An all electronic type timepiece is disclosed which comprises a customary or usual display for displaying time, a calendar, a.m., p.m., colon and other functions. An additional display element is provided separately from the customary display or alternatively is constructed as a part thereof for displaying the operating condition of a time counter circuit even when the customary display is extinguished.

A watch having a liquid crystal display for the digital display of time in response to timing signals produced by divider and driving circuits, which in turn produce said timing signals in response to the high frequency time standard signal of a quartz crystal oscillator. A switch means is coupled to said driving circuits for rendering said liquid crystal display inoperative without disturbing said oscillator and divider circuit.

This disclosure depicts an electronic timepiece having complementary electro-optical and electro-mechanical displays. The electro-mechanical time display displays continuously the hours and minutes of the day, the most used time functions. The electro-optical display is normally off and is activated by user or circuit command to display at least one additional time-related function having a lower normal use factor than hours or minutes.

Disclosed is a combination wristwatch and wrist calculator. The wristwatch comprises an eight digit electro-optical display indicating time and calendar information when in the time display mode and indicating the result of a computation when in the calculate mode. A manually operated mode switch controls the display and calculations are entered by way of a miniature keyboard on the watch face.

A watch module construction including a digital display device composed of a liquid crystal display cell and an analog display device composed of time indicating hands. A cell support frame is disposed on one side of each of a base plate and a circuit board aligned substantially on the same plane as the base plate. The cell support frame has a first recess in which the liquid crystal display cell is disposed, and a second recess in which the time indicating hands are disposed. An IC chip is mounted on the other side of the circuit board in substantially axial alignment with the display cell, and a wheel train mechanism is disposed on the other side of the base plate in substantially axial alignment with the time indicating hands. A single lamp is disposed at a substantially central portion of the watch module construction in the vicinity of an outer periphery of the liquid crystal display cell and an outer periphery of the analog display device to simultaneously illuminate both of the digital display device and the analog display device.