
发光二极管LED的阳极与电源电压接入端口1电连接，发光二极管LED的阴极与MOS管T3的漏极电连接。需要说明的是，在本实施例中，发光单元14包括四个串联连接的发光二极管LED，但在由本发明而成的其他实施例中，发光单元14中发光二极管LED的数量也可以是其他数值，且在本实施例中，发光单元14串联于电源电压接入端口1与驱动单元13之间，但在由本发明而成的其他实施例中，发光单元14也可以串联于驱动单元13与接地端口2之间。
分压晶体管T2串联于驱动单元13与接地端口2之间，在本实施例中，分压晶体管T2为分压薄膜晶体管，分压薄膜晶体管的栅极和漏极电连接，并与MOS管T3的源极电连接，分压薄膜晶体管的源极与接地端口2电连接。图3a示出了在该分压晶体管T2的栅极和漏极电连接的情况下，其源漏电流（Id）随源漏电压（Vdrain）变化的规律，需要说明的是，当分压晶体管T2的源漏电压（Vdrain）从零开始增大时，分压晶体管T2工作在线性区，其源漏电流（Id）随源漏电压（Vdrain）的增大而增大，当源漏电压（Vdrain）进一步增大到一定值时，分压晶体管T2工作在饱和区，其源漏电流（Id）不再随源漏电压（Vdrain）的增大而增大，而是趋于某一定值；图3b示出了在该分压晶体管T2的栅极和漏极电连接的情况下，其阻值R随源漏电压（Vdrain）变化的规律。
需要说明的是，该分压薄膜晶体管可以是为非晶硅薄膜晶体管（a-Si TFT），也可以是铟镓锌氧化物薄膜晶体管（IGZO TFT），且在本实施例中，像素驱动电路10只包括一个分压晶体管T2，但在由本发明而成的其他实施例中，像素驱动电路10也可以包括多个分压晶体管，多个分压晶体管可以是串联连接，也可以是并联连接。进一步地，在由本发明而成的其他实施例中，分压晶体管T2可以是分压晶体二极管。
需要说明的是，在该像素驱动电路10工作期间，当扫描信号SCAN为高电平信号时，开关薄膜晶体管T1被导通，数据信号DATA经由开关薄膜晶体管T1的漏极进入到MOS管T3的栅极以及电容Cs，之后，开关薄膜晶体管T1截止，但由于电容Cs的存储作用，MOS管T3的栅极电压仍可继续保持数据信号DATA的电位，而使得MOS管T3仍处于导通状态，驱动电流通过MOS管T3进入发光二极管LED，从而驱动发光二极管LED发光。
需要说明的是，请参阅图4a以及图4b，图4a是根据本发明而成的实施例所提供的像素驱动电路10，在串联分压晶体管T2之前，MOS管T3的特性曲线图，图4b是根据本发明而成的实施例所提供的像素驱动电路，在串联分压晶体管T2之后，MOS管T3的特性曲线图，在图4a以及图4b中，其横坐标表示MOS管T3的源漏电压（Uds），其纵坐标表示MOS管T3的源漏电流（Ids），每一条曲线表示：在MOS管T3的栅源电压（Vgate）保持不变时，其源漏电流（Ids）随源漏电压（Uds）变化的规律。进一步地，在MOS管T3的栅源电压（Vgate）保持一定值时，当其源漏电压（Uds）增大到一定值时，MOS管T3便工作在恒流区（也即，饱和区），其源漏电流（Ids）不再随源漏电压（Uds）的增大而增大，而是趋于某一定值。进一步地，MOS管T3的栅源电压（Vgate）越大，其工作在恒流区时的源漏电流（Ids）也越大。
进一步地，由于像素驱动电路10在进行工作的期间，MOS管T3工作在恒流区，此时，在MOS管T3的源极与接地端GND之间未被串联分压晶体管T2的情况下，MOS管T3的栅源电压（Vgate）大小为“DATA-GND”，若像素驱动电路10接收到的灰阶电压较高时（也即，DATA电压较高），那么，在MOS管T3的漏极就会产生较大的源漏电流（Ids），极易超过发光二极管LED允许通过的最大电流，并且，MOS管T3的栅源电压（Vgate）在较大值处发生微小变化，就会导致极大的源漏电流（Ids）的变化，不利于使像素驱动电路10进行高灰阶下的显示控制。而在本实施例中，由于在MOS管T3的源极与接地端GND之间串联了分压晶体管T2，使得MOS管T3在接收到相同的灰阶电压DATA时，其栅源电压（Vgate）由于被分压晶体管T2（其阻值为R）分压而被减小至“DATA-GND-IR”，有效地减小了其源漏电流（Ids），并且，当数据信号DATA的大小发生变化时，MOS管T3的源漏电流（Ids）的变化幅度也相应地变小，从而使得该像素驱动电路10可以实现高灰阶下的显示控制。
进一步地，像素驱动电路10还包括控制模块（图中未示出），该控制模块用以对像素驱动电路10接入的电源电压VDD进行调节而使分压晶体管T2工作在线性区或饱和区。具体地，当需要使MOS管T3被较大阻值的分压晶体管T2进行分压时，可以通过调节VDD电压而使分压晶体管T2工作在线性区；当需要使MOS管T3被较小阻值的分压晶体管T2进行分压时，可以通过调节VDD电压而使分压晶体管T2工作在饱和区。
具体地，显示面板的灰阶级数与分压晶体管T2的阻值成正比，也即，当显示面板的灰阶级数越高，分压晶体管T2的阻值越大，当显示面板的灰阶级数越低，分压晶体管T2的阻值越小。具体地，在本实施例中，由于分压晶体管T2是分压薄膜晶体管，其沟道宽度和沟道长度的比值与分压薄膜晶体管的阻值成正比，所以，分压薄膜晶体管的沟道宽度和沟道长度的比值与显示面板的灰阶级数成正比。
进一步地，上述分压晶体管T2具有第一阻值R，上述发光二极管LED具有第二阻值R LED、最小驱动电流值I min以及最大驱动电流值I max，该像素驱动电路10接入的电源电压的电压值VDD与第一阻值R以及第二阻值R LED的和的比值介于最小驱动电流值I min以及最大驱动电流值之间I max，也即，I min<VDD/（R+R LED）<I max。
区别于现有技术，本发明提供了一种像素驱动电路10，应用于显示面板，显示面板包括扫描线以及数据线，该像素驱动电路10包括开关薄膜晶体管T1、与开关薄膜晶体管T1电连接的存储模块11以及驱动发光模块12，开关薄膜晶体管T1用以根据扫描线上的扫描信号SCAN接收数据线上的数据信号DATA，而使存储模块11被数据信号DATA充电，并使驱动发光模块12被数据信号DATA驱动而发光，其中，驱动发光模块12包括串联连接的驱动单元13、发光单元14以及分压晶体管T2，驱动发光模块12具有电源电压接入端口1以及接地端口2，分压晶体管T2串联于驱动单元13与接地端口2之间，由于本发明提供的像素驱动电路10在驱动单元13与接地端口2之间串联了一分压晶体管T2，使得该驱动单元13是在被分压晶体管T2分压的情况下，根据数据信号DATA驱动发光单元14发光，从而在数据信号DATA发生变化时，发光单元14中的电流可以缓慢增加，减小了由于驱动单元13接收的数据信号DATA的变化而带来的发光单元14中的电流的变化，进而使得该像素驱动电路10可以实现高灰阶下的显示控制，同时，由于可以通过调整电源电压VDD而改变分压晶体管T2的阻值，使得该像素驱动电路10具有更高的实时可控性。
请参阅图5，图5是根据本发明而成的实施例所提供的移动终端的结构示意图，上述像素驱动电路10应用于该移动终端，该移动终端可以为智能手机或平板电脑等，从图中可以很直观的看到本发明的各组成部分，以及各组成部分的相对位置关系。
如图5所示，移动终端100包括处理器101、存储器102。其中，处理器101与存储器102电性连接。
处理器101是移动终端100的控制中心，利用各种接口和线路连接整个移动终端的各个部分，通过运行或加载存储在存储器102内的应用程序，以及调用存储在存储器102内的数据，执行移动终端的各种功能和处理数据，从而对移动终端进行整体监控。
请参阅图6，图6是根据本发明而成的实施例所提供的移动终端的细部结构示意图，该移动终端可以为智能手机或平板电脑等，从图中可以很直观的看到本发明的各组成部分，以及各组成部分的相对位置关系。
图6示出了本发明实施例提供的移动终端100的具体结构框图。如图6所示，该移动终端100可以包括射频(RF，Radio Frequency)电路110、包括有一个或一个以上计算机可读存储介质的存储器120、输入单元130、显示单元140、传感器150、音频电路160、传输模块170（例如无线保真，WiFi，Wireless Fidelity)、包括有一个或者一个以上处理核心的处理器180、以及电源190等部件。本领域技术人员可以理解，图6中示出的移动终端结构并不构成对移动终端的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
RF电路110用于接收以及发送电磁波，实现电磁波与电信号的相互转换，从而与通讯网络或者其他设备进行通讯。RF电路110可包括各种现有的用于执行这些功能的电路组件，例如，天线、射频收发器、数字信号处理器、加密/解密芯片、用户身份模块（SIM）卡、存储器等等。RF电路110可与各种网络如互联网、企业内部网、无线网络进行通讯或者通过无线网络与其他设备进行通讯。上述的无线网络可包括蜂窝式电话网、无线局域网或者城域网。上述的无线网络可以使用各种通信标准、协议及技术，包括但并不限于全球移动通信系统（Global System for Mobile Communication, GSM）、增强型移动通信技术（Enhanced Data GSM Environment, EDGE)，宽带码分多址技术（Wideband Code Division Multiple Access, WCDMA），码分多址技术（Code Division Access, CDMA）、时分多址技术（Time Division Multiple Access, TDMA），无线保真技术（Wireless Fidelity， Wi-Fi）（如美国电气和电子工程师协会标准 IEEE 802.11a， IEEE 802.11b, IEEE802.11g 和/或 IEEE 802.11n）、网络电话（Voice over Internet Protocol, VoIP）、全球微波互联接入（Worldwide Interoperability for Microwave Access， Wi-Max）、其他用于邮件、即时通讯及短消息的协议，以及任何其他合适的通讯协议，甚至可包括那些当前仍未被开发出来的协议。
存储器120可用于存储软件程序以及模块，如上述音频功放控制方法中对应的程序指令，处理器180通过运行存储在存储器120内的软件程序以及模块，从而执行各种功能应用以及数据处理，即实现获取移动终端100带传输的信息传输信号的频率。生成干扰信号等功能。存储器120可包括高速随机存储器，还可包括非易失性存储器，如一个或者多个磁性存储装置、闪存、或者其他非易失性固态存储器。在一些实例中，存储器120可进一步包括相对于处理器180远程设置的存储器，这些远程存储器可以通过网络连接至移动终端100。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。
输入单元130可用于接收输入的数字或字符信息，以及产生与用户设置以及功能控制有关的键盘、鼠标、操作杆、光学或者轨迹球信号输入。具体地，输入单元130可包括触敏表面131以及其他输入设备132。触敏表面131，也称为触摸显示屏或者触控板，可收集用户在其上或附近的触摸操作（比如用户使用手指、触笔等任何适合的物体或附件在触敏表面131上或在触敏表面131附近的操作），并根据预先设定的程序驱动相应的连接装置。可选的，触敏表面131可包括触摸检测装置和触摸控制器两个部分。其中，触摸检测装置检测用户的触摸方位，并检测触摸操作带来的信号，将信号传送给触摸控制器；触摸控制器从触摸检测装置上接收触摸信息，并将它转换成触点坐标，再送给处理器180，并能接收处理器180发来的命令并加以执行。此外，可以采用电阻式、电容式、红外线以及表面声波等多种类型实现触敏表面131。除了触敏表面131，输入单元130还可以包括其他输入设备132。具体地，其他输入设备132可以包括但不限于物理键盘、功能键（比如音量控制按键、开关按键等）、轨迹球、鼠标、操作杆等中的一种或多种。
显示单元140可用于显示由用户输入的信息或提供给用户的信息以及移动终端100的各种图形用户接口，这些图形用户接口可以由图形、文本、图标、视频和其任意组合来构成。显示单元140可包括显示面板141，可选的，可以采用LCD(Liquid Crystal Display，液晶显示器)、OLED(Organic Light-Emitting Diode,有机发光二极管)等形式来配置显示面板141。进一步的，触敏表面131可覆盖显示面板141，当触敏表面131检测到在其上或附近的触摸操作后，传送给处理器180以确定触摸事件的类型，随后处理器180根据触摸事件的类型在显示面板141上提供相应的视觉输出。虽然在图中，触敏表面131与显示面板141是作为两个独立的部件来实现输入和输出功能，但是在某些实施例中，可以将触敏表面131与显示面板141集成而实现输入和输出功能。
移动终端100还可包括至少一种传感器150，比如光传感器、运动传感器以及其他传感器。具体地，光传感器可包括环境光传感器及接近传感器，其中，环境光传感器可根据环境光线的明暗来调节显示面板141的亮度，接近传感器可在翻盖合上或者关闭时产生中断。作为运动传感器的一种，重力加速度传感器可检测各个方向上（一般为三轴）加速度的大小，静止时可检测出重力的大小及方向，可用于识别手机姿态的应用（比如横竖屏切换、相关游戏、磁力计姿态校准）、振动识别相关功能（比如计步器、敲击）等; 至于移动终端100还可配置的陀螺仪、气压计、湿度计、温度计、红外线传感器等其他传感器，在此不再赘述。
音频电路160、扬声器161，传声器162可提供用户与移动终端100之间的音频接口。音频电路160可将接收到的音频数据转换后的电信号，传输到扬声器161，由扬声器161转换为声音信号输出；另一方面，传声器162将收集的声音信号转换为电信号，由音频电路160接收后转换为音频数据，再将音频数据输出处理器180处理后，经RF电路110以发送给比如另一终端，或者将音频数据输出至存储器120以便进一步处理。音频电路160还可能包括耳塞插孔，以提供外设耳机与移动终端100的通信。
移动终端100通过传输模块170（例如Wi-Fi模块）可以帮助用户接收请求、发送信息等，它为用户提供了无线的宽带互联网访问。虽然图中示出了传输模块170，但是可以理解的是，其并不属于移动终端100的必须构成，完全可以根据需要在不改变发明的本质的范围内而省略。
处理器180是移动终端100的控制中心，利用各种接口和线路连接整个手机的各个部分，通过运行或执行存储在存储器120内的软件程序和/或模块，以及调用存储在存储器120内的数据，执行移动终端100的各种功能和处理数据，从而对移动终端进行整体监控。可选的，处理器180可包括一个或多个处理核心；在一些实施例中，处理器180可集成应用处理器和调制解调处理器，其中，应用处理器主要处理操作系统、用户界面和应用程序等，调制解调处理器主要处理无线通信。可以理解地，上述调制解调处理器也可以不集成到处理器180中。
移动终端100还包括给各个部件供电的电源190（比如电池），在一些实施例中，电源可以通过电源管理系统与处理器180逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗管理等功能。电源190还可以包括一个或一个以上的直流或交流电源、再充电系统、电源故障检测电路、电源转换器或者逆变器、电源状态指示器等任意组件。
尽管未示出，移动终端100还包括摄像头（如前置摄像头、后置摄像头等）、蓝牙模块和手电筒等，在此不再赘述。具体在本实施例中，移动终端100的显示单元是触摸屏显示器。
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效替换形成的技术方案，均落在本发明要求的保护范围。
综上所述，虽然本发明已将优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种像素驱动电路，其中，应用于显示面板，所述显示面板包括扫描线以及数据线，所述像素驱动电路包括：
    开关薄膜晶体管，用以根据所述扫描线上的扫描信号接收所述数据线上的数据信号；
    存储模块，与所述开关薄膜晶体管电连接，用以被所述数据信号充电；
    驱动发光模块，包括串联连接的驱动单元、发光单元以及分压晶体管，且具有电源电压接入端口以及接地端口，用以被所述数据信号驱动而发光，其中，所述分压晶体管串联于所述驱动单元与所述接地端口之间。
  2. 根据权利要求1所述的像素驱动电路，其中，所述显示面板的灰阶级数与所述分压晶体管的阻值成正比。
  3. 根据权利要求2所述的像素驱动电路，其中，所述分压晶体管为分压薄膜晶体管，所述分压薄膜晶体管的栅极和漏极电连接，且所述分压薄膜晶体管的沟道宽度和沟道长度的比值与所述灰阶级数成正比。
  4. 根据权利要求3所述的像素驱动电路，其中，所述像素驱动电路还包括控制模块，所述控制模块用以对所述像素驱动电路接入的电源电压进行调节而使所述分压薄膜晶体管工作在线性区或饱和区。
  5. 根据权利要求3所述的像素驱动电路，其中，所述开关薄膜晶体管以及所述分压薄膜晶体管为非晶硅薄膜晶体管或铟镓锌氧化物薄膜晶体管。
  6. 根据权利要求1所述的像素驱动电路，其中，所述分压晶体管的数量为多个，多个所述分压晶体管串联连接及/或并联连接。
  7. 根据权利要求1所述的像素驱动电路，其中，所述存储单元包括电容，所述电容的一端与所述开关薄膜晶体管以及所述驱动发光模块电连接，所述电容的另一端与所述接地端口电连接。
  8. 根据权利要求1所述的像素驱动电路，其中，所述驱动单元包括金属氧化物半导体场效应管，所述金属氧化物半导体场效应管的栅极与所述开关薄膜晶体管以及所述存储模块电连接，所述金属氧化物半导体场效应管的漏极与所述电源电压接入端口电连接，所述金属氧化物半导体场效应管的源极与所述接地端口电连接。
  9. 根据权利要求1所述的像素驱动电路，其中，所述发光单元串联于所述电源电压接入端口与所述驱动单元之间，或串联于所述驱动单元与所述接地端口之间。
  10. 根据权利要求1所述的像素驱动电路，其中，所述分压晶体管具有第一阻值，所述发光单元包括发光二极管，所述发光二极管具有第二阻值、最小驱动电流值以及最大驱动电流值，所述像素驱动电路接入的电源电压的电压值与所述第一阻值以及所述第二阻值的和的比值介于所述最小驱动电流值以及所述最大驱动电流值之间。
  11. 根据权利要求1所述的像素驱动电路，其中，所述分压晶体管为分压晶体二极管。
  12. 一种移动终端，其中，所述移动终端包括：
    如权利要求1所述的像素驱动电路；
    栅极驱动器，连接于所述扫描线；以及，
    源极驱动器，连接于所述数据线。
  13. 根据权利要求12所述的移动终端，其中，所述显示面板的灰阶级数与所述分压晶体管的阻值成正比。
  14. 根据权利要求13所述的移动终端，其中，所述分压晶体管为分压薄膜晶体管，所述分压薄膜晶体管的栅极和漏极电连接，且所述分压薄膜晶体管的沟道宽度和沟道长度的比值与所述灰阶级数成正比。
  15. 根据权利要求14所述的移动终端，其中，所述像素驱动电路还包括控制模块，所述控制模块用以对所述像素驱动电路接入的电源电压进行调节而使所述分压薄膜晶体管工作在线性区或饱和区。
  16. 根据权利要求14所述的移动终端，其中，所述开关薄膜晶体管以及所述分压薄膜晶体管为非晶硅薄膜晶体管或铟镓锌氧化物薄膜晶体管。
  17. 根据权利要求12所述的移动终端，其中，所述存储单元包括电容，所述电容的一端与所述开关薄膜晶体管以及所述驱动发光模块电连接，所述电容的另一端与所述接地端口电连接。
  18. 根据权利要求12所述的移动终端，其中，所述驱动单元包括金属氧化物半导体场效应管，所述金属氧化物半导体场效应管的栅极与所述开关薄膜晶体管以及所述存储模块电连接，所述金属氧化物半导体场效应管的漏极与所述电源电压接入端口电连接，所述金属氧化物半导体场效应管的源极与所述接地端口电连接。
  19. 根据权利要求12所述的移动终端，其中，所述发光单元串联于所述电源电压接入端口与所述驱动单元之间，或串联于所述驱动单元与所述接地端口之间。
  20. 根据权利要求12所述的移动终端，其中，所述分压晶体管具有第一阻值，所述发光单元包括发光二极管，所述发光二极管具有第二阻值、最小驱动电流值以及最大驱动电流值，所述像素驱动电路接入的电源电压的电压值与所述第一阻值以及所述第二阻值的和的比值介于所述最小驱动电流值以及所述最大驱动电流值之间。
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