WO2020124768A1 - 一种oled驱动芯片及其驱动方法 - Google Patents

一种oled驱动芯片及其驱动方法 Download PDF

Info

Publication number
WO2020124768A1
WO2020124768A1 PCT/CN2019/075565 CN2019075565W WO2020124768A1 WO 2020124768 A1 WO2020124768 A1 WO 2020124768A1 CN 2019075565 W CN2019075565 W CN 2019075565W WO 2020124768 A1 WO2020124768 A1 WO 2020124768A1
Authority
WO
WIPO (PCT)
Prior art keywords
thin film
film transistor
level
data signal
module
Prior art date
Application number
PCT/CN2019/075565
Other languages
English (en)
French (fr)
Inventor
梁鹏飞
Original Assignee
深圳市华星光电半导体显示技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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
Publication of WO2020124768A1 publication Critical patent/WO2020124768A1/zh

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]

Definitions

  • the present application relates to the field of display technology, in particular to an OLED driving chip and a driving method thereof.
  • the TFT Because the light emission of the OLED has a linear relationship with the current flowing, but due to the TFT process factors, the TFT is unstable, and the Vth (voltage) of the TFT is easy to drift, resulting in unevenness of the panel. If the TFT works in the linear region, its current is weakly related to the Vth of the TFT, so a picture with higher uniformity can be obtained. The current in the linear region has little correlation with Vth. Even if Vth drifts, it will not affect the current flowing through the TFT. However, since the current in the linear region is not divided into high and low levels, when you want to obtain different gray levels, you need to use the time axis to adjust, according to the length of time displayed, cut out the size of the gray level. However, this method increases the data transmission bandwidth for ordinary SD chips. Because the charging and discharging time is too fast, the slope of the source driver (Skew rate) is difficult to meet.
  • Skew rate slope of the source driver
  • the present application provides an OLED driving chip and a driving method thereof, which can increase the driving capability of the OLED driving chip, reduce bandwidth requirements, and save costs.
  • the present application provides a driving method of an OLED driving chip for driving a pixel circuit.
  • the OLED driving chip includes a shift register module, a first-level cache module, a second-level cache module, and multiplexing Circuit selection module;
  • the input terminal of the shift register module is connected to the upper-level clock signal, and is shifted according to the upper-level clock signal, and outputs the current-level clock signal to the first-level buffer module;
  • the first-level cache module accesses the RGB data signal, obtains the grayscale signal in the current-level RGB data signal according to the current-level clock signal, and outputs it to the second-level cache module;
  • the second-level cache module accesses the touch signal and outputs the stored gray-scale signal to the multiplexing circuit selection module according to the touch signal;
  • the multiplexing circuit selection module is connected to a power source, and the output terminal is connected to the pixel circuit; the multiplexing circuit selection module is converted into a logic state according to the grayscale signal and outputs a high level or a low level for Control the display time of the pixel unit to cut out different gray levels of the pixel unit.
  • the pixel circuit includes a data signal line and a gate signal line, and the output terminal of the multiplexing circuit selection module is connected to the data signal line.
  • the pixel circuit further includes a first thin film transistor, a second thin film transistor, a third thin film transistor, a storage capacitor, and an active light emitting diode;
  • the first gate of the first thin film transistor is connected to the gate signal line, the first source is connected to the data signal line, and the first drain is respectively connected to the first electrode plate of the storage capacitor and the The second gate connection of the second thin film transistor;
  • the second source electrode of the second thin film transistor is connected to the output terminal of the multiplexing circuit selection module, and the second drain electrode is connected to the anode of the active light emitting diode;
  • the third gate of the third thin film transistor is connected to the gate signal line, the third source is connected to the second electrode plate of the storage capacitor, and the third drain is connected to the reference voltage;
  • the cathode of the active light emitting diode is connected to the anode to control the display of the pixel unit.
  • the multiplexing circuit selection module when the multiplexing circuit selection module outputs a high level, the second thin film transistor is turned off, the pixel circuit is in a discharged state, and the active light emitting diode is in a dark state.
  • the data signal on the data signal line connected to the first thin film transistor is transferred to the third thin film transistor via the first drain through the storage capacitor to be discharged.
  • the multiplexing circuit selection module when the multiplexing circuit selection module outputs a low level, the second thin film transistor is turned on, the pixel circuit is in a charged state, and the active light emitting diode is turned on and in a bright state.
  • the data signal on the data signal line connected to the first thin film transistor is transmitted to the second thin film transistor via the first drain, and is transmitted by the second drain To the cathode of the active light emitting diode.
  • the present application also provides an OLED driver chip for driving a pixel circuit, including a shift register module, a first-level cache module, a second-level cache module, and a multiplexing circuit selection module;
  • the input terminal of the shift register module is connected to the upper-level clock signal, and after a clock period, the current-level clock signal is output to the first-level buffer module;
  • the first-level cache module accesses the RGB data signal, and obtains the grayscale signal in the current-level RGB data signal according to the current-level clock signal and outputs it to the second-level cache module;
  • the second-level cache module accesses the touch signal and outputs the stored gray-scale signal to the multiplexing circuit selection module according to the touch signal;
  • the multiplexing circuit selection module is connected to a power source, and the output terminal is connected to the pixel circuit; the multiplexing circuit selection module is converted into a logic state according to the grayscale signal and outputs a high level or a low level for Control the display time of the pixel unit to cut out different gray levels of the pixel unit.
  • the pixel circuit includes a data signal line and a gate signal line, and the output terminal of the multiplexing circuit selection module is connected to the data signal line.
  • the pixel circuit further includes a first thin film transistor, a second thin film transistor, a third thin film transistor, a storage capacitor, and an active light emitting diode;
  • the first gate of the first thin film transistor is connected to the gate signal line, the first source is connected to the data signal line, and the first drain is respectively connected to the first electrode plate of the storage capacitor and the The second gate connection of the second thin film transistor;
  • the second source electrode of the second thin film transistor is connected to the output terminal of the multiplexing circuit selection module, and the second drain electrode is connected to the anode of the active light emitting diode;
  • the third gate of the third thin film transistor is connected to the gate signal line, the third source is connected to the second electrode plate of the storage capacitor, and the third drain is connected to the reference voltage;
  • the cathode of the active light emitting diode is connected to the anode to control the display of the pixel unit.
  • the multiplexing circuit selection module when the multiplexing circuit selection module outputs a high level, the second thin film transistor is turned off, the pixel circuit is in a discharge state, and the active light emitting diode is in a dark state.
  • the data signal on the data signal line connected to the first thin film transistor is transmitted to the third thin film transistor via the first drain through the storage capacitor for discharge.
  • the multiplexing circuit selection module when the multiplexing circuit selection module outputs a low level, the second thin film transistor is turned on, the pixel circuit is in a charged state, and the active light emitting diode is turned on and in a bright state .
  • the data signal on the data signal line connected to the first thin film transistor is transmitted to the second thin film transistor via the first drain, and is transmitted by the second drain Transmitted to the cathode of the active light emitting diode.
  • the beneficial effects of the present application are: compared with the existing OLED driving chip, the OLED driving chip and the driving method provided by the present application, because the OLED driving chip only needs to output the high level or low level through the multiplexing circuit selection module , The bit depth is reduced to only two levels, which can greatly reduce the bandwidth. Because the data signal needs a higher refresh frequency, it needs to be quickly charged and discharged. Since the data signal line is directly connected to the power supply through the multiplexing circuit selection module, the driving ability of the OLED driver chip is enhanced. Therefore, the structure of the OLED driver chip is simple, and the driving capability is strong, which can greatly reduce the bandwidth requirements and save costs.
  • FIG. 1 is a schematic structural diagram of an OLED driving chip provided by an embodiment of the present application.
  • FIG. 2 is a pixel circuit diagram provided by an embodiment of the present application.
  • This application is directed to the prior art OLED driver chip. Since the charging and discharging time is too fast, there is a technical problem that the data transmission bandwidth of the SD chip is wide, and the slope of the source driver is difficult to meet. This embodiment can solve this defect.
  • FIG. 1 it is a schematic structural diagram of an OLED driver chip provided by an embodiment of the present application.
  • the OLED driving chip is used to drive the pixel circuit, and includes a shift register module 10, a first-level cache module 11, a second-level cache module 12, and a multiplexing circuit selection module 13.
  • the input terminal of the shift register module 10 is connected to the upper-level clock signal, and after one clock cycle, the current-level clock signal is output to the first-level buffer module 11; the first-level buffer module 11 is connected to RGB A data signal, and obtain the gray-scale signal in the RGB data signal of the current level according to the current-level clock signal, and output the gray-scale signal to the second-level cache module 12; the second-level cache module 12 Access the touch signal, and output the stored grayscale signal to the multiplexing circuit selection module 13 according to the touch signal; the multiplexing circuit selection module 13 is connected to a power source, and the multiplexing The output terminal of the circuit selection module 13 is connected to the pixel circuit; the multiplexing circuit selection module 13 is converted into a logic state according to the grayscale signal and outputs a high level or a low level for controlling the display time of the pixel unit Length to cut out different gray levels of the pixel unit.
  • the multiplexing circuit selection module 13 When the multiplexing circuit selection module 13 outputs a high level, the pixel circuit is in a discharged state, and the pixel unit is in a dark state. When the multiplexing circuit selection module 13 outputs a low level, the pixel circuit is in a charged state, and the pixel unit is in a bright state.
  • the present application also provides a driving method of the OLED driving chip.
  • FIG. 2 a pixel circuit diagram provided by an embodiment of the present application.
  • the pixel circuit includes a data signal line Date and a gate signal line Gate, and an output end of the multiplexing circuit selection module is connected to the data signal line Date.
  • the pixel circuit further includes a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, a storage capacitor Cst, and an active light emitting diode OLED.
  • the first gate of the first thin film transistor T1 is connected to the gate signal line Gate, the first source is connected to the data signal line Date, and the first drain is respectively connected to the first electrode of the storage capacitor Cst
  • the plate and the second gate of the second thin film transistor T2 are connected.
  • the second source of the second thin film transistor T2 is connected to the output terminal OVDD of the multiplexing circuit selection module, and the second drain is connected to the anode of the active light emitting diode OLED.
  • the third gate of the third thin film transistor T3 is connected to the gate signal line Gate, the third source is connected to the second electrode plate of the storage capacitor Cst, and the third drain is connected to the reference voltage Vref.
  • the cathode of the active light emitting diode OLED is connected to the anode to control the display of the pixel unit.
  • the multiplexing circuit selection module When the multiplexing circuit selection module outputs a high level, the second thin film transistor T2 is turned off, the pixel circuit is in a discharge state, and the active light emitting diode OLED is in a dark state.
  • the data signal on the data signal line Date connected to the first thin film transistor T1 is transmitted to the third thin film transistor T3 through the first drain through the storage capacitor Cst to be discharged.
  • the multiplexing circuit selection module When the multiplexing circuit selection module outputs a low level, the second thin film transistor T2 is turned on, the pixel circuit is in a charged state, and the active light emitting diode OLED is turned on and in a bright state.
  • the data signal on the data signal line Date connected to the first thin film transistor T1 is transmitted to the second thin film transistor T2 via the first drain, and is transmitted to the active from the second drain The cathode of the light emitting diode OLED.
  • the driving chip adopts PWM (Pulse-Width Modulation, Pulse Width Modulation) mode to output high level or low level to control the brightness of the active light emitting diode OLED to output gray scale
  • PWM Pulse-Width Modulation
  • Pulse Width Modulation Pulse Width Modulation
  • the original 8-bit bit depth is reduced to 1bit bit depth, which greatly reduces the width of the bandwidth.
  • the data signal line Date needs a higher refresh frequency, so it needs to be quickly charged and discharged. Since the data signal line Date is directly connected to the power supply through the multiplexing circuit selection module, the driving chip is enhanced Driving capacity.
  • the OLED driving chip and the driving method provided by the present application because the OLED driving chip only needs to output the high level or low level through the multiplexing circuit selection module, the bit depth is reduced to only two levels, which can greatly reduce the bandwidth. Because the data signal needs a higher refresh frequency, it needs to be quickly charged and discharged. Since the data signal line is directly connected to the power supply through the multiplexing circuit selection module, the driving ability of the OLED driver chip is enhanced. Therefore, the structure of the OLED driver chip is simple, and the driving capability is strong, which can greatly reduce the bandwidth requirements and save costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)

Abstract

一种OLED驱动芯片及其驱动方法,其中,移位寄存模块(10)用于向第一级缓存模块(11)输出当前级时钟信号;第一级缓存模块(11)根据当前级时钟信号获取灰阶信号并输出至第二级缓存模块(12);第二级缓存模块(12)用于向复用电路选择模块(13)输出灰阶信号;复用电路选择模块(13)根据灰阶信号输出高电平或低电平,以控制像素单元显示时间得到不同灰阶。

Description

一种OLED驱动芯片及其驱动方法 技术领域
本申请涉及显示技术领域,尤其涉及一种OLED驱动芯片及其驱动方法。
背景技术
由于OLED的发光与流过的电流成线性关系,但由于TFT制程因素,TFT不稳定,TFT的Vth(电压)容易漂移,造成面板不均匀。如果TFT工作在线性区,其电流与TFT的Vth成弱相关,因此可以获得均匀性较高的画面。在线性区的电流与Vth相关性不大,即使Vth飘移了,也不会影响流过TFT的电流。但由于线性区电流没有高低之分,因此要获得不同的灰阶时,需要用时间轴调节,根据显示的时间长短,切分出灰阶的大小。但采用这种方式对普通的SD芯片来说增大了数据传输的带宽,由于充放电的时间过快,对源极驱动器(Source)的斜率(Skew rate)是很难满足的。
因此,现有技术存在缺陷,急需改进。
技术问题
本申请提供一种OLED驱动芯片及其驱动方法,能够增大OLED驱动芯片的驱动能力,降低带宽需求,节约成本。
技术解决方案
为实现上述目的,本申请提供的技术方案如下:
本申请提供一种OLED驱动芯片的驱动方法,所述OLED驱动芯片用于对像素电路进行驱动,所述OLED驱动芯片包括移位寄存模块、第一级缓存模块、第二级缓存模块以及复用电路选择模块;
所述移位寄存模块的输入端接入上一级时钟信号,且根据所述上一级时钟信号进行移位,并输出当前级时钟信号至所述第一级缓存模块;
所述第一级缓存模块接入RGB数据信号,根据所述当前级时钟信号获取当前级所述RGB数据信号中的灰阶信号并输出至所述第二级缓存模块;
所述第二级缓存模块接入触控信号,并根据所述触控信号将存储的所述灰阶信号输出至所述复用电路选择模块;
所述复用电路选择模块接入电源,且输出端与所述像素电路连接;所述复用电路选择模块根据所述灰阶信号转换成逻辑状态并输出高电平或低电平,用于控制像素单元的显示时间长短以切分出所述像素单元的不同灰阶。
在本申请的驱动方法中,所述像素电路包括数据信号线与栅极信号线,所述复用电路选择模块的输出端与所述数据信号线连接。
在本申请的驱动方法中,所述像素电路还包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容以及有源发光二极管;
所述第一薄膜晶体管的第一栅极与所述栅极信号线连接,第一源极与所述数据信号线连接,第一漏极分别与所述存储电容的第一电极板以及所述第二薄膜晶体管的第二栅极连接;
所述第二薄膜晶体管的第二源极与所述复用电路选择模块的输出端连接,第二漏极与所述有源发光二极管的阳极连接;
所述第三薄膜晶体管的第三栅极与所述栅极信号线连接,第三源极与所述存储电容的第二电极板连接,第三漏极接入参考电压;
所述有源发光二极管的阴极与所述阳极连接,用于控制所述像素单元的显示。
在本申请的驱动方法中,当所述复用电路选择模块输出高电平时,所述第二薄膜晶体管关闭,所述像素电路处于放电状态,所述有源发光二极管处于暗态。
在本申请的驱动方法中,连接所述第一薄膜晶体管的所述数据信号线上的数据信号经由所述第一漏极通过所述存储电容传输至所述第三薄膜晶体管进行放电。
在本申请的驱动方法中,当所述复用电路选择模块输出低电平时,所述第二薄膜晶体管打开,所述像素电路处于充电状态,所述有源发光二极管导通并处于亮态。
在本申请的驱动方法中,连接所述第一薄膜晶体管的所述数据信号线上的数据信号经由所述第一漏极传输至所述第二薄膜晶体管,并由所述第二漏极传输至所述有源发光二极管的所述阴极。
为实现上述目的,本申请还提供一种OLED驱动芯片,用于对像素电路进行驱动,包括移位寄存模块、第一级缓存模块、第二级缓存模块以及复用电路选择模块;
所述移位寄存模块的输入端接入上一级时钟信号,经过一个时钟周期后并向所述第一级缓存模块输出当前级时钟信号;
所述第一级缓存模块接入RGB数据信号,并根据所述当前级时钟信号获取当前级所述RGB数据信号中的灰阶信号并输出至所述第二级缓存模块;
所述第二级缓存模块接入触控信号,并根据所述触控信号将存储的所述灰阶信号输出至所述复用电路选择模块;
所述复用电路选择模块接入电源,且输出端与所述像素电路连接;所述复用电路选择模块根据所述灰阶信号转换成逻辑状态并输出高电平或低电平,用于控制像素单元的显示时间长短以切分出所述像素单元的不同灰阶。
在本申请的OLED驱动芯片中,所述像素电路包括数据信号线与栅极信号线,所述复用电路选择模块的输出端与所述数据信号线连接。
在本申请的OLED驱动芯片中,所述像素电路还包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容以及有源发光二极管;
所述第一薄膜晶体管的第一栅极与所述栅极信号线连接,第一源极与所述数据信号线连接,第一漏极分别与所述存储电容的第一电极板以及所述第二薄膜晶体管的第二栅极连接;
所述第二薄膜晶体管的第二源极与所述复用电路选择模块的输出端连接,第二漏极与所述有源发光二极管的阳极连接;
所述第三薄膜晶体管的第三栅极与所述栅极信号线连接,第三源极与所述存储电容的第二电极板连接,第三漏极接入参考电压;
所述有源发光二极管的阴极与所述阳极连接,用于控制所述像素单元的显示。
在本申请的OLED驱动芯片中,当所述复用电路选择模块输出高电平时,所述第二薄膜晶体管关闭,所述像素电路处于放电状态,所述有源发光二极管处于暗态。
在本申请的OLED驱动芯片中,连接所述第一薄膜晶体管的所述数据信号线上的数据信号经由所述第一漏极通过所述存储电容传输至所述第三薄膜晶体管进行放电。
在本申请的OLED驱动芯片中,当所述复用电路选择模块输出低电平时,所述第二薄膜晶体管打开,所述像素电路处于充电状态,所述有源发光二极管导通并处于亮态。
在本申请的OLED驱动芯片中,连接所述第一薄膜晶体管的所述数据信号线上的数据信号经由所述第一漏极传输至所述第二薄膜晶体管,并由所述第二漏极传输至所述有源发光二极管的所述阴极。
有益效果
本申请的有益效果为:相较于现有的OLED驱动芯片,本申请提供的OLED驱动芯片及其驱动方法,由于OLED驱动芯片只需透过复用电路选择模块输出高电平或低电平,位深降至只有两级,可大大降低带宽。由于数据信号需要较高的刷新频率,因此需要快速充放电,由于数据信号线透过复用电路选择模块与电源直接相连,因此增强了OLED驱动芯片的驱动能力。从而使得OLED驱动芯片的架构简单,驱动能力较强,可大大降低带宽需求,节约成本。
附图说明
为了更清楚地说明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单介绍,显而易见地,下面描述中的附图仅仅是申请的一些实施例,对于本领域普通技术人员来讲,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为本申请实施例提供的OLED驱动芯片的构架示意图;
图2为本申请实施例提供的像素电路图。
本发明的实施方式
以下各实施例的说明是参考附加的图示,用以例示本申请可用以实施的特定实施例。本申请所提到的方向用语,例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等,仅是参考附加图式的方向。因此,使用的方向用语是用以说明及理解本申请,而非用以限制本申请。在图中,结构相似的单元是用以相同标号表示。
本申请针对现有技术的OLED驱动芯片,由于充放电的时间过快,存在SD芯片数据传输的带宽较宽,对源极驱动器的斜率很难满足的技术问题,本实施例能够解决该缺陷。
如图1所示,为本申请实施例提供的OLED驱动芯片的构架示意图。所述OLED驱动芯片用于对像素电路进行驱动,包括移位寄存模块10、第一级缓存模块11、第二级缓存模块12以及复用电路选择模块13。所述移位寄存模块10的输入端接入上一级时钟信号,经过一个时钟周期后并向所述第一级缓存模块11输出当前级时钟信号;所述第一级缓存模块11接入RGB数据信号,并根据所述当前级时钟信号获取当前级所述RGB数据信号中的灰阶信号,并将所述灰阶信号输出至所述第二级缓存模块12;所述第二级缓存模块12接入触控信号,并根据所述触控信号将存储的所述灰阶信号输出至所述复用电路选择模块13;所述复用电路选择模块13接入电源,且所述复用电路选择模块13的输出端与所述像素电路连接;所述复用电路选择模块13根据所述灰阶信号转换成逻辑状态并输出高电平或低电平,用于控制像素单元的显示时间长短以切分出所述像素单元的不同灰阶。
当所述复用电路选择模块13输出高电平时,所述像素电路处于放电状态,所述像素单元处于暗态。当所述复用电路选择模块13输出低电平时,所述像素电路处于充电状态,所述像素单元处于亮态。
在上述OLED驱动芯片的基础上,本申请还提供一种OLED驱动芯片的驱动方法,具体请结合图2所示,为本申请实施例提供的像素电路图。所述像素电路包括数据信号线Date与栅极信号线Gate,所述复用电路选择模块的输出端与所述数据信号线Date连接。所述像素电路还包括第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、存储电容Cst以及有源发光二极管OLED。所述第一薄膜晶体管T1的第一栅极与所述栅极信号线Gate连接,第一源极与所述数据信号线Date连接,第一漏极分别与所述存储电容Cst的第一电极板以及所述第二薄膜晶体管T2的第二栅极连接。所述第二薄膜晶体管T2的第二源极与所述复用电路选择模块的输出端OVDD连接,第二漏极与所述有源发光二极管OLED的阳极连接。所述第三薄膜晶体管T3的第三栅极与所述栅极信号线Gate连接,第三源极与所述存储电容Cst的第二电极板连接,第三漏极接入参考电压Vref。所述有源发光二极管OLED的阴极与所述阳极连接,用于控制所述像素单元的显示。
所述复用电路选择模块的输出级具有两级,即只输出高电平或低电平;TFT驱动工作在线性区,类于开关管作用。因此给出所述像素电路的数据信号只需要高电平或低电平两级。因此驱动芯片输出级只需要透过所述复用电路选择模块选择输出Vref0或者Vref1。例如Vref1 = 16V,Vref0 = 0V,当然此处并不做限定。
当所述复用电路选择模块输出高电平时,所述第二薄膜晶体管T2关闭,所述像素电路处于放电状态,所述有源发光二极管OLED处于暗态。连接所述第一薄膜晶体管T1的所述数据信号线Date上的数据信号经由所述第一漏极通过所述存储电容Cst传输至所述第三薄膜晶体管T3进行放电。
当所述复用电路选择模块输出低电平时,所述第二薄膜晶体管T2打开,所述像素电路处于充电状态,所述有源发光二极管OLED导通并处于亮态。连接所述第一薄膜晶体管T1的所述数据信号线Date上的数据信号经由所述第一漏极传输至所述第二薄膜晶体管T2,并由所述第二漏极传输至所述有源发光二极管OLED的所述阴极。
由于所述驱动芯片采用PWM(Pulse-WidthModulation,脉冲宽度调制)方式输出高电平或低电平来控制所述有源发光二极管OLED的亮暗从而输出灰阶,因此由原来8bit位深降至1bit位深,从而大大降低了带宽的宽度。另外,所述数据信号线Date需要较高的刷新频率,因此需要快速充放电,由于所述数据信号线Date透过所述复用电路选择模块与电源直接相连,因此,增强了所述驱动芯片的驱动能力。
本申请提供的OLED驱动芯片及其驱动方法,由于OLED驱动芯片只需透过复用电路选择模块输出高电平或低电平,位深降至只有两级,可大大降低带宽。由于数据信号需要较高的刷新频率,因此需要快速充放电,由于数据信号线透过复用电路选择模块与电源直接相连,因此增强了OLED驱动芯片的驱动能力。从而使得OLED驱动芯片的架构简单,驱动能力较强,可大大降低带宽需求,节约成本。
综上所述,虽然本申请已以优选实施例揭露如上,但上述优选实施例并非用以限制本申请,本领域的普通技术人员,在不脱离本申请的精神和范围内,均可作各种更动与润饰,因此本申请的保护范围以权利要求界定的范围为准。

Claims (14)

  1. 一种OLED驱动芯片的驱动方法,所述OLED驱动芯片用于对像素电路进行驱动,其中,所述OLED驱动芯片包括移位寄存模块、第一级缓存模块、第二级缓存模块以及复用电路选择模块;
    所述移位寄存模块的输入端接入上一级时钟信号,且根据所述上一级时钟信号进行移位,并输出当前级时钟信号至所述第一级缓存模块;
    所述第一级缓存模块接入RGB数据信号,根据所述当前级时钟信号获取当前级所述RGB数据信号中的灰阶信号并输出至所述第二级缓存模块;
    所述第二级缓存模块接入触控信号,并根据所述触控信号将存储的所述灰阶信号输出至所述复用电路选择模块;
    所述复用电路选择模块接入电源,且输出端与所述像素电路连接;所述复用电路选择模块根据所述灰阶信号转换成逻辑状态并输出高电平或低电平,用于控制像素单元的显示时间长短以切分出所述像素单元的不同灰阶。
  2. 根据权利要求1所述的驱动方法,其中,所述像素电路包括数据信号线与栅极信号线,所述复用电路选择模块的输出端与所述数据信号线连接。
  3. 根据权利要求2所述的驱动方法,其中,所述像素电路还包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容以及有源发光二极管;
    所述第一薄膜晶体管的第一栅极与所述栅极信号线连接,第一源极与所述数据信号线连接,第一漏极分别与所述存储电容的第一电极板以及所述第二薄膜晶体管的第二栅极连接;
    所述第二薄膜晶体管的第二源极与所述复用电路选择模块的输出端连接,第二漏极与所述有源发光二极管的阳极连接;
    所述第三薄膜晶体管的第三栅极与所述栅极信号线连接,第三源极与所述存储电容的第二电极板连接,第三漏极接入参考电压;
    所述有源发光二极管的阴极与所述阳极连接,用于控制所述像素单元的显示。
  4. 根据权利要求3所述的驱动方法,其中,当所述复用电路选择模块输出高电平时,所述第二薄膜晶体管关闭,所述像素电路处于放电状态,所述有源发光二极管处于暗态。
  5. 根据权利要求4所述的驱动方法,其中,连接所述第一薄膜晶体管的所述数据信号线上的数据信号经由所述第一漏极通过所述存储电容传输至所述第三薄膜晶体管进行放电。
  6. 根据权利要求3所述的驱动方法,其中,当所述复用电路选择模块输出低电平时,所述第二薄膜晶体管打开,所述像素电路处于充电状态,所述有源发光二极管导通并处于亮态。
  7. 根据权利要求6所述的驱动方法,其中,连接所述第一薄膜晶体管的所述数据信号线上的数据信号经由所述第一漏极传输至所述第二薄膜晶体管,并由所述第二漏极传输至所述有源发光二极管的所述阴极。
  8. 一种OLED驱动芯片,用于对像素电路进行驱动,其中,包括移位寄存模块、第一级缓存模块、第二级缓存模块以及复用电路选择模块;
    所述移位寄存模块的输入端接入上一级时钟信号,经过一个时钟周期后并向所述第一级缓存模块输出当前级时钟信号;
    所述第一级缓存模块接入RGB数据信号,并根据所述当前级时钟信号获取当前级所述RGB数据信号中的灰阶信号并输出至所述第二级缓存模块;
    所述第二级缓存模块接入触控信号,并根据所述触控信号将存储的所述灰阶信号输出至所述复用电路选择模块;
    所述复用电路选择模块接入电源,且输出端与所述像素电路连接;所述复用电路选择模块根据所述灰阶信号转换成逻辑状态并输出高电平或低电平,用于控制像素单元的显示时间长短以切分出所述像素单元的不同灰阶。
  9. 根据权利要求8所述的OLED驱动芯片,其中,所述像素电路包括数据信号线与栅极信号线,所述复用电路选择模块的输出端与所述数据信号线连接。
  10. 根据权利要求9所述的OLED驱动芯片,其中,所述像素电路还包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容以及有源发光二极管;
    所述第一薄膜晶体管的第一栅极与所述栅极信号线连接,第一源极与所述数据信号线连接,第一漏极分别与所述存储电容的第一电极板以及所述第二薄膜晶体管的第二栅极连接;
    所述第二薄膜晶体管的第二源极与所述复用电路选择模块的输出端连接,第二漏极与所述有源发光二极管的阳极连接;
    所述第三薄膜晶体管的第三栅极与所述栅极信号线连接,第三源极与所述存储电容的第二电极板连接,第三漏极接入参考电压;
    所述有源发光二极管的阴极与所述阳极连接,用于控制所述像素单元的显示。
  11. 根据权利要求10所述的OLED驱动芯片,其中,当所述复用电路选择模块输出高电平时,所述第二薄膜晶体管关闭,所述像素电路处于放电状态,所述有源发光二极管处于暗态。
  12. 根据权利要求11所述的OLED驱动芯片,其中,连接所述第一薄膜晶体管的所述数据信号线上的数据信号经由所述第一漏极通过所述存储电容传输至所述第三薄膜晶体管进行放电。
  13. 根据权利要求10所述的OLED驱动芯片,其中,当所述复用电路选择模块输出低电平时,所述第二薄膜晶体管打开,所述像素电路处于充电状态,所述有源发光二极管导通并处于亮态。
  14. 根据权利要求13所述的OLED驱动芯片,其中,连接所述第一薄膜晶体管的所述数据信号线上的数据信号经由所述第一漏极传输至所述第二薄膜晶体管,并由所述第二漏极传输至所述有源发光二极管的所述阴极。
PCT/CN2019/075565 2018-12-17 2019-02-20 一种oled驱动芯片及其驱动方法 WO2020124768A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811545191.4A CN109410837B (zh) 2018-12-17 2018-12-17 一种oled驱动芯片及其驱动方法
CN201811545191.4 2018-12-17

Publications (1)

Publication Number Publication Date
WO2020124768A1 true WO2020124768A1 (zh) 2020-06-25

Family

ID=65459658

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/075565 WO2020124768A1 (zh) 2018-12-17 2019-02-20 一种oled驱动芯片及其驱动方法

Country Status (2)

Country Link
CN (1) CN109410837B (zh)
WO (1) WO2020124768A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111223443B (zh) * 2020-03-17 2021-02-09 京东方科技集团股份有限公司 像素电路及其驱动方法、显示基板、显示装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040019771A (ko) * 2002-08-29 2004-03-06 오리온전기 주식회사 평판 표시 소자 및 그 구동 방법
CN1809865A (zh) * 2003-04-29 2006-07-26 剑桥显示技术公司 用于无源矩阵显示器的pwm驱动器及其对应的方法
CN101017644A (zh) * 2006-02-10 2007-08-15 奇晶光电股份有限公司 双扫描式显示器的驱动方法及其相关显示装置
US20070263016A1 (en) * 2005-05-25 2007-11-15 Naugler W E Jr Digital drive architecture for flat panel displays
CN103903564A (zh) * 2014-03-19 2014-07-02 京东方科技集团股份有限公司 像素电路及驱动方法、有机发光显示面板和显示装置
CN105185313A (zh) * 2015-10-15 2015-12-23 深圳市华星光电技术有限公司 Amoled驱动方法
US20170116906A1 (en) * 2015-10-27 2017-04-27 National Chiao Tung University Data line driving circuit, data line driver and display device including the same
CN108022551A (zh) * 2016-10-28 2018-05-11 启端光电股份有限公司 微发光二极管显示器的资料驱动器

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100555398C (zh) * 2005-06-30 2009-10-28 精工爱普生株式会社 集成电路装置及电子设备
KR100776488B1 (ko) * 2006-02-09 2007-11-16 삼성에스디아이 주식회사 데이터 구동회로 및 이를 구비한 평판 표시장치
EP2369571B1 (en) * 2007-03-08 2013-04-03 Sharp Kabushiki Kaisha Display device and its driving method
JP6462207B2 (ja) * 2013-11-21 2019-01-30 ラピスセミコンダクタ株式会社 表示デバイスの駆動装置
CN103794179B (zh) * 2014-03-06 2016-03-02 四川虹视显示技术有限公司 一种oled驱动方法及装置
CN104916253A (zh) * 2014-03-12 2015-09-16 晶田科技有限公司 用于驱动发光元件的驱动器与驱动方法及显示器
KR102254762B1 (ko) * 2014-08-01 2021-05-25 삼성디스플레이 주식회사 표시장치
KR102509240B1 (ko) * 2015-11-30 2023-03-13 엘지디스플레이 주식회사 표시장치
KR102555060B1 (ko) * 2016-09-30 2023-07-17 엘지디스플레이 주식회사 액정표시장치와 그 구동 방법
CN106683616A (zh) * 2017-02-09 2017-05-17 信利(惠州)智能显示有限公司 有源矩阵有机发光显示装置
CN107068104A (zh) * 2017-06-14 2017-08-18 深圳市华星光电技术有限公司 补偿显示器色偏的系统和方法
CN108682399B (zh) * 2018-05-21 2020-03-06 京东方科技集团股份有限公司 显示装置、像素驱动电路及其驱动方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040019771A (ko) * 2002-08-29 2004-03-06 오리온전기 주식회사 평판 표시 소자 및 그 구동 방법
CN1809865A (zh) * 2003-04-29 2006-07-26 剑桥显示技术公司 用于无源矩阵显示器的pwm驱动器及其对应的方法
US20070263016A1 (en) * 2005-05-25 2007-11-15 Naugler W E Jr Digital drive architecture for flat panel displays
CN101017644A (zh) * 2006-02-10 2007-08-15 奇晶光电股份有限公司 双扫描式显示器的驱动方法及其相关显示装置
CN103903564A (zh) * 2014-03-19 2014-07-02 京东方科技集团股份有限公司 像素电路及驱动方法、有机发光显示面板和显示装置
CN105185313A (zh) * 2015-10-15 2015-12-23 深圳市华星光电技术有限公司 Amoled驱动方法
US20170116906A1 (en) * 2015-10-27 2017-04-27 National Chiao Tung University Data line driving circuit, data line driver and display device including the same
CN108022551A (zh) * 2016-10-28 2018-05-11 启端光电股份有限公司 微发光二极管显示器的资料驱动器

Also Published As

Publication number Publication date
CN109410837A (zh) 2019-03-01
CN109410837B (zh) 2020-12-04

Similar Documents

Publication Publication Date Title
CN105931599B (zh) 像素驱动电路及其驱动方法、显示面板、显示装置
TWI404036B (zh) 液晶顯示器
US8687025B2 (en) Display device and driving method thereof
US10545607B2 (en) Pixel circuit and driving method, display panel and display apparatus
CN104700783B (zh) 像素驱动电路的驱动方法
WO2016187990A1 (zh) 像素电路以及像素电路的驱动方法
WO2022226951A1 (zh) 像素电路及其驱动方法、显示装置
CN114758619A (zh) 一种像素电路及其驱动方法、显示面板及显示装置
US10714002B2 (en) Pixel circuit and driving method thereof, display panel and display device
US9972245B2 (en) Pixel circuit, driving method for the pixel circuit, display panel, and display device
US9437142B2 (en) Pixel circuit and display apparatus
WO2021092990A1 (zh) 像素驱动电路和显示面板
CN104299573A (zh) 一种像素电路、显示面板及其驱动方法
WO2023035321A1 (zh) 像素电路及显示面板
US20230178011A1 (en) Display panel and display device
WO2023115533A1 (zh) 像素电路以及显示面板
WO2021077487A1 (zh) 像素单元及显示面板
US9159268B2 (en) Organic light emitting diode display and its driving method
US10510297B2 (en) Pixel circuit, driving method thereof, display panel and display device
CN110706641B (zh) 像素驱动电路及显示装置
WO2021120290A1 (zh) 一种像素电路及其驱动方法、显示面板
WO2020124768A1 (zh) 一种oled驱动芯片及其驱动方法
JP6539637B2 (ja) 有機発光ディスプレイ装置のエミッション信号制御回路及びエミッション信号制御方法、並びに有機発光ディスプレイ装置
CN203085137U (zh) 一种像素电路、有机电致发光显示面板及显示装置
WO2020006854A1 (zh) 一种像素驱动电路及显示面板

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19900689

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19900689

Country of ref document: EP

Kind code of ref document: A1