公开(公告)号：US5140175A

公开(公告)日：1992-08-18

申请号：US651364

申请日：1991-05-03

申请人： Keiji Yagi ,  Kazuhiro Zenba ,  Yukihiro Sekiguchi ,  Fumio Ishikawa ,  Tetsuo Yamamoto ,  Takayuki Aoki

发明人： Keiji Yagi ,  Kazuhiro Zenba ,  Yukihiro Sekiguchi ,  Fumio Ishikawa ,  Tetsuo Yamamoto ,  Takayuki Aoki

IPC分类号： H01S5/042 ,  H03K17/0412 ,  H03K17/60 ,  H05B33/08

CPC分类号： H05B33/0818 ,  H03K17/04126 ,  H03K17/603 ,  H05B33/0803 ,  H01S5/0428 ,  Y02B20/347

摘要： A light-emitting diode drive circuit of the present invention comprises: a current supply circuit (3) including a first transistor (16), the base of which receives a first drive pulse signal (S3) output from a signal input circuit, and a second transistor (15), the collector of which is connected to a light-emitting diode (2), the emitter of which is connected to a current source (24) together with the emitter of the first transistor (16), and the base of which receives a second drive pulse signal (S2) having a phase opposite to that of the first drive pulse signal (S3); a fall time shortening circuit (6) including a third transistor (13) which is connected in parallel with the light-emitting diode (2) and the base of which receives an input for short-circuiting both terminals of the light-emitting diode (2) during a turn-OFF time; and a rise time shortening circuit (5) including a circuit (4) for generating a peaking current during a turn-ON time of the light-emitting diode (2), and a fourth transistor (14) being connected in series with the third transistor (13) and adding the peaking current to the drive current during the turn-ON time of the light-emitting diode (2), wherein rise and fall times of the light pulse output are shortened to greatly increase a response speed of the light-emitting diode (2) having poor inherent response characteristics, such as a red light-emitting diode having a short wavelength range.

公开(公告)号：US6081248A

公开(公告)日：2000-06-27

申请号：US932184

申请日：1997-09-17

申请人： Masao Hasegawa ,  Yukihiro Sekiguchi ,  Yoshinobu Inoue ,  Yoshimitsu Uzawa ,  Osamu Kawai

发明人： Masao Hasegawa ,  Yukihiro Sekiguchi ,  Yoshinobu Inoue ,  Yoshimitsu Uzawa ,  Osamu Kawai

IPC分类号： G09G3/20 ,  G09F9/30 ,  G09G3/22

CPC分类号： G09G3/22 ,  G09G2300/0443

摘要： A color display device capable of preventing discontinuity of a line in a single-color display by improving a pattern of dividing of a luminous unit. The color display device includes a plurality of picture cells each constituted by a plurality of luminous units emitting lights different in luminous color from each other. Each two luminous units which have a triangular shape formed by dividing a quadrilateral into two along a diagonal line thereof and constitute each of the picture cells each are permitted to emit light of one of luminous colors different from each other. Such construction, even when only one of the two luminous units constituting each of the picture cells is excited for single-color display, permits luminous units of the same color in the picture cells P adjacent to each other in the longitudinal and lateral directions to be observed in a manner to be continuously connected to each other at the apexes opposite to each other.

摘要翻译： 一种能够通过改善发光单元的分割图案来防止单色显示器中的线不连续的彩色显示装置。 彩色显示装置包括多个图像单元，每个图像单元由发光颜色不同的光的多个发光单元构成。 通过沿着其对角线将四边形分成两部分形成三角形状的每个发光单元，构成每个图像单元，每一个均允许发出彼此不同的发光颜色之一的光。 这样的构成即使构成每个图像单元的两个发光单元中的仅一个被激发用于单色显示，也允许沿纵向和横向彼此相邻的图像单元P中的相同颜色的发光单元为 以彼此相对的顶点彼此连续地连接的方式观察。