Patents by Inventor Theo Welzen

Theo Welzen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Liquid crystal display panel and display device
    Patent number: 5956110
    Abstract: A liquid crystal display panel comprises first and second substrates each having a transparent electrode and an orientation plane, a nematic liquid crystal material disposed between the first and second substrates, a polarizer disposed over the first substrate and the nematic liquid crystal material, and a simplex polymer film comprised of a single optically anisotropic substance disposed between the first substrate and the polarizer. The nematic liquid crystal material has a positive anisotropy of refractive index, a retardation of 0.55 .mu.m to 1.75 .mu.m, and molecules twisted at a high degree with a twist angle of 180.degree. to 270.degree.. The simplex polymer film has a retardation of 20 nm to 200 nm.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: September 21, 1999
    Assignee: Seiko Instruments Inc.
    Inventors: Hiroyuki Fujita, Shigeru Senbonmatsu, Kaori Taniguchi, Shuhei Yamamoto, Theo Welzen