Abstract:
A liquid crystal or other display device employing a drive and control circuit for activating selected segments of the display with a bidirectional current utilizing integrated circuit technology with a low voltage DC primary power supply to produce and control the bidirectional current. Accordingly, said DC power supply is utilized to operate a multivibrator circuit which at first and second outputs thereof provides rectangular waveforms varying alternately between a first and a second DC level to cause bidirectional current flow through the crystal when a return path is implemented through a bidirectional current conducting switch.
Abstract:
In a digital electronic wrist watch employing a liquid crystal display cell for indicating the time, there is included indicia which flashes once per second so as to allow the counting of seconds and to indicate operation of the display.
Abstract:
An electronic timepiece such as a wrist watch of the type employing all solid state components including an electronic or a liquid crystal output display for indicating time, utilizes a high efficiency up-converter to enable a small physical and low voltage battery to provide energy for the entire electronic watch assembly by applying said battery voltage to an inductor which conducts current under control of a switching circuit. The control of current through the inductor at specified intervals causes a high voltage pulse train to be developed which is then rectified to provide a higher DC voltage for providing operating potential for the entire electronic assembly of the timepiece. The stability of the voltage output can be enhanced by means of a feedback regulator.
Abstract:
A decoder-driver network for energizing a liquid crystal display used in a timepiece to cause the same to provide any one of a plurality of presentations according to any one of a number of coded formats. The decoder-driver circuit uses bidirectional devices arranged in series paths to minimize components and increase reliability.
Abstract:
A liquid crystal cell comprises a transparent top support plate having a transparent conductive coating thereon, a bottom support plate smaller than the first support plate and having a reflective conductive coating on one surface thereof and a black coating on its opposite surface is centered with respect to and spaced from the top support plate, a layer of a liquid crystal composition fills the space between the support plates, a metal cover encloses the bottom support plate and liquid crystal layer and is sealed around its periphery to the top support plate by means of a metal frit and solder. The cover is insulated from the top support plate by means of a dielectric insulating layer on the support plate. Spring means are provided which are bonded to the cover and the bottom support plate for holding the bottom support plate in position. A method for assembling the structure is described.