Patents Represented by Attorney, Agent or Law Firm Robinson Property Law Office, P.C.
  • Patent number: 6620528
    Abstract: To provide an inexpensive EL display device of high definition. An anode, a light emitting layer, and a cathode are formed on a substrate, and selective doping using at least one selected from the group consisting of an alkali metal element, an alkaline earth metal element and a halogen element is then performed to form at least ones of electron transmitting regions and hole transmitting regions. In such a structure, only a part of the light emitting layer, where at least ones of the electron transmitting regions and the hole transmitting regions are formed, emits light when a given voltage is applied to the light emitting layer, whereby images are displayed as desired.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: September 16, 2003
    Assignee: Semiconductor Energy Laboratory Co., Ltd
    Inventors: Shunpei Yamazaki, Tetsuo Tsutsui, Mayumi Mizukami