WO2021093050A1 - 显示面板的驱动电路及驱动方法 - Google Patents

显示面板的驱动电路及驱动方法 Download PDF

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Publication number
WO2021093050A1
WO2021093050A1 PCT/CN2019/122927 CN2019122927W WO2021093050A1 WO 2021093050 A1 WO2021093050 A1 WO 2021093050A1 CN 2019122927 W CN2019122927 W CN 2019122927W WO 2021093050 A1 WO2021093050 A1 WO 2021093050A1
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WIPO (PCT)
Prior art keywords
thin film
film transistor
circuit unit
driving circuit
electrically connected
Prior art date
Application number
PCT/CN2019/122927
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English (en)
French (fr)
Inventor
葛世民
Original Assignee
深圳市华星光电半导体显示技术有限公司
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Application filed by 深圳市华星光电半导体显示技术有限公司 filed Critical 深圳市华星光电半导体显示技术有限公司
Priority to US16/624,219 priority Critical patent/US20210335267A1/en
Publication of WO2021093050A1 publication Critical patent/WO2021093050A1/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
    • G09G3/36—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 using liquid crystals
    • 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]
    • G09G3/3266—Details of drivers for scan electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a driving circuit and a driving method of a display panel.
  • LCD Liquid crystal display
  • Miniature light-emitting diodes are used in LCD backlights, which can significantly improve the brightness, color gamut and contrast of the LCD, and improve the display effect of the LCD.
  • the most widely used existing driving method is usually a fractional active driving method, which has a lower cost.
  • the active driving circuit often needs to drive the thin film transistor (Thin film transistor, TFT), however, the working current of the TFT is usually maintained at a certain high working current during the driving process.
  • the TFT device continues to be driven at a high current, due to the accumulation of thermal effects, the electrical properties of the TFT and other devices Significant deterioration will occur, affecting the working stability of the thin film transistor, resulting in attenuation of brightness, and further affecting the display effect of the display panel.
  • the driving circuit drives devices such as miniature light-emitting diodes
  • the working current of the TFT is usually continuously maintained above a certain high working current, and the TFT and other devices are significantly deteriorated due to thermal effects, and the stability is reduced , which ultimately affects the display effect of the display panel.
  • the present disclosure provides a driving circuit and a driving method for a display panel, so as to solve the problem that the driving current in the TFT device is too large when the driving circuit in the existing display panel is driven, and the TFT and other devices are easy to generate heat, which makes the device stability Decrease, the display quality and display effect are not ideal.
  • a driving circuit for a display panel including:
  • a drive circuit unit, the scan line and the data line are respectively connected to a drive circuit unit, and the drive circuit unit includes a first drive circuit unit and a second drive circuit unit;
  • the cathode of the light-emitting diode is electrically connected to the drive circuit unit, and the anode of the light-emitting diode is connected to the power supply voltage;
  • the first drive circuit unit and the second drive circuit unit when the drive circuit unit is driven, the first drive circuit unit and the second drive circuit unit periodically alternately drive and work to drive and supply the light emitting diode;
  • the driving periods of the first driving circuit unit and the second driving circuit unit are the same, and each driving period is 10 ms.
  • the first driving circuit unit includes a first capacitor, a first thin film transistor (T1), and a second thin film transistor (T2)
  • the second driving circuit unit includes a second capacitor, a third thin film transistor Transistor (T3) and the fourth thin film transistor (T4);
  • the gate of the first thin film transistor (T1) is electrically connected to the first scan line, its source is electrically connected to the data line, and its drain is electrically connected to the gate of the second thin film transistor (T2) And one end of the first capacitor, and the other end of the first capacitor is grounded;
  • the gate of the second thin film transistor (T2) is electrically connected to the drain of the first thin film transistor (T1), the source is grounded, and the drain is electrically connected to the cathode of the organic light emitting diode And the drain of the third thin film transistor (T3);
  • the gate of the third thin film transistor (T3) is electrically connected to the drain of the fourth thin film transistor (T4) and one end of the second capacitor, and its drain is electrically connected to the second thin film transistor (T2).
  • the drain and the cathode of the organic light emitting diode, the source of which is grounded, and the other end of the second capacitor is grounded;
  • the gate of the fourth thin film transistor (T4) is electrically connected to the second scan line, its source is electrically connected to the data line, and its drain is electrically connected to the third thin film transistor (T3).
  • the gate and one end of the second capacitor is electrically connected to the second scan line, its source is electrically connected to the data line, and its drain is electrically connected to the third thin film transistor (T3).
  • the capacitance value of the first capacitor is the same as the capacitance value of the second capacitor.
  • the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), and the fourth thin film transistor (T4) are all N-type Thin film transistors.
  • the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), and the fourth thin film transistor (T4) include oxide thin films Transistor or amorphous silicon thin film transistor.
  • the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), and the fourth thin film transistor (T4) are of top gate type Thin film transistors.
  • a driving circuit for a display panel including:
  • a drive circuit unit, the scan line and the data line are respectively connected to a drive circuit unit, and the drive circuit unit includes a first drive circuit unit and a second drive circuit unit;
  • the cathode of the light-emitting diode is electrically connected to the drive circuit unit, and the anode of the light-emitting diode is connected to the power supply voltage;
  • the first drive circuit unit and the second drive circuit unit when the drive circuit unit is driven, the first drive circuit unit and the second drive circuit unit periodically alternately drive and work to drive and supply the light emitting diode.
  • the driving cycles of the driving circuit units are the same.
  • the first driving circuit unit includes a first capacitor, a first thin film transistor (T1), and a second thin film transistor (T2)
  • the second driving circuit unit includes a second capacitor, a third thin film transistor Transistor (T3) and the fourth thin film transistor (T4);
  • the gate of the first thin film transistor (T1) is electrically connected to the first scan line, its source is electrically connected to the data line, and its drain is electrically connected to the gate of the second thin film transistor (T2) And one end of the first capacitor, and the other end of the first capacitor is grounded;
  • the gate of the second thin film transistor (T2) is electrically connected to the drain of the first thin film transistor (T1), the source is grounded, and the drain is electrically connected to the cathode of the organic light emitting diode And the drain of the third thin film transistor (T3);
  • the gate of the third thin film transistor (T3) is electrically connected to the drain of the fourth thin film transistor (T4) and one end of the second capacitor, and its drain is electrically connected to the second thin film transistor (T2).
  • the drain and the cathode of the organic light emitting diode, the source of which is grounded, and the other end of the second capacitor is grounded;
  • the gate of the fourth thin film transistor (T4) is electrically connected to the second scan line, its source is electrically connected to the data line, and its drain is electrically connected to the third thin film transistor (T3).
  • the gate and one end of the second capacitor is electrically connected to the second scan line, its source is electrically connected to the data line, and its drain is electrically connected to the third thin film transistor (T3).
  • the capacitance value of the first capacitor is the same as the capacitance value of the second capacitor.
  • the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), and the fourth thin film transistor (T4) are all N-type Thin film transistors.
  • the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), and the fourth thin film transistor (T4) include oxide thin films Transistor or amorphous silicon thin film transistor.
  • the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), and the fourth thin film transistor (T4) are of top gate type Thin film transistors.
  • a driving method of a driving circuit including:
  • the data line provides a first control signal and a second control signal that appear periodically;
  • the first driving circuit unit in the driving circuit unit operates and drives the light emitting diode to emit light
  • the first driving circuit unit in the driving circuit unit stops working, and the second driving circuit unit operates and drives the light emitting diode to emit light.
  • control time of the first control signal and the second control signal are the same.
  • control time of the first control signal and the second control signal is less than 15 ms.
  • control time of the first control signal and the second control signal is 10 ms.
  • the first driving circuit unit and the second driving circuit unit periodically alternately drive and work to drive and supply the light emitting diode.
  • the present disclosure provides a driving circuit and a driving method for a display panel. After the thin film transistors in the driving circuit work continuously for a long time, the heat continuously accumulates and the stability of the circuit is reduced.
  • the embodiments of the present disclosure provide a plurality of driving circuit units, and Respectively control the working time of multiple drive circuit units, multiple drive circuit units periodically and alternately work, each drive circuit unit drives the light-emitting diode after a certain period of time to stop driving, and control the next drive circuit unit to work, so that the next drive The circuit unit drives the light emitting diode to work.
  • the thin film transistors in each driving circuit unit cannot accumulate heat during working hours, solving the problem of heat generation in the driving circuit, and improving the display quality of the display panel.
  • FIG. 1 is a schematic diagram of a driving circuit of a display panel according to an embodiment of the disclosure
  • FIG. 2 is a schematic diagram of the working condition of the driving circuit in the embodiment of the disclosure.
  • MOS devices are often not designed in the drive circuit.
  • the common drive circuit structure is two thin film transistors plus a capacitive structure, and connects the gate line and Data line to provide driving voltage.
  • the thin film transistor in the driving circuit needs to continue to work for a long time.
  • the temperature inside the thin film transistor rises, which affects the whole
  • the stability of the driving circuit causes the display quality of the panel to decrease.
  • FIG. 1 is a schematic diagram of a driving circuit of a display panel according to an embodiment of the disclosure.
  • the driving circuit includes a plurality of driving circuit units.
  • the driving circuit unit 101 and the driving circuit unit 102 are taken as examples for description.
  • the driving circuit includes a data line 103 and a first scan line 104 and a second scan line 105.
  • the data line 103 provides a data signal to control the turn-on or turn-off of the thin film transistor device in the driving circuit.
  • the driving circuit unit 101 includes a first thin film transistor T1, a second thin film transistor T2, and a first capacitor 106.
  • the gate of the first thin film transistor T1 is electrically connected to the first scan line 104
  • the source of the first thin film transistor T1 is electrically connected to the data line 103
  • the drain of the first thin film transistor T1 is electrically connected to the second
  • the gate of the thin film transistor T2 and one end of the first capacitor 106, and the other end of the first capacitor 106 is grounded.
  • the gate of the second thin film transistor T2 is electrically connected to the drain of the first thin film transistor T1, the source of the second thin film transistor T2 is grounded, and at the same time, the drain of the second thin film transistor T2 It is electrically connected to the cathode terminal of the organic light emitting diode 108 and connected to the drain of the third thin film transistor T3.
  • the anode of the organic light emitting diode 108 is connected to a power supply voltage, which may be a direct current voltage.
  • n When the driving circuit unit 101 is working, set n to be a positive integer.
  • the first scan line 104 provides scan signals line by line, while the data line 103 provides the first control signal, and the data control signal passes through the first scan line.
  • a thin film transistor T1 enters the gate of the second thin film transistor T2 and the first capacitor 106, and is stored in the first capacitor 106, so that the second thin film transistor T2 is kept on, forming a current and flowing through the organic
  • the light emitting diode 108 turns on the organic light emitting diode 108 and emits light, thereby realizing the driving of the driving circuit unit 101.
  • the driving circuit unit 102 includes a third thin film transistor T3 and a fourth thin film transistor T4, and a second capacitor 107.
  • the gate of the third thin film transistor T3 is electrically connected to the drain of the fourth thin film transistor and one end of the second capacitor 107, and the drain of the third thin film transistor T3 is electrically connected to the drain of the second thin film transistor T2 and
  • the cathode terminal of the organic light emitting diode 108 and the source of the third thin film transistor T3 are grounded, and the other terminal of the second capacitor 107 is grounded.
  • the gate of the fourth thin film transistor T4 is electrically connected to the second scan line 105
  • the source of the fourth thin film transistor T4 is electrically connected to the data line 103
  • the drain of the fourth thin film transistor T4 The electrode is electrically connected to the gate of the third thin film transistor T3 and one end of the second capacitor 107.
  • the driving chip controls the data control signal of the data line through the driving algorithm.
  • the second scan line 105 provides the scan signal line by line
  • the data line 103 provides the second The control signal
  • the data control signal enters the gate of the third thin film transistor T3 and the second capacitor 107 through the fourth thin film crystal T4, and is stored in the second capacitor 107, so that the third thin film transistor T3 is kept on. In turn, a current is formed.
  • the conductive circuit flows through the organic light-emitting diode 108 and causes it to emit light, thereby realizing the driving circuit The drive of the unit 102.
  • FIG. 2 is a schematic diagram of the operation of the driving circuit in the embodiment of the disclosure.
  • the data line 103 provides the first control signal and the first scan line 104 provides the scan signal, so that the driving circuit unit 101 works normally.
  • the light emitting diode 108 is turned on with the second thin film transistor T2, the light emitting diode 108 will not be turned on with the third thin film transistor T3, and the second thin film transistor T2 works normally.
  • the third thin film transistor T3 is in the off state, and the light emitting diode 108 emits light.
  • the data line 103 starts to provide the second control signal, the second thin film transistor T2 is turned off, the organic light emitting diode 108 and the second thin film transistor T2 are not conductive, and the organic light emitting diode 108 is connected to the second thin film transistor T2.
  • the three thin film transistors T3 are turned on.
  • the driving circuit unit 102 normally drives, but the driving circuit voltage 101 is not driven.
  • the first driving circuit unit 101 and the second driving circuit unit 102 are alternately driven periodically, and the first driving circuit unit 101 normally drives and works in the interval of t1 time period, and the second driving circuit unit 102 is not driven, and in the time period t2 During the interval, the first driving circuit unit 101 is not driven, and the second driving circuit unit 102 normally drives and works. Due to the short duration of time periods t1 and t2, the heat accumulated by the thin film transistors in each drive circuit unit during this time period is not enough to affect itself, and the self-heating of the thin film transistors cannot be electrically drifted, thus effectively The problem of low stability due to heat generation of thin film transistor devices is solved.
  • the time interval of the time period t1 and the time interval of the time period t2 may be the same or different, and set according to the specific parameters of the actual product.
  • the period T 10ms.
  • the switching period T is less than 15ms.
  • the thin film transistors in the embodiments of the present disclosure may all be N-type thin film transistors, and the N-type thin film transistors may include oxide thin film transistors or amorphous silicon thin film transistors.
  • the thin film transistor can also be a top-gate thin film transistor, and at the same time, the capacitance value of the capacitor in each driving circuit unit can be the same to ensure that the light emission brightness and display quality of the organic light emitting diode in different periods are the same when the organic light emitting diode emits light.
  • the driving circuit unit may further include a plurality of driving circuit units, and the plurality of driving circuit units are periodically converted to drive the organic light emitting diode to emit light, thereby solving the problem of heat accumulation of the thin film transistor during operation.
  • the embodiment of the present disclosure also adopts a driving method of a driving circuit.
  • different drive circuit units provide current and signals for the organic light emitting diode.
  • the data line provides the periodically changing first control signal and the second control signal.
  • the first driving circuit unit of the driving circuit unit operates to drive the light-emitting diode to emit light normally;
  • the first driving circuit unit is not driven, and the second driving unit starts to drive and conducts with the organic light-emitting diode to make the organic light-emitting diode normally emit light.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

本揭示提供一种显示面板的驱动电路及驱动方法，驱动电路包括扫描线、数据线、驱动电路单元以及发光二极管，驱动电路单元包括第一驱动电路单元和第二驱动电路单元，第一驱动电路单元和第二驱动电路单元周期***替驱动工作以使发光二极管发光。解决了薄膜晶体管自发热以及稳定性低的问题，提高了面板的显示质量。

Description

显示面板的驱动电路及驱动方法
本申请要求于2019年11月14日提交中国专利局、申请号为201911109851.9、发明名称为“显示面板的驱动电路及驱动方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本揭示涉及显示技术领域，尤其涉及一种显示面板的驱动电路及驱动方法。
 背景技术
液晶显示面板（liquid crystal display，LCD）由于比较轻薄，同时功耗低，已被广泛应用在各个领域之中。
微型发光二极管被应用于LCD的背光源之中，其可显著地提高LCD的亮度、色域和对比度，提高LCD的显示效果。在对微型发光二极管进行驱动时，现有的驱动方式中应用最广泛的通常为分位主动式驱动，这种驱动方式成本较低。其中主动式驱动电路往往要先驱动薄膜晶体管（Thin film transistor，TFT），但是，在驱动过程中TFT的工作电流通常持续维持在一定的高的工作电流之上，若TFT器件持续在高电流下驱动工作，由于热效应的积累，TFT等器件电性会发生显著的恶化，影响薄膜晶体管的工作稳定性，导致亮度的衰减，进而影响显示面板的显示效果。
因此需要对现有技术中的问题提出解决方法。
 技术问题
现有的显示面板中，其驱动电路在对微型发光二极管等器件进行驱动时，TFT的工作电流通常持续维持在一定的高的工作电流之上，TFT等器件由于热效应而显著恶化，稳定性降低，最终影响显示面板的显示效果。
 技术解决方案
本揭示提供一种显示面板的驱动电路及驱动方法，以解决现有的显示面板中的驱动电路在进行驱动时，TFT器件中的驱动电流过大，TFT等器件容易发热而使得器件的稳定性降低，显示质量及显示效果不理想。
为解决上述技术问题，本揭示实施例提供的技术方案如下：
根据本揭示实施例的第一方面，提供了一种显示面板的驱动电路，包括：
扫描线；
数据线；
驱动电路单元，所述扫描线与所述数据线分别与驱动电路单元相连接，所述驱动电路单元包括第一驱动电路单元和第二驱动电路单元；以及
发光二极管，所述发光二极管的阴极与所述驱动电路单元电性连接，所述发光二极管的阳极与电源电压连接；
其中，所述驱动电路单元驱动时，所述第一驱动电路单元和所述第二驱动电路单元周期***替驱动工作以对所述发光二极管驱动供电；
所述第一驱动电路单元与所述第二驱动电路单元的驱动周期相同，且每个所述驱动周期为10ms。
根据本揭示一实施例，所述第一驱动电路单元包括第一电容、第一薄膜晶体管（T1）和第二薄膜晶体管（T2），所述第二驱动电路单元包括第二电容、第三薄膜晶体管（T3）和第四薄膜晶体管（T4）；
所述第一薄膜晶体管（T1）的栅极电性连接于第一扫描线，其源极电性连接于所述数据线，其漏极电性连接于第二薄膜晶体管（T2）的栅极及所述第一电容的一端，所述第一电容的另一端接地；
所述第二薄膜晶体管（T2）的所述栅极电性连接于所述第一薄膜晶体管（T1）的所述漏极，其源极接地，其漏极电性连接于有机发光二极管的阴极和第三薄膜晶体管（T3）的漏极；
所述第三薄膜晶体管（T3）的栅极电性连接于第四薄膜晶体管（T4）的漏极及所述第二电容的一端，其漏极电性连接于第二薄膜晶体管（T2）的漏极及所述有机发光二极管的所述阴极，其源极接地，所述第二电容的另一端接地；
所述第四薄膜晶体管（T4）的栅极电性连接于第二扫描线，其源极电性连接于所述数据线，其漏极电性连接于所述第三薄膜晶体管（T3）的所述栅极及所述第二电容的一端。
根据本揭示一实施例，所述第一电容的电容值与所述第二电容的电容值相同。
根据本揭示一实施例，所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）均为N型薄膜晶体管。
根据本揭示一实施例，所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）包括氧化物薄膜晶体管或非晶硅薄膜晶体管。
根据本揭示一实施例，所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）为顶栅型薄膜晶体管。
根据本揭示实施例的第二方面，提供了一种显示面板的驱动电路，包括：
扫描线；
数据线；
驱动电路单元，所述扫描线与所述数据线分别与驱动电路单元相连接，所述驱动电路单元包括第一驱动电路单元和第二驱动电路单元；以及
发光二极管，所述发光二极管的阴极与所述驱动电路单元电性连接，所述发光二极管的阳极与电源电压连接；
其中，所述驱动电路单元驱动时，所述第一驱动电路单元和所述第二驱动电路单元周期***替驱动工作以对所述发光二极管驱动供电。
根据本揭示一实施例，所述驱动电路单元的驱动周期相同。
根据本揭示一实施例，所述第一驱动电路单元包括第一电容、第一薄膜晶体管（T1）和第二薄膜晶体管（T2），所述第二驱动电路单元包括第二电容、第三薄膜晶体管（T3）和第四薄膜晶体管（T4）；
所述第一薄膜晶体管（T1）的栅极电性连接于第一扫描线，其源极电性连接于所述数据线，其漏极电性连接于第二薄膜晶体管（T2）的栅极及所述第一电容的一端，所述第一电容的另一端接地；
所述第二薄膜晶体管（T2）的所述栅极电性连接于所述第一薄膜晶体管（T1）的所述漏极，其源极接地，其漏极电性连接于有机发光二极管的阴极和第三薄膜晶体管（T3）的漏极；
所述第三薄膜晶体管（T3）的栅极电性连接于第四薄膜晶体管（T4）的漏极及所述第二电容的一端，其漏极电性连接于第二薄膜晶体管（T2）的漏极及所述有机发光二极管的所述阴极，其源极接地，所述第二电容的另一端接地；
所述第四薄膜晶体管（T4）的栅极电性连接于第二扫描线，其源极电性连接于所述数据线，其漏极电性连接于所述第三薄膜晶体管（T3）的所述栅极及所述第二电容的一端。
根据本揭示一实施例，所述第一电容的电容值与所述第二电容的电容值相同。
根据本揭示一实施例，所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）均为N型薄膜晶体管。
根据本揭示一实施例，所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）包括氧化物薄膜晶体管或非晶硅薄膜晶体管。
根据本揭示一实施例，所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）为顶栅型薄膜晶体管。
根据本揭示实施例提供的第三方面，还提供一种驱动电路的驱动方法，包括：
数据线提供周期性出现的第一控制信号和第二控制信号；
在所述第一控制信号时段内，驱动电路单元内的第一驱动电路单元工作，并驱动发光二极管发光；
在所述第二控制信号时段内，所述驱动电路单元内的第一驱动电路单元停止工作，第二驱动电路单元工作并驱动所述发光二极管发光。
根据本揭示一实施例，所述第一控制信号与所述第二控制信号的控制时间相同。
根据本揭示一实施例，所述第一控制信号与所述第二控制信号的控制时间小于15ms。
根据本揭示一实施例，所述第一控制信号与所述第二控制信号的控制时间为10ms。
根据本揭示一实施例，所述第一驱动电路单元和所述第二驱动电路单元周期***替驱动工作以对所述发光二极管驱动供电。
 有益效果
本揭示提供一种显示面板的驱动电路及驱动方法，驱动电路中的薄膜晶体管在连续长时间工作后，热量不断积累而造成电路的稳定性降低，本揭示实施例提供多个驱动电路单元，并且分别控制多个驱动电路单元的工作时间，多个驱动电路单元周期***替工作，每一个驱动电路单元驱动发光二极管工作一定时间后即停止驱动，并控制下一个驱动电路单元工作，使下一个驱动电路单元驱动发光二极管工作。从而使得每个驱动电路单元内的薄膜晶体管在工作时间内热量无法积累，解决驱动电路内发热的问题，提高显示面板的显示质量。
 附图说明
图1为本揭示实施例的显示面板的驱动电路的示意图；
图2为本揭示实施例中驱动电路工作情况示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本揭示可用以实施的特定实施例。
在在微型发光二极管液晶显示面板中，为了降低生产成本，在其驱动电路中往往不设计MOS管器件，常见的驱动电路结构为两个薄膜晶体管外加一个电容式的结构，并连接栅极线和数据线以提供驱动电压。但是这种结构中，当面板长时间工作时，就需要驱动电路中的薄膜晶体管长时间持续工作，而在薄膜晶体管工作过程中，由于热效应的积累，导致薄膜晶体管内的温度上升，进而影响整个驱动电路的稳定性，导致面板的显示质量降低。
在本揭示的实施例中，本揭示实施例提供一种显示面板的驱动电路结构，解决驱动电路中薄膜晶体管热效应的问题。如图1所示，图1为本揭示实施例的显示面板的驱动电路的示意图。驱动电路包括多个驱动电路单元，本实施例中，以驱动电路单元101和驱动电路单元102为例进行说明。
驱动电路包括数据线103和第一扫描线104以及第二扫描线105。数据线103提供数据信号以控制驱动电路内的薄膜晶体管器件的开启或关闭。
具体的，驱动电路单元101包括第一薄膜晶体管T1、第二薄膜晶体管T2以及第一电容106。第一薄膜晶体管T1的栅极电性连接于第一扫描线104，第一薄膜晶体管T1的源极电性连接于数据线103，同时，第一薄膜晶体管T1的漏极电性连接于第二薄膜晶体管T2的栅极以及第一电容106的一端，第一电容106的另一端接地。
对于第二薄膜晶体管T2，第二薄膜晶体管T2的栅极电性连接于所述第一薄膜晶体T1的漏极，第二薄膜晶体管T2的源极接地，同时，第二薄膜晶体管T2的漏极电性连接于有机发光二极管108的阴极端以及连接于第三薄膜晶体管T3的漏极，同时，有机发光二极管108的阳极与电源电压相连接，所述电压可为直流电压。
当驱动电路单元101工作时，设n为正整数，在第n帧图像的显示时间内，第一扫描线104逐行提供扫描信号，同时数据线103提供第一控制信号，数据控制信号经过第一薄膜晶体管T1进入到第二薄膜晶体管T2的栅极以及第一电容106内，并存储于第一电容106中，使得第二薄膜晶体管T2保持导通的状态，形成电流并流过所述有机发光二极管108，使有机发光二极管108导通并发光，从而实现了驱动电路单元101的驱动。
进一步的，驱动电路单元102包括第三薄膜晶体管T3和第四薄膜晶体管T4以及第二电容107。第三薄膜晶体管T3的栅极电性连接于第四薄膜晶体管的漏极以及第二电容107的一端，所述第三薄膜晶体管T3的漏极电性连接于第二薄膜晶体管T2的漏极以及有机发光二极管108的阴极端，同时第三薄膜晶体管T3的源极接地，第二电容107的另一端接地。
对于第四薄膜晶体管T4，第四薄膜晶体管T4的栅极电性连接于第二扫描线105，第四薄膜晶体管T4的源极电性连接于数据线103，同时，第四薄膜晶体管T4的漏极电性连接于第三薄膜晶体管T3的栅极以及第二电容107的一端。
当驱动电路单元102工作时，驱动芯片通过驱动算法控制数据线的数据控制信号在第n+1帧图像的显示时间内，第二扫描线105逐行提供扫描信号，同时数据线103提供第二控制信号，数据控制信号经过第四薄膜晶体T4进入到第三薄膜晶体管T3的栅极以及第二电容107内，并存储在第二电容107中，使得第三薄膜晶体管T3保持导通的状态，进而形成电流，由于在驱动电路单元102工作时，第三薄膜晶体管T3的漏极与有机发光二极管108相连，因此，导通的电路流过有机发光二极管108并使其发光，从而实现了驱动电路单元102的驱动。
在本揭示实施例中，通过控制显示面板内驱动芯片以及数据线中数据信号的控制信号，即第一控制信号和第二控制信号，保证驱动电路单元101和驱动电路单元102不同时工作，如图2中所示，图2为本揭示实施例中驱动电路工作情况示意图。设定驱动电路单元101工作的时序为t1，在t1时间段内，数据线103提供第一控制信号以及第一扫描线104提供扫描信号，使得驱动电路单元101正常工作。具体的，发光二极管108与第二薄膜晶体管T2导通，发光二极管108不会与第三薄膜晶体管T3导通，第二薄膜晶体管T2正常工作，对应的，如图2所示，第三薄膜晶体管T3处于关闭状态，发光二极管108发光。
当t1时间结束，到达t2时间段内，数据线103开始提供第二控制信号，第二薄膜晶体管T2关闭，有机发光二极管108与第二薄膜晶体管T2之间不导通，有机发光二极管108与第三薄膜晶体管T3之间形成导通，此时，驱动电路单元102正常驱动工作，而驱动电路电压101不进行驱动。
从而，第一驱动电路单元101与第二驱动电路单元102周期性的交替驱动，在t1时间段间隔内第一驱动电路单元101正常驱动工作，第二驱动电路单元102不驱动，在t2时间段间隔内第一驱动电路单元101不驱动，第二驱动电路单元102正常驱动工作。由于，t1、t2时间段持续时间较短，每个驱动电路单元内的薄膜晶体管在此时间段内积累的热量不足以对自身造成影响，无法使薄膜晶体管自发热出现电性漂移，从而有效的解决了薄膜晶体管器件发热而稳定性低的问题。本揭示实施例中，t1时间段的时间间隔与t2时间段的时间间隔可相同或者不相同，根据实际产品的具体参数，进行设定。
在本揭示实施例中，优选的，t1=t2=10ms，即第一驱动电路单元101和第二驱动电路单元102均各自与有机发光二极管之间导通工作10ms，然后进行转换驱动，其工作周期T=10ms，优选的，为了避免薄膜晶体管在工作时间段内自发热量积累导致超过器件漂移的阈值，其转换周期T小于15ms。
同时，本揭示实施例中的薄膜晶体管可均为N型薄膜晶体管，所述N型薄膜晶体管可包括氧化物薄膜晶体管或者非晶硅薄膜晶体管。所述薄膜晶体管还可选取顶栅型薄膜晶体管，同时，每个驱动电路单元内的电容的电容值可相同，以保证有机发光二极管在发光时，不同周期内的发光亮度以及显示质量相同，上述驱动电路单元还可包括多个，多个驱动电路单元周期性转换以驱动有机发光二极管工作发光，从而解决薄膜晶体管在工作时热量积累的问题。
进一步的，本揭示实施例还通过一种驱动电路的驱动方法。通过周期性的转换驱动电路单元，在不同的周期内，由不同的驱动电路单元为有机发光二极管提供电流及信号。具体的，由数据线提供周期性变换的第一控制信号和第二控制信号，在第一控制信号时间段内，驱动电路单元的第一驱动电路单元工作，驱动发光二极管正常发光；在第二控制信号时间段内，第一驱动电路单元不驱动，而第二驱动单元开始进行驱动，并与有机发光二极管相互导通，使有机发光二极管正常发光。
以上对本揭示实施例所提供的一种显示面板的驱动电路及驱动方法进行了详细介绍，以上实施例的说明只是用于帮助理解本揭示的技术方案及其核心思想；本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，而这些修改或者替换，并不使相应技术方案的本质脱离本揭示各实施例的技术方案的范围。

Claims (18)

  1. 一种显示面板的驱动电路，包括：
    扫描线；
    数据线；
    驱动电路单元，所述扫描线与所述数据线分别与驱动电路单元相连接，所述驱动电路单元包括第一驱动电路单元和第二驱动电路单元；以及
    发光二极管，所述发光二极管的阴极与所述驱动电路单元电性连接，所述发光二极管的阳极与电源电压连接；
    其中，所述驱动电路单元驱动时，所述第一驱动电路单元和所述第二驱动电路单元周期***替驱动工作以对所述发光二极管驱动供电；
    所述第一驱动电路单元与所述第二驱动电路单元的驱动周期相同，且每个所述驱动周期为10ms。
  2. 根据权利要求1所述的显示面板的驱动电路，其中所述第一驱动电路单元包括第一电容、第一薄膜晶体管（T1）和第二薄膜晶体管（T2），所述第二驱动电路单元包括第二电容、第三薄膜晶体管（T3）和第四薄膜晶体管（T4）；
    所述第一薄膜晶体管（T1）的栅极电性连接于第一扫描线，其源极电性连接于所述数据线，其漏极电性连接于第二薄膜晶体管（T2）的栅极及所述第一电容的一端，所述第一电容的另一端接地；
    所述第二薄膜晶体管（T2）的所述栅极电性连接于所述第一薄膜晶体管（T1）的所述漏极，其源极接地，其漏极电性连接于有机发光二极管的阴极和第三薄膜晶体管（T3）的漏极；
    所述第三薄膜晶体管（T3）的栅极电性连接于第四薄膜晶体管（T4）的漏极及所述第二电容的一端，其漏极电性连接于第二薄膜晶体管（T2）的漏极及所述有机发光二极管的所述阴极，其源极接地，所述第二电容的另一端接地；
    所述第四薄膜晶体管（T4）的栅极电性连接于第二扫描线，其源极电性连接于所述数据线，其漏极电性连接于所述第三薄膜晶体管（T3）的所述栅极及所述第二电容的一端。
  3. 根据权利要求2所述的显示面板的驱动电路，其中所述第一电容的电容值与所述第二电容的电容值相同。
  4. 根据权利要求2所述的显示面板的驱动电路，其中所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）均为N型薄膜晶体管。
  5. 根据权利要求2所述的显示面板的驱动电路，其中所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）包括氧化物薄膜晶体管或非晶硅薄膜晶体管。
  6. 根据权利要求2所述的显示面板的驱动电路，其中所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）为顶栅型薄膜晶体管。
  7. 一种显示面板的驱动电路，包括：
    扫描线；
    数据线；
    驱动电路单元，所述扫描线与所述数据线分别与驱动电路单元相连接，所述驱动电路单元包括第一驱动电路单元和第二驱动电路单元；以及
    发光二极管，所述发光二极管的阴极与所述驱动电路单元电性连接，所述发光二极管的阳极与电源电压连接；
    其中，所述驱动电路单元驱动时，所述第一驱动电路单元和所述第二驱动电路单元周期***替驱动工作以对所述发光二极管驱动供电。
  8. 根据权利要求7所述的显示面板的驱动电路，其中所述第一驱动电路单元包括第一电容、第一薄膜晶体管（T1）和第二薄膜晶体管（T2），所述第二驱动电路单元包括第二电容、第三薄膜晶体管（T3）和第四薄膜晶体管（T4）；
    所述第一薄膜晶体管（T1）的栅极电性连接于第一扫描线，其源极电性连接于所述数据线，其漏极电性连接于第二薄膜晶体管（T2）的栅极及所述第一电容的一端，所述第一电容的另一端接地；
    所述第二薄膜晶体管（T2）的所述栅极电性连接于所述第一薄膜晶体管（T1）的所述漏极，其源极接地，其漏极电性连接于有机发光二极管的阴极和第三薄膜晶体管（T3）的漏极；
    所述第三薄膜晶体管（T3）的栅极电性连接于第四薄膜晶体管（T4）的漏极及所述第二电容的一端，其漏极电性连接于第二薄膜晶体管（T2）的漏极及所述有机发光二极管的所述阴极，其源极接地，所述第二电容的另一端接地；
    所述第四薄膜晶体管（T4）的栅极电性连接于第二扫描线，其源极电性连接于所述数据线，其漏极电性连接于所述第三薄膜晶体管（T3）的所述栅极及所述第二电容的一端。
  9. 根据权利要求8所述的显示面板的驱动电路，其中所述第一电容的电容值与所述第二电容的电容值相同。
  10. 根据权利要求8所述的显示面板的驱动电路，其中所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）均为N型薄膜晶体管。
  11. 根据权利要求8所述的显示面板的驱动电路，其中所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）包括氧化物薄膜晶体管或非晶硅薄膜晶体管。
  12. 根据权利要求8所述的显示面板的驱动电路，其中所述第一薄膜晶体管（T1）、所述第二薄膜晶体管（T2）、所述第三薄膜晶体管（T3）及所述第四薄膜晶体管（T4）为顶栅型薄膜晶体管。
  13. 根据权利要求7所述的显示面板的驱动电路，其中所述驱动电路单元的多个驱动周期相同。
  14. 一种显示面板的驱动电路的驱动方法，包括：
    数据线提供周期性出现的第一控制信号和第二控制信号；
    在所述第一控制信号时段内，驱动电路单元内的第一驱动电路单元工作，并驱动发光二极管发光；
    在所述第二控制信号时段内，所述驱动电路单元内的所述第一驱动电路单元停止工作，第二驱动电路单元工作并驱动所述发光二极管发光。
  15. 根据权利要求14所述的显示面板的驱动电路的驱动方法，其中所述第一控制信号与所述第二控制信号的控制时间相同。
  16. 根据权利要求15所述的显示面板的驱动电路的驱动方法，其中所述第一控制信号与所述第二控制信号的控制时间小于15ms。
  17. 根据权利要求16所述的显示面板的驱动电路的驱动方法，其中所述第一控制信号与所述第二控制信号的控制时间为10ms。
  18. 根据权利要求14所述的显示面板的驱动电路的驱动方法，其中所述第一驱动电路单元和所述第二驱动电路单元周期***替驱动工作以对所述发光二极管驱动供电。
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