Joled Inc.

Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Kenichi Masumoto

Hiroyuki Yamakita

Hiroki Yamamoto

Mika Nakamura

Tetsuro Nakamura

Akira Gyoutoku

Tetsurou Nakamura

Takafumi Hamano

Yuzo Kawano

Yuuji Toyomura

Masaharu Oyama

Yuji Toyomura

Shinya Yamamoto

Hiroaki Miyaso

An organic EL display apparatus includes: a display panel; a plate-shaped base disposed on a rear surface side of the display panel; a flexible wiring substrate; a circuit substrate; an electronic component attached to at least one of the wiring substrate and the circuit substrate; a heat conductive member attached to a rear surface of the electronic component; a rear structural member disposed to cover the heat conductive member; and a connecting member that connects the base and the rear structural member and generates a compressive force that compresses the heat conductive member being sandwiched by the electronic component and the rear structural member.

Organic EL display apparatus

The application discloses a method for manufacturing a luminescent panel including a luminescent area provided with emission pixels arranged in row and column directions. The manufacturing method includes a first step of dividing the luminescent area into segment areas so that each of the segment areas includes at least one of the emission pixels; a second step of selecting a part of the segment areas as a first area, and the segment areas adjacent to the first area in the row and column directions as second areas; and a third step of aging the emission pixel in the first area by energization to generate an aging area.

Method for manufacturing luminescent panel, aging device, and display device provided with luminescent panel

A method for manufacturing an emission panel which has an emission portion including pixels, through which currents of mutually different values flow under a condition that voltages of mutually identical values are applied to the respective pixels is disclosed. This manufacturing method includes: an acquisition step of acquiring correction coefficients for correcting the values of the voltages applied to the respective pixels to reduce differences among the values in current flowing through the respective pixels; and an aging step of executing aging processing on the pixels, the aging processing being executed by correcting the values of the voltages applied to the respective pixels using the correction coefficients and by applying the corrected voltages to the respective pixels.

Method for manufacturing emission panel, and display device provided with emission panel obtained by the method

The present application discloses a display panel including flexible substrates on which first power lines are mounted to supply power; a substrate including a first surface provided with a display area, a second surface opposite to the first surface, and second power lines for connecting the first power lines to the display pixels; a thermal conduction member partially covering the second surface and conducting heat in an in-plane direction; and a thermal conduction seal covering a periphery of the thermal conduction member. The first surface includes an arrangement area to arrange the second power lines between the flexible substrates and the display area. The second surface includes a first area opposite to the display area and a second area opposite to the arrangement area. The thermal conduction member covers at least the first area. The thermal conduction seal covers the second area.

Display panel and display device

A display apparatus is provided which optimally restores decreased luminance and extends a life of a light emitting element. The display apparatus includes a memory that stores a plurality of trap levels in association with a plurality of use durations of the light emitting element. An obtainer determines one of the plurality of use durations of the light emitting element. A controller reads, from the memory, one of the plurality of trap levels associated with the one of the plurality of use durations, and removes a charge from the light emitting element by application of a reverse bias voltage having a level associated with the one of the plurality of trap levels. The controller changes the level of the reverse bias voltage which is applied to the light emitting element so that as the one of the plurality of use durations increases, the level of the reverse bias voltage increases.

Display apparatus and control method for display apparatus

The present application discloses OEL display panel including OEL board including organic emission elements situated in respective emission regions compartmentalized by confining wall, and black matrix facing OEL board. The black matrix is provided with openings, each of which allows passage of light from each of the organic emission elements. Organic emission elements include first organic emission element with organic emission layer for emitting light in first emission color, and second organic emission element with organic emission layer for emitting light in second emission color different from first emission color. Openings include first opening corresponding to first organic emission element, and second opening corresponding to second organic emission element. First organic emission element has lower emission efficiency than second organic emission element does. Thermal conductivity is higher around first opening than second opening.

Organic electroluminescence display panel and display device

A display device includes luminescence pixels that each include a driving transistor, a luminescence element, and a switching transistor that switches between conduction and non-conduction between a data line and an anode or a cathode of the luminescence element. A data driving circuit supplies a signal voltage to the data line, and a bias supplying circuit supplies a predetermined bias voltage to the data line. A controller applies the predetermined bias voltage to the anode or the cathode of the luminescence element by causing a non-conduction state between the data line and the data driving circuit, causing a conduction state between the data line and the bias supplying circuit, and switching the switching transistor ON within a period in which a signal current does not flow to the luminescence element.

Display device and driving method thereof

A display device includes a luminescence element. A power line provides the luminescence element with an electric current. A capacitor accumulates a driving voltage corresponding to a data voltage. A driver flows the electric current according to the driving voltage accumulated in the capacitor through the luminescence element via the power line. A controller is configured to set a reverse bias voltage and an application time period according to an amount of luminescence produced by the luminescence element, and to determine luminance levels in luminescence periods. The controller sets the reverse bias voltage and the application time period according to a peak luminance of the luminance levels when a difference between the peak luminance and an average luminance of the luminance levels exceeds a predetermined threshold, and applies the reverse bias voltage for the application time period within an OFF period of the data voltage for removing an electric charge accumulated in the luminescence element. The OFF period is within one of the luminescence periods.

Display device and control method thereof

Display devices and methods capable of reversing brightness deterioration in electroluminescence elements while maintaining display quality, with simple pixel circuits and no manufacturing yield reduction, are provided. A display device includes luminescence pixels that each include a driving transistor, a luminescence element, and a switching transistor which switches between conduction and non-conduction states between a data line and the luminescence element. A data driving circuit supplies a signal voltage to the data line and a bias supplying circuit supplies a specified bias voltage to the data line. A control unit applies the specified bias voltage to an anode or cathode of the luminescence element by causing conduction between the data line and the data driving circuit, causing non-conduction between the data line and the bias supplying circuit, and turning the switching transistor ON, all within a period in which a signal current does not flow to the luminescence element.

Providing an exposure unit using an organic electroluminescence element with a large emitted light quantity. The organic electroluminescence element has, on a substrate, an anodeacting as a hole injection electrode, a cathodeacting as an electron injection electrode, a first and second emission layersandeach having a light emission region, and a charge generation layerinjecting electrons into the light emission layerlying close to the anodeand injecting holes into the light emission layerlying close to the cathode, these layers being arranged between the anodeand the cathode

Organic electroluminescence element and an exposure unit and image-forming apparatus both using the element

An image forming apparatus includes an exposer including an organic electroluminescence element including at least an anode for injecting a hole, a luminescent layer having a luminescent region and a cathode for injecting an electron on a board. A photosensitive member is formed with an electrostatic latent image by exposing light of the exposer, a developer forms a toner image on the photosensitive member by supplying a toner to the electrostatic latent image, and a cooler cools the organic electroluminescence element such that the temperature of the organic electroluminescence element can be controlled.

Image forming apparatus having a cooler for an organic electroluminescence element

An inkjet head driving circuit driving piezoelectric actuators for ink ejection provided on an inkjet head H includes one D/A converter that converts a digital signal into an analog voltage and outputs the analog voltage, and a waveform generating portion into which an output voltage of the D/A converter is input, and which generates a voltage rising waveform when the output voltage of the D/A converter is larger than a predetermined potential that is midway between a maximum value and a minimum value of that output voltage, and generates a voltage rising waveform when the output voltage of the D/A converter is smaller than the predetermined potential.

Waveform generating circuit, inkjet head driving circuit and inkjet recording device

An inkjet head driving circuit driving piezoelectric actuators for ink ejection provided on an inkjet head H is provided with an analog switch ( ) whose input can be switched between the output voltage of a D/A converter ( ) and ground potential, and outputs either that output voltage or ground potential to a waveform generating portion . The analog switch ( ) is configured such that when a digital signal for generating a voltage rising waveform (voltage falling waveform) with the waveform generating portion is input into the D/A converter ( ), the input into the analog switch ( ) is switched from ground potential to the output voltage of the D/A converter ( ).

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Osaka, Japan

Kenichi Masumoto