Passive electro-optical display device
AssigneeSiemens Aktiengesellschaft
InventorKarl M. Tauer
Life of this patent
Estimating the term…
Abstract
A passive optical display device, which has at least one digit place, has a cavity which is formed by space plates and contains a material which is switchable between different optical states by an electric field, and has electrodes on the surfaces of the plates with the electrode on one surface having seven segments characterized by the segment being interconnected into four separate groups and the electrodes on the other surface being in two parts with the shape of the groups and parts being selected so that if one of the parts or groups does not receive an electrical voltage when it should, the symbol becomes meaningless.
Claims12
In a passive optical display device having at least one digit place, said device comprising a pair of plates being connected together in space relationship to form a cavity containing a medium switchable between two optical states by an application of an electrical field, each of said plates on a surface facing the cavity having electrically conductive coatings with the coatings on a first of said pair of plates of each digit being arranged in an electrode pattern of seven segments having upper, center, and lower cross segments and upper left, upper right, lower left, and lower right side segments, and the second of said pair of plates being provided with two electrodes with the first of said electrodes overlying four of the seven segments of the first plate and the second of the two electrodes overlying the other three of the segments, the improvement comprising means for interconnecting the seven segments into four actuatable groups with three of said groups having two segments and the fourth group only having one segment, said means interconnecting the top cross and lower right side segments as group one, the upper right side and upper left side segments as group two, and the lower left side and the center cross segments as group three, said first electrode overlying a segment in each of said four groups and the second electrode overlying the other segment of the first three groups, said means for interconnecting and said first and second electrodes enabling creating a display of any number at each digit place and preventing displaying of a false number when any of the four groups and two electrodes fail to receive an electrical voltage.
In a passive optical display device having at least one digit place, said device comprising a pair of plates being connected together in space relationship to form a cavity containing a medium switchable between two optical states by an application of an electrical field, each of said plates on a surface facing the cavity having electrically conductive coatings with the coatings on a first of said pair of plates of each digit being arranged in an electrode pattern of seven segments having upper, center, and lower cross segments and upper left, upper right, lower left, and lower right side segments, and the second of said pair of plates being provided with two electrodes with the first of said electrodes overlying four of the seven segments of the first plate and the second of the two electrodes overlying the other three of the segments, the improvement comprising means for interconnecting the seven segments into four actuatable groups with three of said groups having two segments and the fourth group only having one segment, said means for interconnecting connecting top cross and upper right side segments as group one, the bottom cross and the upper left side segments as group two, the center cross and the lower left side segments as group three, said first electrode overlying a segment in each of said four groups and the second electrode overlying the other segment of the first three groups, said means for interconnecting and said first and second electrodes enabling creating a display of any number at each digit place and preventing displaying of a false number when any of the four groups and two electrodes fail to receive an electrical voltage.
Dependencies are inferred from the claim text.