公开(公告)号：US20040263241A1

公开(公告)日：2004-12-30

申请号：US10874270

申请日：2004-06-24

申请人： NEC Electronics Corporation ,  NEC Corporation

发明人： Katsuyuki Fujikura ,  Katsumi Abe ,  Masamichi Shimoda

IPC分类号： G05F003/02

CPC分类号： G05F3/262

摘要： A current source circuit includes a voltage output section which outputs a voltage signal; a current source section and a conversion section. The current source section has at least one current source block comprising a plurality of current sources, each of which outputs an output current. The conversion section is provided between the voltage output section and the current source section and outputs a reference current to the plurality of current sources of the at least one current source block based on the voltage signal such that the output current from each of the plurality of current sources is set based on the reference current.

摘要翻译： 电流源电路包括：输出电压信号的电压输出部; 电流源部分和转换部分。 电流源部分具有包括多个电流源的至少一个电流源块，每个电流源输出输出电流。 转换部分设置在电压输出部分和电流源部分之间，并且基于电压信号将参考电流输出到至少一个电流源模块的多个电流源，使得来自多个 电流源基于参考电流设置。

公开(公告)号：US20030030603A1

公开(公告)日：2003-02-13

申请号：US10211534

申请日：2002-08-05

申请人： NEC Corporation

发明人： Masamichi Shimoda

IPC分类号： G09G003/30

CPC分类号： G09G3/3233 ,  G09G3/3291 ,  G09G2300/0465 ,  G09G2300/0814 ,  G09G2300/0842 ,  G09G2310/027 ,  G09G2320/0295 ,  G09G2320/043

摘要： A drive circuit drives a display device including a plurality of pixels arranged as a matrix. Luminous elements are provided for the individual pixels. In this circuit, the luminous element and a drive transistor for driving the luminous element in each of the pixels are serially connected between a first power supply and a second power supply. A first switching transistor supplies the gate of the drive transistor with a control signal for controlling the drive transistor. A differential amplifier compares a voltage at a connection point between the luminous element and the drive transistor, and a control voltage which is input in the differential amplifier so as to control the luminance of the pixel, thereby generating a control signal. The control signal is supplied to the gate of the drive transistor via the first switching transistor. A hold capacitor holds a voltage between the gate and the source of the drive transistor. Thus, the drive circuit does not present a luminance unevenness, enables a high gradation display, prevents a decrease of the yield and the aperture ratio, and decreases the price and the power consumption.

摘要翻译： 驱动电路驱动包括排列成矩阵的多个像素的显示装置。 为各个像素提供发光元件。 在该电路中，用于驱动每个像素中的发光元件的发光元件和驱动晶体管串联连接在第一电源和第二电源之间。 第一开关晶体管为驱动晶体管的栅极提供控制驱动晶体管的控制信号。 差分放大器比较发光元件和驱动晶体管之间的连接点处的电压以及输入到差分放大器中的控制电压，以便控制像素的亮度，由此产生控制信号。 控制信号通过第一开关晶体管提供给驱动晶体管的栅极。 保持电容器在驱动晶体管的栅极和源极之间保持电压。 因此，驱动电路不存在亮度不均匀性，能够实现高灰度显示，防止产量和开口率的降低，并且降低了价格和功耗。