公开(公告)号：US5311169A

公开(公告)日：1994-05-10

申请号：US735763

申请日：1991-07-26

申请人： Shuji Inada ,  Ikuo Ogawa ,  Toshihiro Ohba ,  Hiroshi Kishishita ,  Hisashi Uede

发明人： Shuji Inada ,  Ikuo Ogawa ,  Toshihiro Ohba ,  Hiroshi Kishishita ,  Hisashi Uede

IPC分类号： G09G3/20 ,  G09G3/30 ,  H04N3/12 ,  H04N3/14 ,  C09G3/30

CPC分类号： H04N3/127 ,  G09G3/2014 ,  G09G3/30 ,  H04N3/14 ,  G09G2310/027 ,  G09G2310/066 ,  G09G2320/0223 ,  G09G3/2011

摘要： This invention relates to gradation display by a pulse width control method (PWM method) in every pixel in a capacitive display apparatus such as a liquid crystal display apparatus. The driving voltage applied to the electrodes is varied slowly, and the number of gradations of gradation display by the PWM method is increased. Since the capacitive display apparatus is used, for each electrode further from the drive circuit, the driving pulse is more influenced and its persisting duration is extended. As a result, even in identical gradation data, uneven colors may occur. The pulse width applied to the electrodes is gradually decreased as scanning of the electrodes sequentially occurs. Therefore, the brightness of the capacitive display apparatus may be made uniform over the entire screen surface.

摘要翻译： 本发明涉及通过液晶显示装置等电容显示装置的各像素中的脉冲宽度控制方法（PWM方式）进行灰度显示。 施加到电极的驱动电压变化缓慢，并且通过PWM方法的灰度显示的灰度级数增加。 由于使用了电容显示装置，所以对驱动电路进一步的每个电极，驱动脉冲的影响更大，持续时间延长。 结果，即使在相同的灰度数据中，也可能发生不均匀的颜色。 随着电极的扫描依次发生，施加到电极的脉冲宽度逐渐减小。 因此，电容显示装置的亮度可以在整个屏幕表面上均匀。

公开(公告)号：US07212179B2

公开(公告)日：2007-05-01

申请号：US11208547

申请日：2005-08-23

申请人： Shuichi Seki

发明人： Shuichi Seki

IPC分类号： C09G3/30 ,  C09G3/10

CPC分类号： G09G3/3233 ,  G09G3/2022 ,  G09G2300/043 ,  G09G2300/0819 ,  G09G2300/0852 ,  G09G2300/0861 ,  G09G2320/0233

摘要： A correction voltage retaining capacitor C2, a correction voltage write transistor Tr4, and a switching transistor Tr5 are added to a pixel structure of an SES drive method provided with an organic EL element E1 as a light emitting element, a light emission drive transistor Tr1, a data write transistor Tr2, and an erase transistor Tr3 which can erase electrical charges in a light emission maintaining capacitor C1. With the ON operation of the erase transistor Tr3, the correction voltage write transistor Tr4 is turned on, and the switching transistor Tr5 is turned off. In this state, the threshold voltage (Vth) of the light emission drive transistor Tr1 is written in the correction voltage retaining capacitor C2. When pixels are lit, by a gate-to-source voltage obtained by adding the threshold voltage written in the correction voltage retaining capacitor C2 to a data voltage written in the light emission maintaining capacitor C1, drain current of the light emission drive transistor Tr1 flows. Thus, among respective pixels, a lighting operation is performed in a state in which variations of light emission intensities caused by variations of threshold voltages of the light emission drive transistor Tr1 are restrained.

摘要翻译： 校正电压保持电容器C 2，校正电压写入晶体管Tr 4和开关晶体管Tr 5被添加到设置有有机EL元件E 1作为发光元件的SES驱动方法的像素结构中，发光 驱动晶体管Tr 1，数据写入晶体管Tr 2和擦除晶体管Tr 3，其可以擦除发光维持电容器C1中的电荷。 通过擦除晶体管Tr 3的导通操作，校正电压写入晶体管Tr 4导通，开关晶体管Tr 5截止。 在这种状态下，发光驱动晶体管Tr1的阈值电压（Vth）被写入校正保持电容器C2。 当像素点亮时，通过将写入校正保持电容器C 2中的阈值电压加到写入发光维持电容器C1的数据电压而获得的栅极到源极电压，发光驱动晶体管的漏极电流 Tr 1流。 因此，在各像素中，在抑制由发光驱动晶体管Tr 1的阈值电压的变化引起的发光强度的变化的状态下进行点亮动作。