Sharp Kabushiki Kaisha Corporation

Yusuke Sakakibara

Hirohisa Yamada

Tatsuya Ryohwa

Keisuke Kitano

Masaki Yamamoto

Masumi Kubo

Yoshihiro Ueta

Makoto Izumi

Kenji Kimoto

Kyohko Matsuda

A display device includes a plurality of light-emitting layers each capable of emitting light in a reference direction orthogonal to a light-emitting surface, and a light-blocking portion capable of blocking part of light traveling from the light-emitting surface in directions inclined with respect to the reference direction. The plurality of light-emitting layers include a first light-emitting layer capable of emitting light with a first peak wavelength and a second light-emitting layer capable of emitting light with a second peak wavelength that is longer than the first peak wavelength. The first light-emitting layer has, compared with the second light-emitting layer, a large ratio of the part of light that can be blocked by the light-blocking portion to light traveling in at least one certain direction out of the inclined directions.

Display device having reduced tint difference in display surface between different view angles

A method of manufacturing a display device includes: the measurement step of sweeping a voltage to light-emitting elements and measuring a current value that flows in the light-emitting elements in response to a voltage value applied; the computation step of computing a first derivative value of the current value with respect to the voltage value, the first derivative value representing voltage dependence of a first derivative of the current value; the peak determination step of determining a peak of the first derivative value; the processing step of processing the light-emitting elements based on a result of the peak determination step; and the attaching step of attaching a housing to the substrate.

Method of manufacturing display device

A display device includes a plurality of light-emitting elements each including: a first electrode; a second electrode; and a light-emitting layer between the first electrode and the second electrode, the plurality of light-emitting elements including: at least one main light-emitting element containing quantum dots in the light-emitting layer; and at least one set of compact light-emitting elements including a plurality of compact light-emitting elements smaller than the at least one main light-emitting element.

Display device

A display device including a light-emitting element including a first electrode, a second electrode, a light-emitting layer, a first charge transport layer having a function of transporting first charge, and a second charge transport layer having a function of transporting second charge, in which the display device includes a first inspection element including a fourth electrode and a third electrode. The first inspection element is a single-charge element including the light-emitting layer and the first charge transport layer that are common to the light-emitting element and making mainly the first charge flow, and the light-emitting element is driven in accordance with characteristics of the first inspection element.

A light-emitting element includes: a cathode; an anode; and an electron-transport layer, a light-emitting layer, and a hole-transport layer provided, between the cathode and the anode, in a stated order from the cathode. At least one of the electron-transport layer or the hole-transport layer includes: a first charge-transport layer and a second charge-transport layer containing different carrier-transport materials. The light-emitting element includes, in plan view, a first region including the first charge-transport layer, and a second region including the second charge-transport layer. The light-emitting element shares the anode and the cathode between the first region and the second region.

Light-emitting element, light-emitting device, method for manufacturing light-emitting element, and method for driving light-emitting element

A light-emitting device includes a first sub-pixel provided with a first light emitter, and a second sub-pixel provided with a second light emitter and constituting, together with the first sub-pixel, one of a plurality of pixels. The first light emitter has a first cathode, a first anode, and a first light-emitting layer containing a first quantum dot and disposed between the first cathode and the first anode. The second light emitter has a second cathode, a second anode, and a second light-emitting layer containing a second quantum dot and disposed between the second cathode and the second anode. The second quantum dot emits light having a longer light-emission wavelength than the first quantum dot. The first light-emitting layer is thicker than the second light-emitting layer.

Light-emitting device for improving internal quantum efficiency

Provided is a light-emitting element to highly efficiently emit light in different colors. The light-emitting element includes: a cathode; an anode; a light-emitting layer formed between the cathode and the anode, and including a plurality of light-emitting regions respectively emitting light of different wavelengths; and an electron-transport layer formed between the cathode and the light-emitting layer, and including a plurality of regions each corresponding to one of the light-emitting regions. The electron-transport layer includes a ZnMgO film (where X is 0≤X<1). Of the plurality of regions included in the electron-transport layer, a region, corresponding to one of the light-emitting regions that emits light of a shorter wavelength, is higher in composition ratio X of Mg and/or less in thickness of the ZnMgO film.

Light-emitting element for efficiently emitting light in different colors

An inspection circuit in a display device includes: a measuring circuit configured to sweep a voltage to the display device and to measure a current value that flows in a light-emitting element in response to a voltage value applied; a computation circuit configured to compute a first derivative value of the current value with respect to the voltage value, the first derivative value representing voltage dependence of a first derivative of the current value; a peak determination circuit configured to determine a peak of the first derivative value; and a processing circuit configured to process the light-emitting element based on a result of the determination by the peak determination circuit.

Display device and method of driving display device

A pixel is divided into a first subpixel and a second subpixel. A first data signal is input to a first drive unit that drives a first light-emitting element constituting the first subpixel, and a second data signal is input to a second drive unit that drives a second light-emitting element constituting the second subpixel. A gray scale value of the first data signal is smaller than a gray scale value of the second data signal.

Display and display driving method

For a purpose of simplifying a structure of a light-emitting element while maintaining luminous efficiency of the light-emitting element, the present invention provides a light-emitting element including: a cathode electrode; an anode electrode; a light-emitting layer between the cathode electrode and the anode electrode; an electron transport layer between the light-emitting layer and the cathode electrode; and a hole transport layer between the light-emitting layer and the anode electrode. The light-emitting element further includes a plurality of subpixels for each light emission wavelength of the light-emitting layer, the light-emitting layer and the electron transport layer for each of the plurality of subpixels, and the hole transport layer common to at least the plurality of subpixels.

Light-emitting element having commonly formed hole transport layer and anode electrode and light-emitting device

Type and moisture content of a sheet of paper are determined with high accuracy for controlling an image forming condition, accordingly. A coping machine includes a transmitted-light measuring unit, a reflected-light measuring unit, a type determination unit configured to determine a type of a sheet of paper, a moisture content calculation unit configured to calculate a moisture content of the sheet of paper, based on the type of the sheet of paper determined by the type determination unit and the intensity of the light measured by the reflected-light measuring unit, and an image forming condition setting unit configured to set an image forming condition for the sheet of paper.

Growing community of inventors

Osaka, Japan

Yusuke Sakakibara