The keyboard for the computer portion of a combined electronic digital watch - computer device is hinged so as to be foldable into either a useable mode or a non-accessable mode, and the individual keys include triggers extending upwardly from the bottom of an elongated depression formed by surrounding side walls, the triggers being positioned eccentrically within the depression.

An electronic timepiece comprises a digital display device and electronic circuitry including a printed circuit board containing thereon a pattern of printed conductors connected to drive the digital display device. A cover member is disposed atop the timepiece casing and on a side portion of the cover member are mounted a plurality of depressable key switches, the key switches being mounted at a location overlying and spaced from the pattern of printed conductors. An electro-conductive rubber sheetlike member coacts with the cover member for both sealing in a water proof manner the region between the cover member and the timepiece casing and effecting electrical connection between individual ones of the key switches and the pattern of printed conductors in response to depression or actuation of the key switches.

An electronic diary having combined clock-calendar means and diary storage means is provided wherein a random access memory is employed in a diary mode of operation for the storage and readout of preselected daily schedule and message events keyed for visual display in response to equal time comparisons with real time of day TOD as generated by the clock-calendar means. The electronic diary is capable of being added to present state-of-the-art electronic calculators for facilitating economy of parts through commonality of keyboard, power supply and visual display features. The electronic diary is comprised of a keyboard selector panel, power supply means, a message storage and control unit, a clock and calendar unit, display control logic, time comparison logic, audible alarm, and visual display means. Optionally, the electronic diary is comprised of a keyboard selector panel, power supply means, memory, micro-processor circuit, and visual display means. The electronic diary can serve to remind the user of an important message event through application of an audible alarm while visually displaying the associated message data.

There is disclosed an integral instrument providing timekeeping and display with calculator functions and display accomplished by means of a keyboard assembly mounted on the watch casing and adapted to be worn about a user's wrist. Included is time sharing circuitry to enable common display drivers for the timekeeping and calculating modes as well as power sharing circuitry to enable the use of inexpensive and reliable P-MOS circuitry in the calculator mode without constantly dissipating power. A time-zone setting circuit utilizes logic circuitry to automatically enable the user to change time by direct access to the existing keyboard assembly.

Disclosed is a calculator casing having a prism display window for shifting the angle of light transmission therethrough to provide a more desirable viewing angle. A low profile calculator having a liquid crystal, light emitting diode, or gas discharge tube display has interposed between the viewer and the display elements a prism window for shifting the viewing angle and filtering undesirable ambient light.