Seiko Epson Corporation

Hiroaki Jo

Toshiyuki Kasai

Hiroshi Horiuchi

Takeshi Nozawa

Shinsuke Fujikawa

Toshiaki Miyao

Eiji Kanda

Tsukasa Eguchi

Atsushi Ito

A display device includes a touch panel; a drive circuit that controls the touch panel; an arithmetic circuit that calculates operation content on the touch panel; and a control circuit that controls the arithmetic circuit, in which the drive circuit includes a first wiring for outputting information for calculating the operation content on the touch panel to the arithmetic circuit; and a second wiring for outputting a signal indicating that the touch panel is operated to the control circuit.

Display device and communication method

A level shift circuit is for converting a level of input signal which has a logic level at a first input electric potential and a logic level at a second input electric potential and generating an output signal which a logic level at a first output electric potential corresponding to the first input electric potential and logic level at a second output electric potential corresponding to the second input electric potential.

Level-shift circuit, electro-optical device, and level shift method

Disclosed is a pixel circuit including a light emitting element having one terminal and the other terminal, a driving transistor that supplies a driving current to the one terminal of the light emitting element, a first power line electrically connected to the other terminal of the light emitting element and receiving a first potential, a control transistor provided between a second power line, which receives a second potential, and a source of the driving transistor, and having a gate that receives a control signal through a control line, a first capacitor provided between the second power line and a gate of the driving transistor, a second capacitor provided between the gate and the source of the driving transistor, and a select transistor provided between a data line, which receives a data potential, and the gate of the driving transistor, and having a gate that receives a scanning signal through a scanning line.

Pixel circuit, driving circuit, light emitting apparatus, electronic apparatus and driving method of pixel circuit

A data line driving circuit connected to data lines includes a bit shift unit that outputs input digital data composed of a plurality of bits for defining the brightness of pixels or bit-shifts the plurality of bits to lower levels to output them, based on a control signal, and a supply unit that supplies the output digital data of the bit shift unit to a D/A conversion unit. The D/A conversion unit supplies gray-scale signals obtained by D/A converting the output digital data of the supply unit to the data lines.

Data line driving circuit, electro-optical device, data line driving method, and electronic apparatus

Disclosed herein is a light-emitting device including: a plurality of light-emitting elements which emit light with light intensities according to the levels of driving currents; a plurality of current generation circuits which are provided in correspondence with the plurality of light-emitting elements, have a plurality of current sources, and combine currents output from the plurality of current sources to output the combined currents as the driving currents; and a plurality of memories which store control signals for controlling the currents output from the plurality of current sources; wherein the levels of the currents of the plurality of current sources are different from one another, and wherein at least one of the plurality of memories is commonly connected to the current sources corresponding to predetermined current in at least two of the plurality of current generation circuits.

Light-emitting device and image forming apparatus

A light-emitting device includes four or more rows of element groups each having light-emitting elements arranged in a first direction, the element groups being arranged in parallel in a second direction different from the first direction. In each of a plurality of unit regions arranged in the first direction, the light-emitting elements belonging to the four or more rows of element groups are arranged at different positions by ones. The four or more rows of element groups includes a first element group, a second element group, and a third element group adjacent to the second element group. In each of the plurality of unit regions, the light-emitting element belonging to the second element group is disposed on one side in the first direction when viewed from the light-emitting element belonging to the first element group, and the light-emitting element belonging to the third element group is disposed on the other side in the first direction when viewed from the light-emitting element belonging to the first element group.

Light-emitting device and electronic apparatus

A light emitting apparatus includes a light emitting element formed on a surface of a substrate and a light receiving element formed on an area other than an area overlapping the light emitting element on the surface of the substrate, the light receiving element detecting light emitted from the light emitting element.

Light emitting apparatus and electronic device

A light emitting device includes a plurality of light emitting elements aligned along a reference line, a plurality of lenses that collects light emitted from the plurality of light emitting elements, and a drive circuit that allows either a first light emitting element or a second light emitting element to emit light. The plurality of lenses includes a first lens and a second lens that is disposed on an opposite side of the first lens with the reference line interposed therebetween, and a distance between the center of the first lens and the reference line is the same as a distance between the center of the second lens and the reference line. The plurality of light emitting elements includes the first light emitting element and the second light emitting element that is disposed on an opposite side of the first light emitting element with the reference line interposed therebetween. A distance between the first light emitting element and the reference line is the same as a distance between the second light emitting element and the reference line.

Light emitting device and electronic apparatus

An electro-optical device includes a plurality of pixel circuits each including a light-emitting element and a driving transistor for driving the light-emitting element; data lines that are connected to the plurality of pixel circuits and that supply data signals representing light-emitting gray-scale levels to the pixel circuits; and a data line driving circuit that supplies the data signals to the pixel circuits through the data lines. In addition, the data line driving circuit applies to each pixel circuit in a predetermined sequence a forward frame period supplying a data signal having a forward bias voltage for making the light-emitting element emit light and a backward frame period supplying a data signal having a backward bias voltage for making the light-emitting element not emit light, and drives each of the pixel circuits.

Electro-optical device, method of driving the same, and electronic apparatus

An electro-optical device includes a plurality of driving transistors turned on or turned off in accordance with a plurality of pulse-width modulation signals. An electro-optical element is electrically connected to drains of the plurality of driving transistors and emits light at a luminance corresponding to a drive current. A data signal generator generates a data signal in accordance with a plurality of pieces of data such that, the logical level of the data signal corresponds to the logical level of the corresponding pulse-width modulation signal for the corresponding section. Pulse-width modulation signal generators are provided for each respective driving transistors.

Electro-optical device that includes a plurality of driving transistors turned on and off in accordance with a plurality of pulse width modulation signals

A light emitting device includes a substrate having transparency, a light emitting element that emits light at least to the substrate side, and a light detecting element that is formed between the light emitting element and the substrate. The light detecting element is formed along an outer frame of the light emitting element in a plan view.

An electro-optical device includes a plurality of unit circuits; a first selecting circuit that sequentially selects the plurality of unit circuits; and a first signal line through which correction data for the individual unit circuits are supplied serially. Each of the plurality of unit circuits includes an electro-optical element that exhibits an intensity corresponding to a driving current, a storage circuit that obtains correction data from the first signal line when the first selecting circuit selects the unit circuit and that stores the correction data; and a control circuit that controls the driving current supplied to the electro-optical element according to intensity data specifying the intensity exhibited by the electro-optical element and the correction data stored in the storage circuit.

Electro-optical device controlling driving current to each electro-optical element to alleviate variation of intensity

A drive circuit of an electro-optical device comprising electro-optical elements of which each gray scale is controlled in accordance with a data signal output to a data line includes a reference current that generates unit generating reference current and a signal output unit that generates the data signal corresponding to a current value of the reference current generated by the reference current generating unit on the basis of gray-scale data and outputs the generated data signal to the data line. The reference current generating unit performs a refresh operation of setting the current value of the reference current to a predetermined value plural times.

Electro-optical device, drive circuit, driving method, and electronic apparatus

A control method for controlling an optical head having a plurality of light emitting devices, includes: dividing the plurality of light emitting devices into a plurality of blocks by grouping adjacent light emitting devices of the plurality of light emitting devices; adjusting levels of driving signals supplied to the adjacent light emitting devices for each of the plurality of blocks so that emission luminances of the adjacent light emitting devices belonging to the each of the plurality of blocks become substantially equal to each other; and adjusting emission periods so that the equalized emission luminances of the plurality of blocks become substantially equal to each other.

Optical head, control method thereof, and image forming apparatus

To provide an electro-optical device, a driving method therefor, and an electronic apparatus which can accurately control the brightness of electro-optical elements in accordance with the signal level of a data signal. A brightness detection circuitis provided which samples power-supply current Io every time one scan line is selected and which converts the power-supply current Io into a digital voltage signal DS having a digital value corresponding to the power-supply current Io. A light-emission-period control circuitgenerates light-emission-period control signals Hto Hn in accordance with a light-emission-period adjusting signal F corresponding to the digital voltage signal DS and outputs the light-emission-period control signals Hto Hn to corresponding control-signal supply lines Gto Gn. Further, light-emission-period control transistors of the pixelswhich are connected to the corresponding control-signal supply lines Gto Gn are on/off controlled, thereby controlling the light-emission period of the electro-optical elements.

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Suwa, Japan

Hiroaki Jo