Kabushiki Kaisha Daini Seikosha

Kenichi Kondo

Noboru Kaneko

Shojiro Komaki

Ryuichi Kuronuma

A driving system for matrix display device having X electrodes and Y electrodes for displaying at selected crossing points of the electrodes is provided with a timing signal generator for controlling the X electrode scanning signals, a display signal converter receptive of a portion of display information addressed by a signal from the time signal generator for converting the display information into a portion of the signals for display. A memory device stores the portion of the signals for display and applies the same to the driving circuit for the Y electrodes. The drive to the Y electrodes is inhibited while information to be stored is being stored in the memory.

Driving system of display

In an electronic timepiece having a liquid crystal display and a dynamic driving circuit for producing a display driving signal having an effective driving voltage, the dynamic driving circuit is provided with a device for detecting the capacitance of the liquid crystal to sense a change in ambient temperature. The effective driving voltage of the display driving signal is adjusted in response to changes in the detecting capacitance and thereby the ambient temperature to compensate for the changes. In this way, the 'on' voltage of the display is maintained above the saturation voltage and the 'off' voltage of the display is maintained below the threshold voltage thereof over a wide temperature range so as to eliminate cross talk.

Electronic timepiece

An electronic alarm timepiece has a time counter, an alarm time memory circuit and a coincidence detector for detecting a coincidence between the time count and the stored alarm time for actuating an alarm. The alarm time memory circuit is a presettable counter and it is presettable to load the present time count in the time counter therein. In this way, a coarse adjustment of the alarm time can be set and a manually operable mechanism is provided to increment the count in the alarm time memory circuit to obtain the precise desired alarm time.

Electronic alarm timepiece with presettable alarm time memory

An alarm electronic timepiece comprising a timepiece circuit, a display for displaying time, an alarm for generating an alarm sound at an alarm time, a memory circuit for memorizing the alarm time and an alarm control circuit for controlling the tone quality and a sound volume of the alarm sound. The alarm control circuit includes externally operable switches of the timepiece which are operable for controlling the alarm sound and which are also operable for correcting time.

Alarm electronic timepiece

An electronic alarm watch including an oscillator for developing a repetitive time standard signal, a dividing circuit for dividing the time standard signal to develop repetitive output signals, and a counting circuit receptive of one of the repetitive output signals of the dividing circuit for counting the same to develop a count representing passage of time. A first waveform shaping circuit receives the output signal of the counting circuit and a higher repetition rate output signal of the dividing circuit for developing a pulse signal at a repetition rate equal to that of the counting circuit output signal and having a pulse width equal to that of the dividing circuit output signal. A coincidence detector detects when the count of the counting circuit and an alarm time signal coincide and develops an output signal in response to this condition. A second waveform shaping circuit receives the output of the coincidence detector for developing in response thereto a pulse signal having a width greater than the pulse width of the output pulse of the first waveform shaping circuit. An alarm responds to an output of the dividing circuit and an enabling signal for developing an alarm signal. A memory circuit responsive to the respective output signals of the first and second waveform shaping circuits applies an enabling signal to the alarm in response to the output of the second waveform shaping circuit, and terminates the enabling signal in response to the output of the first waveform shaping circuit. Accordingly, an alarm signal is developed when coincidence between the counting circuit count and the alarm time signal is detected, and the alarm signal is automatically terminated after an interval equal to the repetition rate of the first waveform shaping circuit output signal.

Alarm electronic watch

An electronic watch having a time counter for counting a time standard signal to develop a count representative of present time, a recurrent alarm time memory circuit for storing a recurrent alarm time, and a single alarm time memory circuit for storing a once-occurring alarm time. A setting circuit is operable for clearing the contents of the single alarm time memory circuit. A coincidence detecting circuit detects coincidence between the contents of the time counter and the contents of both memory circuits, and develops an output signal when coincidence is detected. Alarm time clearing circuitry responds to the output signal of the coincidence detecting circuit for enabling the setting circuit to clear the single alarm time memory after the once-occurring alarm time has occurred. An alarm circuit is responsive to the output signal of the coincidence detecting circuit for developing an alarm each time the contents of the time counter coincides with the contents of one of the memories.

Electronic watch with alarm mechanism

An electronic watch having an alarm means which produces alarm by sound or color phase when a time count coincides with an alarm setting time. A display device displays for selected alarm channels whether an alarm time is memorized or not, and the watch includes circuitry display setting times when a channel is selected and simultaneously to operate the channel displaying in a turn-on and off lighting mode of operation.

Electronic watch having an alarm means

An electronic alarm watch having a plurality of memories each for storing an alarm time for producing an alarm signal when an alarm time reached. A single alarm channel produces an alarm signal at a set time and after the first occurrence of the alarm signal no further alarm signal occurs at the set time. A recurring alarm channel produces an alarm signal at every occurrence of an alarm of that channel.

An electronic alarm timepiece having multi-channels for setting time wherein the time information of said channels is applied in a time sharing manner to a coincidence detecting circuit.

Electronic timepiece having an alarm device

An electronic wristwatch with an audible alarm device has an elongated casing in which there are two cavities separated from one another. An electronic time keeping unit is sealed in one of the cavities while an audio alarm device is housed in the other cavity. Preferably, the casing has a central portion from which opposite wing portions extend. The cavity for the time keeping unit is in the central portion while the cavity for the alarm device is in one of the wing portions. The cavity for the alarm device opens at the back of the casing and the alarm device is made up as a self-contained unit which fits into the cavity. A plurality of small holes extend from the cavity for the alarm device to the front of the casing for better transmission of sound.

Electronic wristwatch having an alarm device

An electronic timepiece including a plurality of counter circuits which together develop a count representative of time. A decoder circuit develops decimal signals representative of the counts developed by the respective counters, and a plurality of first switching circuits is operative to apply the respective counts developed by the respective counters in a timesharing mode. A plurality of second switching circuits, operating in synchronism with the first switching circuits, applies respective decimal signals, each corresponding to the count of a respective counter, to respective memory circuits for storage therein. The stored decimal signals are converted to serial binary signals by respective ones of a plurality of serial converting circuits, and the serial binary signals are applied to respective figure electrode driving circuits for developing figure electrode driving signals to drive figure electrodes of a display device having display elements each comprised of figure electrodes and separate segment electrodes. A segment electrode driving circuit intermittently drives the segment electrodes of the respective display elements in synchronism with the operation of the switching circuits to enable the respective display elements to display decimal figures corresponding to the contents of the respective counters and representative of time.

This invention relates to a liquid crystal display device, for driving a plurality of digits of liquid crystal display sequentially by using a time-sharing system.

Liquid crystal display device

An electronic timepiece is provided with a minute counter, an hour counter, a settable and resettable counter for storing an alarm time and a circuit for detecting the concidence between the stored alarm time and the contents of the minute and hour counters for developing a coinciding signal in response thereto and an alarm is produced in response to the coinciding signal. A first switch is switchable between a first and second state and a circuit is responsive to the coinciding signal for resetting the alarm time counter when the switch is in the first state and for maintaining the alarm counter in the set state when the switch is in the second state, whereby the timepiece can be selectively used in single alarm and repeat alarm modes.

A temperature compensating display device including a display operated by driving signals. A temperature detecting circuit periodically develops an oscillatory output signal having a frequency representative of ambient temperature, and the oscillatory signal is applied to a divider circuit for dividing the same. A selecting circuit receives the divided signal representative of ambient temperature and develops an oscillatory signal having a duty cycle representative of ambient temperature. A drive control circuit receives the selecting circuit output signal and voltage signals for developing driving signals and applying the driving signals to drive the display with the voltages at duty cycles corresponding to the duty cycles of the selecting circuit output signals. Accordingly, variations in driving voltages applied to the display compensate for ambient temperature variations, and this compensation is adjusted periodically each time the temperature detecting circuit develops its oscillatory output signal.

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Tokyo, Japan

Kenichi Kondo