公开(公告)号：US20160063913A1

公开(公告)日：2016-03-03

申请号：US14939479

申请日：2015-11-12

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Keisuke MIYAGAWA ,  Hajime KIMURA

IPC: G09G3/20 ,  H01L27/12

CPC classification number: G09G3/2092 ,  G09G3/2029 ,  G09G3/3233 ,  G09G2300/0465 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2320/0233 ,  G09G2320/043 ,  G09G2320/0673 ,  G09G2330/02 ,  H01L27/1222 ,  H01L27/124 ,  H01L27/1255

Abstract: The inventors found out that in the case of performing a low gray scale display in which a very small amount of current is supplied to a light emitting element, variations in threshold voltages of driving transistors become notable since the gate-source voltage is low. In view of this, the invention provides a display device in which variations in the threshold voltages of the driving transistors are reduced even in the low gray scale display, and a driving method thereof. According to the invention, a gate-source voltage of the driving transistor is set higher in the low gray scale display than that in the high gray scale display. As one mode to achieve this, different power source lines are provided for the low gray scale display and the high gray scale display and their potentials are set to be different.

Abstract translation: 本发明人发现，在执行向发光元件供应非常少量的电流的低灰度显示的情况下，由于栅极 - 源极电压低，所以驱动晶体管的阈值电压的变化变得显着。 鉴于此，本发明提供一种即使在低灰度级显示器中驱动晶体管的阈值电压的变化也减小的显示装置及其驱动方法。 根据本发明，驱动晶体管的栅极 - 源极电压在低灰度显示器中比在高灰度级显示器中高。 作为实现这一点的一种模式，为低灰度显示和高灰度显示提供不同的电源线，并且它们的电位被设置为不同。

公开(公告)号：US20170011686A1

公开(公告)日：2017-01-12

申请号：US15271578

申请日：2016-09-21

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Mitsuaki Osame ,  Aya ANZAI ,  Yoshifumi TANADA ,  Keisuke MIYAGAWA ,  Satoshi SEO ,  Shunpei YAMAZAKI

IPC: G09G3/3233 ,  G09G3/3266

CPC classification number: G09G3/32 ,  G09G3/3233 ,  G09G3/3258 ,  G09G3/3266 ,  G09G3/3291 ,  G09G2300/043 ,  G09G2300/0819 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2310/0251 ,  G09G2310/0256 ,  G09G2310/027 ,  G09G2310/061 ,  G09G2310/08 ,  G09G2320/043 ,  G09G2320/045 ,  H01L33/0041

Abstract: A light emitting device that achieves long life, and which is capable of performing high duty drive, by suppressing initial light emitting element deterioration is provided. Reverse bias application to an EL element (109) is performed one row at a time by forming a reverse bias electric power source line (112) and a reverse bias TFT (108). Reverse bias application can therefore be performed in synchronous with operations for write-in of an image signal, light emission, erasure, and the like. Reverse bias application therefore becomes possible while maintaining a duty equivalent to that of a conventional driving method.

Abstract translation: 提供了通过抑制初始发光元件劣化而实现长寿命并能够进行高占空比驱动的发光器件。 通过形成反向偏置电源线（112）和反向偏压TFT（108），一次对一个EL元件（109）施加反向偏置。 因此，可以与图像信号的写入，发光，擦除等的操作同步地执行反向偏置应用。 因此，在保持与常规驱动方法相同的占空比的情况下，可以实现反向偏置应用。

公开(公告)号：US20140231808A1

公开(公告)日：2014-08-21

申请号：US14263041

申请日：2014-04-28

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Keisuke MIYAGAWA ,  Hajime KIMURA

IPC: H01L27/12

CPC classification number: G09G3/2092 ,  G09G3/2029 ,  G09G3/3233 ,  G09G2300/0465 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2320/0233 ,  G09G2320/043 ,  G09G2320/0673 ,  G09G2330/02 ,  H01L27/1222 ,  H01L27/124 ,  H01L27/1255

Abstract: The inventors found out that in the case of performing a low gray scale display in which a very small amount of current is supplied to a light emitting element, variations in threshold voltages of driving transistors become notable since the gate-source voltage is low. In view of this, the invention provides a display device in which variations in the threshold voltages of the driving transistors are reduced even in the low gray scale display, and a driving method thereof. According to the invention, a gate-source voltage of the driving transistor is set higher in the low gray scale display than that in the high gray scale display. As one mode to achieve this, different power source lines are provided for the low gray scale display and the high gray scale display and their potentials are set to be different.

Abstract translation: 本发明人发现，在执行向发光元件供应非常少量的电流的低灰度显示的情况下，由于栅极 - 源极电压低，所以驱动晶体管的阈值电压的变化变得显着。 鉴于此，本发明提供一种即使在低灰度级显示器中驱动晶体管的阈值电压的变化也减小的显示装置及其驱动方法。 根据本发明，驱动晶体管的栅极 - 源极电压在低灰度显示器中比在高灰度级显示器中高。 作为实现这一点的一种模式，为低灰度显示和高灰度显示提供不同的电源线，并且它们的电位被设置为不同。