摘要:
An electronic timepiece having a rotatable operating member such as a crown, with switch and pulse generation means coupled to the operating member whereby a number of pulses can be produced each time the operating member is rotated, these pulses being used to modify time information displayed by the timepiece.
摘要:
A circuit for producing a digital output varying linearly with temperature changes by measuring the width of a pulse from a monostable multivibrator, in which the pulse is measured more than twice in succession and the results added. A greater change in the digital output for a given temperature change is achieved, providing higher measurement accuracy.
摘要:
Drive signals are applied to the segment and digit electrodes of a liquid crystal display device in a time-multiplexed manner by means of a control circuit adapted to control first and second gates the output of one of which is selected as a segment signal by selection means, and further adapted to control a digit signal generating circuit for producing a digit signal that cooperates with the segment signal to drive the display. The effective application of drive signals allows a reduction in the number of segment electrodes and in the quantity of associated wiring so that the degree of integration on an IC chip can be increased.
摘要:
An electronic time piece system is comprised of storing means for storing keeping time data and including counter means responsive to timing signals supplied from a synthesizer, circuit means for setting keeping time data in the storing means, and display means for displaying the keeping time data. The electronic time piece system may be coupled with an option system by which the storing means is supplied with additional data.
摘要:
A driver circuit for an electrochromic display device which includes segment electrodes and a common electrode. The driver circuit has a power source, switching means connected between the power source and the segment electrodes, and circuit means disposed between the common electrode and the power source. The circuit means is operative to couple the common electrode to either a positive terminal or a negative terminal of the power source, whereby an electric current will flow through the segment electrodes in bleaching and coloring directions with the use of a single power source.
摘要:
A driver circuit for an electrochromic display device for an electronic timepiece. In a first preferred embodiment, drive signals are applied through a plurality of source follower first and second metal oxide semiconductor field effect transistors to segment electrodes of the electrochromic display device. The first and second transistors have source electrodes connected together and also connected to the segment electrode to lower the voltage being applied across the segment electrode and a common electrode to drive the display device at a lower voltage. In a second preferred embodiment, the common electrode of the display device is alternately coupled to the high and low potentials of the battery by means of an inverter circuit composed of source follower transistors, which function to reduce the voltage being applied across the segment electrodes and the common electrode.
摘要:
An electronic device, having a liquid crystal display cell, includes a driving circuit for changing the state of the liquid crystal cell in accordance with the energized state of the cell thereby preventing the cell from deteriorating due to the energization by a direct current.
摘要:
An electronic timepiece, used as a pager watch, has a speaker for emitting an alarm sound at a preset time and also for reproducing an external call signal intercepted by a receiver for incoming electromagnetic waves. The receiver may be maintained normally inactive, being periodically activated for short time intervals under the control of a frequency divider in the output of a crystal oscillator serving to drive an electro-optical display. Sensors responsive to abnormal ambient conditions, e.g. temperature or blood pressure of the wearer, may also operate the speaker.
摘要:
In an electronic timepiece having a primary frequency divider circuit coupled to receive a standard frequency signal and comprising a group of P-channel FETs and a group of N-channel FETs, a bias circuit supplies a bias input to the P-channel FET group and a separate bias input to the N-channel FET group. By providing these bias inputs through current mirror coupling from a standard current source, the response of the primary frequency divider circuit to low amplitudes of the standard frequency signal can be made substantially independent of timepiece battery voltage variations, over a wide range of battery voltages.
摘要:
There is disclosed an input circuit for portable electronic devices comprising an exteriorly operable member for delivering an operating signal to a portable electronic device and including a first flip-flop set in synchronism with an edge of said operating signal, a second flip-flop for reading therein said operating signal and a reset signal preparing circuit supplied with an output from said second flip-flop and preparing a reset signal for said first flip-flop.