Abstract: A multi-function LED wristwatch in which all the required functions may be performed with the use of only two push button switches. These switches are time demand for displaying hours, minutes and seconds and date demand for alternatively displaying day of month, month of year, AM or PM of time, and day of week. They also perform all the setting functions for these displays and through sequential button depression and digital logic circuits, five of the functions, namely hours, minutes, day of the month, month of the year, and day of the week may be set independently.

Abstract: An improved wristwatch calculator has all of the active circuit elements contained on three chips mounted on the same substrate member in the watch case. A watch chip and a calculator chip each have their outputs connected to a single interface chip consisting of CMOS or I.sup.2 L active elements which multiplex the watch and calculator chip outputs and select the appropriate display as a function of watch mode selection by pushbutton or inertia time demand switches or calculator mode selection by activation of the appropriate calculator keyboard switch on the watch face. The interface chip outputs are connected to six electro-optical display stations.

Abstract: Disclosed is an analyzer for producing a digital display of the rate of deviation of a solid state wristwatch from a predetermined norm. It comprises a counter and calculator into which are gated a series of high frequency pulses for a period of time dependent upon the operating frequency of the wristwatch time base under test. Included is a keyboard connected by a manual switch to the calculator so that the device may be operated in a calculator mode as well as a clock circuit by means of which the digital display may be used to indicate time.

Abstract: Disclosed is a solid state wristwatch of relatively small size useful as a small man's watch or even a ladies' watch. It incorporates an arm responsive inertial switch for energizing a light emitting diode display. The display forms part of a timing module and is mounted on one side of a laminar ceramic substrate. Mounted on the other side of the substrate is a combination timepiece and calendar circuit chip. Printed circuits are formed on non-contacting surfaces of the substrate laminations and interconnected by conductive pins. The entire timing module is staked to a plastic frame which also carries the watch batteries, quartz crystal, trimmer capacitor, switches, or other watch components.

Abstract: Disclosed is a solid state wristwatch of relatively small size useful as a small man's watch or even a ladies' watch. It incorporates an arm responsive inertial switch for energizing a light emitting diode display. The display forms part of a timing module and is mounted on one side of a laminar ceramic substrate. Mounted on the other side of the substrate is a combination timepiece and calendar circuit chip. Printed circuits are formed on non-contacting surfaces of the substrate laminations and interconnected by conductive pins. The entire timing module is staked to a plastic frame which also carries the watch batteries, quartz crystal, trimmer capacitor, switches, and other watch components.

Abstract: Disclosed is a solid state wristwatch of small size particularly adapted for use as a ladies' watch. A plurality of small individual display stations formed of light emitting diodes are mounted on one side of a laminar ceramic substrate. The stations are viewed through a window formed of hardened red glass arcuately curved in the direction of the long dimension of the display. The watch case or bezel is similarly curved to conform to the window providing a more pleasing appearance and to conserve space.

Abstract: Disclosed is a solid state wristwatch having a digital light emitting diode display and a low battery voltage circuit for actuating the display to indicate the approach of battery failure. The battery voltage sensing circuit draws power only when the display is energized and causes one of the display stations to blink. It comprises a silicon band gap reference voltage circuit for comparing the battery voltage with a reference voltage that is independent of temperature and battery voltage variations.

Abstract: Disclosed is a solid state wristwatch having an active electro-optical display in the form of light emitting diodes. The display is mounted on one sloping side of a groove in a circular module frame and comprises a ceramic substrate having the display on one side and a large scale integrated circuit on the other. The angular orientation of the display coincides with the axis of an angularly oriented viewing window constructed so that the watch case shades at least part of the display. Viewing under bright daylight is enhanced and through ambient light responsive control of current to the display, battery energy under most viewing conditions is conserved.

Abstract: Disclosed is a highly stable CMOS oscillator for use as the master time reference in a wristwatch. A novel bias circuit comprising a CMOS pair and a relatively large resistor supply a bias voltage to the amplifier of the oscillator. The resistor can be made larger than normal because it is outside the oscillator feedback loop and does not reduce the amplifier open loop gain.

Abstract: This invention relates to a solid state timepiece and more particularly to an electronic watch which employs no moving parts. In the present invention a frequency standard in the form of a crystal oscillator acts through a solid state electronic circuit divider and display actuator to power in timed sequence the light-emitting diodes of an electro-optic display. Low cost, low power consumption and small size and weight are achieved through the use of a charge coupled binary divider chain.