Patents Examined by J. E. Guist
  • Patent number: 5239228
    Abstract: A thin-film electroluminescence (EL) device capable of displaying multiple colors has a laminated structure wherein back electrodes in stripes, a lower dielectric layer, a luminescence layer, an upper dielectric layer and transparent electrodes in stripes are sequentially formed on a transparent substrate in this order. The back electrodes intersect the transparent electrodes at right angles, and areas of the device where the back electrodes confront the transparent electrodes form picture elements. This device also has at least first and second color filters. The first and second filters are placed not only in corresponding picture-element areas of the transparent electrodes, but also in non-picture-element areas of the transparent electrodes and an upper dielectric layer such that the first color filter overlaps the second color filter in the non-picture-element areas.
    Type: Grant
    Filed: July 1, 1991
    Date of Patent: August 24, 1993
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kouji Taniguchi, Shigeo Nakajima, Masaru Yoshida