Seiko Epson Corporation

Tetsuro Matsumoto

Masayoshi Todorokihara

Aritsugu Yajima

Tomoyuki Okuyama

A frequency synthesizer includes: an oscillating section that generates a first signal; a frequency ratio measuring section that measures a frequency ratio of the first signal and a second signal by using the first signal and the second signal; a comparing section that compares the frequency ratio, which is measured by the frequency measuring section, with a target value of a frequency ratio; and a filter that is disposed on a preceding stage of the comparing section. A frequency of the first signal of the oscillating section is adjusted on the basis of a comparison result of the comparing section.

Frequency synthesizer

A power generator includes a photocell having a sheet-like shape provided with an opening therethrough and another photocell having a sheet-like shape that is accommodated in the opening and connected to the photocell in series. The center of the opening coincides with the center of the another photocell.

Power generator, timepiece, and method for manufacturing power generator

An actuator is equipped with a moveable partthat moves according to changes in an intake amount of air, a cylinderthat contains air and pumps the air through a fluid pipeto the moveable partaccording to pressure applied to the air, and a pistonthat applies pressure to the air in the cylinder. Further, the actuator is equipped with a motorthat generates rotational force, and a screwand a slide nutthat convert the rotational force to a force to move the piston. The air is enclosed in the moveable part, the cylinderand the fluid pipe

Actuator

An actuator includes an electrolyte membrane, first and second driving electrodes that are disposed on the opposite surfaces and that give a potential difference to the electrolyte membrane, a sensor that is formed on the electrolyte membrane and that detects a force acting on the electrolyte membrane, and a driving control circuit that supplies a drive voltage to the first and second driving electrodes on the basis of an instruction signal and a detection output of the sensor. The driving control circuit applies a PWM drive voltage with a duty ratio corresponding to a difference between the instruction signal and the detection output of the sensor across the first driving electrode and the second driving electrode.

An electro-optical device includes a temperature detecting unit that detects temperature, wherein the electro-optical device sets a number of sub-frames of plural sub-frames included in one frame according to the temperature detected by the temperature detecting unit and sets a luminance level of pixels in each of the plural sub-frames to at least a first level or a second level to perform gradation display.

Electro-optical device, driving method therefor, and electronic apparatus

A display drive circuit that performs digital driving for displaying an image of each one frame based on luminance data of a plurality of subframes is disclosed. The display drive circuit includes a conversion section that converts the luminance data having a plurality of bits indicating a luminance level of each of the plurality of subframes into data indicating the luminance level for pixels in a number greater than the number of the plurality of subframes, and a storage section that stores the data converted by the conversion section.

Conversion circuit, display drive circuit, electro-optical device and electronic equipment

An electro-optical device includes a pixel that has an electro-optical element with a light transmittance that changes to a predetermined value in response to an applied voltage, which changes in response to the temperature. A light source irradiates light to the pixel. A driving unit includes a predetermined number of sub-fields having the same length in one frame. The driving unit provides either an on-voltage indicating light-on or an off-voltage indicating light-off to the pixel in each of the predetermined number of the sub-fields in response to the grayscale to be displayed. A temperature measuring unit measures the temperature and outputs a temperature signal. A time controlling unit controls the length of one sub-field on the basis of the temperature signal. A light intensity controlling unit controls the intensity of the light incident on the pixel on the basis of the temperature signal.

Growing community of inventors

Chino, Japan

Tetsuro Matsumoto