技术领域technical field
本发明涉及OLED显示技术领域，具体地指一种OLED面板驱动电路、驱动方法及显示装置。The present invention relates to the technical field of OLED display, in particular to an OLED panel driving circuit, a driving method and a display device.
背景技术Background technique
OLED面板(有机电致发光显示器)作为继TFT-LCD(液晶显示器)之后的第三代显示器，与TFT-LCD相比，具有响应速度快、高亮度、高对比度、超轻超薄、低功耗、无视角限制、工作温度范围宽、抗震性能好、可实现柔软显示等优点，可以预见在不久的将来OLED面板将会成为通用性的显示设备走进千家万户。OLED panel (organic electroluminescence display) is the third generation display after TFT-LCD (liquid crystal display). Compared with TFT-LCD, it has fast response, high brightness, high contrast, ultra-light Power consumption, no viewing angle limitation, wide operating temperature range, good shock resistance, flexible display and other advantages, it can be predicted that in the near future OLED panels will become a universal display device and enter thousands of households.
经过多年的研究与发展，OLED在显示领域逐渐得到了广泛的应用，但是OLED还存在着一些如寿命、显示均匀性等亟待解决的难题。近年来，有研究指出混合采用恒压源和占空比及频率可调的脉冲电源来驱动OLED以提高OLED的使用寿命，也有本领域技术人员提出一些在OLED像素驱动电路中增加晶体管和电容的补偿电路来改善OLED的显示缺陷，但这些方法只能改善OLED的单一缺陷，而且极大的增加了OLED面板的成本、体积或牺牲了OLED的像素开口率，严重制约着OLED的发展。After years of research and development, OLEDs have gradually been widely used in the display field, but there are still some problems that need to be solved urgently in OLEDs, such as lifespan and display uniformity. In recent years, some studies have pointed out that a constant voltage source and a pulse power supply with adjustable duty cycle and frequency are used to drive OLEDs to improve the service life of OLEDs, and some skilled in the art have proposed some methods of adding transistors and capacitors to OLED pixel drive circuits. Compensation circuits are used to improve the display defects of OLEDs, but these methods can only improve a single defect of OLEDs, and greatly increase the cost and volume of OLED panels or sacrifice the pixel aperture ratio of OLEDs, seriously restricting the development of OLEDs.
发明内容Contents of the invention
针对现有技术的不足，本发明的目的在于提供一种OLED面板驱动电路、驱动方法及显示装置，在不增加OLED面板的成本、体积或牺牲OLED像素开口率的前提下，能同时改善OLED面板的寿命和显示质量。Aiming at the deficiencies of the prior art, the object of the present invention is to provide an OLED panel driving circuit, a driving method and a display device, which can simultaneously improve the OLED panel without increasing the cost and volume of the OLED panel or sacrificing the OLED pixel aperture ratio. life and display quality.
为实现上述目的，本发明所设计的一种OLED面板驱动电路，包括第一晶体管、信号储存电容和第二晶体管，所述第一晶体管的栅极与扫描信号电连接，所述第一晶体管的第二电极与数据信号电连接，所述第一晶体管的第三电极分别与信号储存电容和第二晶体管的栅极电连接；所述信号储存电容的另一端接地；所述第二晶体管的第二电极与OLED发光单元的阴极电连接，其还包括电源管理模块和恒流镜驱动模块；所述电源管理模块的输出端分别与OLED发光单元的阳极和恒流镜驱动模块的输入端电连接，所述电源管理模块用于同时为OLED发光单元和恒流镜驱动模块提供脉冲电源；所述恒流镜驱动模块的输出端与第二晶体管的第三电极电连接，所述恒流镜驱动模块用于为OLED发光单元提供驱动恒流。In order to achieve the above object, an OLED panel driving circuit designed by the present invention includes a first transistor, a signal storage capacitor and a second transistor, the gate of the first transistor is electrically connected to the scanning signal, and the gate of the first transistor is electrically connected to the scanning signal. The second electrode is electrically connected to the data signal, the third electrode of the first transistor is electrically connected to the signal storage capacitor and the gate of the second transistor respectively; the other end of the signal storage capacitor is grounded; The two electrodes are electrically connected to the cathode of the OLED light-emitting unit, which also includes a power management module and a constant current mirror drive module; the output terminals of the power management module are respectively electrically connected to the anode of the OLED light-emitting unit and the input end of the constant current mirror drive module , the power management module is used to simultaneously provide pulse power for the OLED light-emitting unit and the constant current mirror drive module; the output terminal of the constant current mirror drive module is electrically connected to the third electrode of the second transistor, and the constant current mirror drive The module is used to provide driving constant current for the OLED light emitting unit.
进一步地，所述恒流镜驱动模块包括运算放大器、快速二极管、NMOS管和恒流电阻，所述运算放大器的同向输入端与电源管理模块的输出端电连接，所述NMOS管的漏极与第二晶体管的第三电极电连接，所述NMOS管的栅极与快速二极管的阳极电连接，所述快速二极管的阴极与运算放大器的输出端电连接，所述NMOS管的源极经恒流电阻接地，所述恒流电阻与NMOS管的源极相连的一端与运算放大器的反向输入端电连接。Further, the constant current mirror driving module includes an operational amplifier, a fast diode, an NMOS transistor and a constant current resistor, the same input terminal of the operational amplifier is electrically connected to the output terminal of the power management module, and the drain of the NMOS transistor It is electrically connected to the third electrode of the second transistor, the gate of the NMOS transistor is electrically connected to the anode of the fast diode, the cathode of the fast diode is electrically connected to the output terminal of the operational amplifier, and the source of the NMOS transistor is constant The current resistance is grounded, and the end of the constant current resistance connected to the source of the NMOS transistor is electrically connected to the inverting input end of the operational amplifier.
更进一步地，所述OLED面板驱动电路包括n个像素驱动支路，每个所述像素驱动支路包括所述第一晶体管、信号储存电容、第二晶体管和OLED发光单元，所述恒流镜驱动模块包括n个NMOS管，每个所述NMOS管的漏极分别与一个像素驱动支路的第二晶体管的第三电极电连接，每个所述NMOS管的栅极相互连接，每个所述NMOS管的源极相互连接。Furthermore, the OLED panel driving circuit includes n pixel driving branches, each of which includes the first transistor, a signal storage capacitor, a second transistor and an OLED light emitting unit, and the constant current mirror The driving module includes n NMOS transistors, the drains of each of the NMOS transistors are electrically connected to the third electrode of the second transistor of a pixel driving branch, the gates of each of the NMOS transistors are connected to each other, and each of the NMOS transistors The sources of the NMOS transistors are connected to each other.
更进一步地，所述电源管理模块的输出端与所述第二晶体管的第二电极电连接，所述第二晶体管的第三电极与OLED发光单元的阳极电连接，所述OLED发光单元的阴极与NMOS管的漏极电连接。Furthermore, the output end of the power management module is electrically connected to the second electrode of the second transistor, the third electrode of the second transistor is electrically connected to the anode of the OLED light-emitting unit, and the cathode of the OLED light-emitting unit It is electrically connected with the drain of the NMOS transistor.
更进一步地，所述电源管理模块输出的脉冲电源为正负脉冲电压，所述正脉冲电压的占空比为90％-95％，所述负脉冲电压的占空比为10％-5％。Furthermore, the pulse power output by the power management module is a positive and negative pulse voltage, the duty cycle of the positive pulse voltage is 90%-95%, and the duty cycle of the negative pulse voltage is 10%-5%. .
一种显示装置，包括上面所述的OLED面板驱动电路。A display device includes the above-mentioned OLED panel drive circuit.
另外，提供一种OLED面板驱动电路的驱动方法，其特殊之处在于，包括如下步骤：In addition, a driving method of an OLED panel driving circuit is provided, which is special in that it includes the following steps:
1)电源管理模块分别向OLED发光单元的阳极和恒流镜驱动模块的输入端输出脉冲电源；1) The power management module outputs pulse power to the anode of the OLED light-emitting unit and the input end of the constant current mirror drive module respectively;
2)向每个像素驱动支路发送数据信号(Vdata)和扫描信号(Scan)。2) Send a data signal (Vdata) and a scan signal (Scan) to each pixel driving branch.
进一步地，所述步骤一还包括，在电源管理模块输出正脉冲电源时使通过NMOS管的电流保持为设定电流值Ioled，其具体包括：Further, the first step also includes, when the power management module outputs a positive pulse power supply, keeping the current passing through the NMOS tube at a set current value Ioled , which specifically includes:
11)根据设定电流值IOLED计算恒流镜驱动模块的驱动电流值，计算公式为：I＝Ioled*n，其中n等于像素驱动支路的路数；11) Calculate the drive current value of the constant current mirror drive module according to the set current value IOLED , and the calculation formula is: I=IOLED *n, wherein n is equal to the number of channels of the pixel drive branch;
12)根据驱动电流值计算驱动电压值V，计算公式为：V＝I*R，其中R为恒流电阻的阻值；12) Calculate the driving voltage value V according to the driving current value, the calculation formula is: V=I*R, where R is the resistance value of the constant current resistor;
13)电源管理模块向运算放大器的同相输入端输入正脉冲电压值V。13) The power management module inputs a positive pulse voltage value V to the non-inverting input terminal of the operational amplifier.
更进一步地，所述步骤二具体包括：Further, said step two specifically includes:
21)每条支路中的第一晶体管接收到数据信号(Vdata)后根据扫描信号(Scan)对信号储存电容进行充电，同时信号储存电容将数据信号(Vdata)传送至第二晶体管；21) After receiving the data signal (Vdata), the first transistor in each branch charges the signal storage capacitor according to the scan signal (Scan), and at the same time, the signal storage capacitor transmits the data signal (Vdata) to the second transistor;
22)每条支路中的第二晶体管根据数据信号(Vdata)将支路中的OLED发光单元与对应的NMOS管连通，则通过OLED发光单元的电流值等于通过NMOS管的电流值，即设定电流值Ioled。22) The second transistor in each branch connects the OLED light-emitting unit in the branch with the corresponding NMOS tube according to the data signal (Vdata), then the current value passing through the OLED light-emitting unit is equal to the current value passing through the NMOS tube, that is, set Constant current value Ioled .
本发明的工作原理是：The working principle of the present invention is:
当电源管理模块输出正脉冲电源时，恒流镜驱动模块为OLED发光单元提供驱动恒流，流过OLED发光单元的电流恒等于通过NMOS管的电流值Ioled，从而改善OLED面板显示亮度不均匀的缺陷；当电源管理模块输出负脉冲电源时，快速二极管会截断恒流镜驱动模块与OLED发光单元的连接，此时OLED发光单元两端的电压为反向恒压，短暂的反向偏压有益于移除电荷陷阱并阻止杂质离子向电极漂移，从而提高OLED面板的寿命。When the power management module outputs a positive pulse power supply, the constant current mirror drive module provides a driving constant current for the OLED light-emitting unit, and the current flowing through the OLED light-emitting unit is equal to the current value Ioled passing through the NMOS tube, thereby improving the uneven display brightness of the OLED panel defects; when the power management module outputs a negative pulse power supply, the fast diode will cut off the connection between the constant current mirror drive module and the OLED light emitting unit. At this time, the voltage at both ends of the OLED light emitting unit is a reverse constant voltage, and a short reverse bias is beneficial It is used to remove charge traps and prevent impurity ions from drifting to the electrodes, thus improving the lifetime of OLED panels.
其中，恒流镜驱动模块提供的驱动恒流可以由下式确定：Among them, the driving constant current provided by the constant current mirror driving module can be determined by the following formula:
则流过像素驱动支路OLED发光单元的电流可以由下式确定：Then the current flowing through the OLED light-emitting unit of the pixel driving branch can be determined by the following formula:
因此通过改变电源管理模块输出正脉冲电源的幅值即驱动电压值V就可以改变通过OLED发光单元的电流大小和灰度等级。Therefore, by changing the amplitude of the positive pulse power output by the power management module, that is, the driving voltage value V, the magnitude of the current passing through the OLED light-emitting unit and the gray scale can be changed.
本发明较现有技术的有益之处在于：利用电源管理模块同时为OLED发光单元和恒流镜驱动模块提供脉冲电源输出，可以在不增加OLED面板的成本、体积或牺牲OLED像素开口率的前提下，能同时改善OLED面板的寿命和显示质量，并且OLED的显示亮度可以调节。Compared with the prior art, the present invention is beneficial in that: the use of the power management module simultaneously provides pulse power output for the OLED light-emitting unit and the constant current mirror drive module, without increasing the cost and volume of the OLED panel or sacrificing the OLED pixel aperture ratio. In this way, the lifespan and display quality of the OLED panel can be improved at the same time, and the display brightness of the OLED can be adjusted.
附图说明Description of drawings
图1为本发明OLED面板驱动电路的结构图；Fig. 1 is the structural diagram of OLED panel drive circuit of the present invention;
图2为本发明OLED面板驱动电路实施例的结构示意图；2 is a schematic structural view of an embodiment of an OLED panel drive circuit of the present invention;
图3为本发明OLED面板驱动方法的流程图；Fig. 3 is the flowchart of OLED panel driving method of the present invention;
图中：1.电源管理模块，2.恒流镜驱动模块，2-1.运算放大器，2-2.快速二极管，2-3.NMOS管，2-4.恒流电阻，3.OLED发光单元。In the figure: 1. Power management module, 2. Constant current mirror driver module, 2-1. Operational amplifier, 2-2. Fast diode, 2-3. NMOS tube, 2-4. Constant current resistor, 3. OLED light emitting unit.
具体实施方式Detailed ways
以下结合附图和具体实施例对本发明作进一步的详细描述。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
如图1所示，本发明所提供的OLED面板驱动电路，包括第一晶体管、信号储存电容、第二晶体管、电源管理模块(1)、恒流镜驱动模块(2)和OLED发光单元(3)，第一晶体管的栅极与扫描信号电连接，第二电极与数据信号电连接，第三电极分别与信号储存电容和第二晶体管的栅极电连接；信号储存电容的另一端接地；第二晶体管的第二电极与OLED发光单元(3)的阴极电连接；电源管理模块(1)的输出端分别与OLED发光单元(3)的阳极和恒流镜驱动模块(2)的输入端电连接；恒流镜驱动模块(2)的输出端与第二晶体管的第三电极电连接。As shown in Figure 1, the OLED panel driving circuit provided by the present invention includes a first transistor, a signal storage capacitor, a second transistor, a power management module (1), a constant current mirror driving module (2) and an OLED light emitting unit (3 ), the gate of the first transistor is electrically connected to the scanning signal, the second electrode is electrically connected to the data signal, and the third electrode is respectively electrically connected to the signal storage capacitor and the gate of the second transistor; the other end of the signal storage capacitor is grounded; the second The second electrode of the two transistors is electrically connected to the cathode of the OLED light-emitting unit (3); the output terminal of the power management module (1) is electrically connected to the anode of the OLED light-emitting unit (3) and the input terminal of the constant current mirror drive module (2) respectively. connection; the output terminal of the constant current mirror driving module (2) is electrically connected with the third electrode of the second transistor.
其中恒流镜驱动模块(2)包括运算放大器(2-1)、快速二极管(2-2)、NMOS管(2-3)和恒流电阻(2-4)，运算放大器(2-1)的同向输入端与电源管理模块(1)的输出端电连接，NMOS管(2-3)的漏极与第二晶体管的第三电极电连接，栅极与快速二极管(2-2)的阳极电连接，快速二极管(2-2)的阴极与运算放大器(2-1)的输出端电连接，NMOS管(2-3)的源极经恒流电阻(2-4)接地，恒流电阻(2-4)与NMOS管(2-3)的源极相连的一端与运算放大器(2-1)的反向输入端电连接。Wherein the constant current mirror driving module (2) includes an operational amplifier (2-1), a fast diode (2-2), an NMOS tube (2-3) and a constant current resistor (2-4), and an operational amplifier (2-1) The same input end of the NMOS transistor (2-3) is electrically connected to the output end of the power management module (1), the drain of the NMOS transistor (2-3) is electrically connected to the third electrode of the second transistor, and the gate is connected to the fast diode (2-2) The anode is electrically connected, the cathode of the fast diode (2-2) is electrically connected to the output terminal of the operational amplifier (2-1), the source of the NMOS tube (2-3) is grounded through the constant current resistor (2-4), and the constant current One end of the resistor (2-4) connected to the source of the NMOS transistor (2-3) is electrically connected to the inverting input end of the operational amplifier (2-1).
本发明OLED面板驱动电路的实施例如图2所示，驱动电路包括n个像素驱动支路，每个像素驱动支路包括一个第一晶体管、一个信号储存电容、一个第二晶体管和一个OLED发光单元(3)，恒流镜驱动模块(2)包括n个NMOS管(2-3)，每个NMOS管(2-3)的漏极分别与一个像素驱动支路的第二晶体管的第三电极电连接，每个NMOS管(2-3)的栅极相互连接，每个NMOS管(2-3)的源极相互连接。An embodiment of the OLED panel driving circuit of the present invention is shown in FIG. 2. The driving circuit includes n pixel driving branches, and each pixel driving branch includes a first transistor, a signal storage capacitor, a second transistor and an OLED light emitting unit. (3), the constant current mirror driving module (2) comprises n NMOS transistors (2-3), the drain of each NMOS transistor (2-3) is connected with the third electrode of the second transistor of a pixel driving branch respectively Electrically connected, the gates of each NMOS transistor (2-3) are connected to each other, and the sources of each NMOS transistor (2-3) are connected to each other.
如图3所示，上述OLED面板驱动电路的驱动方法，包括如下步骤：As shown in FIG. 3, the driving method of the OLED panel driving circuit includes the following steps:
1)电源管理模块(1)分别向OLED发光单元(3)的阳极和恒流镜驱动模块(2)的输入端输出脉冲电源；1) The power management module (1) outputs pulse power to the anode of the OLED light emitting unit (3) and the input end of the constant current mirror drive module (2);
11)根据需要流过OLED发光单元(3)的电流值IOLED计算恒流镜驱动模块(2)的驱动电流值I，计算公式为：I＝Ioled*n，其中n等于像素驱动支路的路数；11) Calculate the driving current value I of the constant current mirror drive module (2) according to the current value IOLED flowing through the OLED light-emitting unit (3), and the calculation formula is: I=Ioled *n, wherein n is equal to the pixel driving branch the number of roads;
12)根据驱动电流值I计算电源管理模块(1)的正脉冲电压V，计算公式为：V＝I*R，其中R为所述恒流电阻(2-4)的阻值；12) Calculate the positive pulse voltage V of the power management module (1) according to the driving current value I, and the calculation formula is: V=I*R, where R is the resistance value of the constant current resistor (2-4);
13)电源管理模块(1)向运算放大器(2-1)的同相输入端输入正脉冲电压值V；13) The power management module (1) inputs the positive pulse voltage value V to the non-inverting input terminal of the operational amplifier (2-1);
2)向每个像素驱动支路发送数据信号(Vdata)和扫描信号(Scan)；2) Send a data signal (Vdata) and a scanning signal (Scan) to each pixel driving branch;
21)每条支路中的第一晶体管接收到数据信号(Vdata)后根据扫描信号(Scan)对信号储存电容进行充电，同时信号储存电容将数据信号(Vdata)传送至第二晶体管；21) After receiving the data signal (Vdata), the first transistor in each branch charges the signal storage capacitor according to the scan signal (Scan), and at the same time, the signal storage capacitor transmits the data signal (Vdata) to the second transistor;
22)每条支路中的第二晶体管根据数据信号(Vdata)将支路中的OLED发光单元(3)与对应的NMOS管(2-3)连通，则通过OLED发光单元(3)的电流值等于通过NMOS管(2-3)的电流值。22) The second transistor in each branch connects the OLED light-emitting unit (3) in the branch with the corresponding NMOS transistor (2-3) according to the data signal (Vdata), and the current passing through the OLED light-emitting unit (3) The value is equal to the current value passing through the NMOS transistor (2-3).
恒流镜驱动模块(2)与各像素驱动支路的电流镜结构方式，使得电源管理模块(1)输出正脉冲电压时流过各像素驱动电路OLED发光单元(3)的电流Ioled始终保持一致，所以能保证各像素发光亮度均匀。The current mirror structure mode of the constant current mirror driving module (2) and each pixel driving branch circuit makes the current Ioled flowing through each pixel driving circuit OLED light emitting unit (3) always maintain when the power management module (1) outputs a positive pulse voltage. Consistent, so it can ensure that the brightness of each pixel is uniform.
流过OLED发光单元(3)的电流Ioled可根据The current Ioled flowing through the OLED light-emitting unit (3) can be based on
计算得到，流过各像素驱动支路的电流只与运算放大器(2-1)的同相输入端电压、恒流电阻(2-4)的阻值以及像素驱动支路的路数有关，与TFT的个体特性差异以及OLED器件老化而产生的阈值电压漂移等均无关，OLED面板显示画面的灰度等级可以通过改变电源管理模块(1)输出电压的幅度而改变。It is calculated that the current flowing through each pixel driving branch is only related to the voltage of the non-inverting input terminal of the operational amplifier (2-1), the resistance value of the constant current resistor (2-4) and the number of pixel driving branches, and is related to the TFT The individual characteristic difference of the OLED device and the threshold voltage drift caused by the aging of the OLED device are irrelevant, and the gray scale of the display screen of the OLED panel can be changed by changing the amplitude of the output voltage of the power management module (1).
如图2所示，电源管理模块(1)同时向运算放大器(2-1)的同相输入端和所有像素驱动支路中OLED发光单元(3)的阳极提供正负脉冲电压。当电源管理模块(1)输出正脉冲电源时，恒流镜驱动模块(2)为OLED发光单元(3)提供驱动恒流，流过OLED发光单元(3)的电流恒等于通过NMOS管(2-3)的电流值Ioled，使得所有像素驱动支路中OLED发光单元(3)发出相同亮度的光；当电源管理模块(1)输出负脉冲电源时，快速二极管(2-2)处于反向截止状态从而截断恒流镜驱动模块(2)与OLED发光单元(3)的连接，此时OLED发光单元(3)的阳极为负脉冲电压，OLED发光单元(3)的阴极为对地零电压。本实施例中电源管理模块(1)输出的脉冲电源为正负脉冲电压，正脉冲电压的占空比为90％-95％，负脉冲电压的占空比为10％-5％。以上仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以设计出若干改进，这些改进也应视为本发明的保护范围。As shown in Fig. 2, the power management module (1) simultaneously provides positive and negative pulse voltages to the non-inverting input terminal of the operational amplifier (2-1) and the anodes of the OLED light-emitting units (3) in all pixel drive branches. When the power management module (1) outputs a positive pulse power supply, the constant current mirror drive module (2) provides a driving constant current for the OLED light emitting unit (3), and the current flowing through the OLED light emitting unit (3) is equal to the current passing through the NMOS tube (2 -3) the current value Ioled , so that the OLED light-emitting units (3) in all pixel drive branches emit light with the same brightness; when the power management module (1) outputs a negative pulse power supply, the fast diode (2-2) is in reverse To the cut-off state, the connection between the constant current mirror drive module (2) and the OLED light-emitting unit (3) is cut off. At this time, the anode of the OLED light-emitting unit (3) is a negative pulse voltage, and the cathode of the OLED light-emitting unit (3) is zero to ground. Voltage. In this embodiment, the pulse power output by the power management module (1) is positive and negative pulse voltage, the duty cycle of the positive pulse voltage is 90%-95%, and the duty cycle of the negative pulse voltage is 10%-5%. The above are only preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements can also be designed without departing from the principles of the present invention, and these improvements should also be regarded as the invention. protected range.
| Application Number | Priority Date | Filing Date | Title |
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| CN201510222515.0ACN104882094A (en) | 2015-04-30 | 2015-04-30 | OLED panel drive circuit, drive method and display device |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510222515.0ACN104882094A (en) | 2015-04-30 | 2015-04-30 | OLED panel drive circuit, drive method and display device |
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| CN104882094Atrue CN104882094A (en) | 2015-09-02 |
| Application Number | Title | Priority Date | Filing Date |
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| CN201510222515.0APendingCN104882094A (en) | 2015-04-30 | 2015-04-30 | OLED panel drive circuit, drive method and display device |
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| CB02 | Change of applicant information | Address after:430070 Hubei City, Hongshan Province, South Lake Road, No. 53, Hongshan Venture Center, building on the 4 floor, No. Applicant after:Wuhan fine test electronics group Limited by Share Ltd Applicant after:Wuhan University of Technology Address before:430070 Hubei City, Hongshan Province, South Lake Road, No. 53, Hongshan Venture Center, building on the 4 floor, No. Applicant before:Wuhan Jingce Electronic Technology Co., Ltd. Applicant before:Wuhan University of Technology | |
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