Electronic watch
Patent 6252829 Issued on June 26, 2001. Estimated Expiration Date: 
June 5, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 5, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPaging receiver with variable color indicators Optical panel capable of switching between reflective and transmissive states Patent #: 5686979 InventorsAssigneeApplicationNo. 090986 filed on 06/05/1998US Classes:368/242, With liquid crystal display (i.e., LCD)349/14, For protection349/69, Electroluminescent light source349/97, Color349/108With plural colors for each display element (i.e., each pixel or segment)ExaminersPrimary: Miska, Vit W.Attorney, Agent or FirmForeign Patent References
International ClassesG04C 017/00G02F 001/133.5 Foreign Application Priority Data1997-06-09 JPAbstractAn electronic watch diversifies the mode of display for numeric information and the like to presents the information using the natural ambient light or a back light. The electronic watch may includes a polarizer for transmitting a linearly polarized light polarized in one direction while absorbing the remaining polarized light, a liquid crystal element that selects a state in which the polarization of a polarized light ray is changed through transmission and a state in which the polarization of the polarized light is not changed, a polarization separating film, opposed to the polarizer with the liquid crystal element interposed therebetween, and a back light for emitting light to the liquid crystal element through the polarization separating film. The polarization separating film 12 transmits light polarized in one direction while reflecting light linearly polarized in a direction perpendicular to the one direction. When the emission of the light emitting device is used to present the numeric information and the like, the information is presented by the emission of the back light.Other References
Field of SearchWith electro-optical displaySolid body light emitter (e.g., LED) Liquid crystal display (i.e., LCD) Optical With circular pattern of light sources With solid body light emitter (e.g., LED) With liquid crystal display (i.e., LCD) Particular illumination Diffuser between light source and liquid crystal With plural diverse light sources (e.g., for day and night) Electroluminescent light source With color formed by different color polarizer or color filter associated with each cell Polarizer Color Color filter With different liquid crystal thickness for each color of filter With plural colors for each display element (i.e., each pixel or segment) | |
