Patents by Inventor Theo L. Welzen

Theo L. 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).

  • Patent number: 5959602
    Abstract: In a liquid-crystal display device having a matrix structure, a plurality of lines is selected simultaneously during periodic scanning of the line electrodes, and the total selection time is split into a number of time intervals which occur distributed over the frame time. The select voltages required can be chosen to be considerably smaller than the voltages according to the standard Alt & Pleshko multiplex addressing scheme, which results in considerably lower voltages over the display elements during selection. These lower voltages, combined with the splitting of the total selection period per frame time into a number of time intervals distributed over the frame time lead to a reduction of the so-called "FRAME RESPONSE" behavior and therefore result in improved contrast and brightness of rapidly switching liquid-crystal effects compared to the Alt & Pleshko addressing.
    Type: Grant
    Filed: February 7, 1996
    Date of Patent: September 28, 1999
    Assignee: Citizen Watch Co., Ltd.
    Inventor: Theo L. Welzen