International Business Machines Corporation

Kyocera Corporation

Chi Mei Optoelectronics Corporation

Lg Display Co., Ltd.

Chimei Innolux Corporation

Yoshinao Kobayashi

Shinya Ono

Akashi Satoh

Seiji Munetoh

Yoshitami Sakaguchi

Takatoshi Tsujimura

Shinji Takasugi

Taro Hasumi

Akihiro Kuroda

Kohichi Miwa

Keigo Kanoh

Hiroshi Ishikawa

Kazuo Sekiya

Akinori Sato

Hideto Niijima

Hironao Sone

Ken Namura

Nobuyuki Oba

Hideto Nijima

Kenya Katoh

It is aimed to provide a technology capable of stabilizing light-emitting luminance of an image display device. In order to achieve the above-mentioned object, an image display device includes a pixel circuit including a light-emitting element, a recognizing portion which recognizes a predicted value of a parameter on driving of the pixel circuit based on image data, and an obtaining portion which obtains an actually-measured value of the parameter while causing the light-emitting element to emit light in accordance with the image data. This image display device further includes a comparing portion which compares the predicted value and the actually-measured value with each other, and a control portion which controls a power supply voltage applied to the pixel circuit in accordance with a comparison result of the comparing portion. The control portion increases/decreases, in response to a fact that the actually-measured value falls outside a first reference range with the predicted value being as a reference, the power supply voltage so that the actually-measured value is included in a second reference range which is within the first reference range and is narrower than the first reference range, and stops the increase/decrease of the power supply voltage in a case where a relationship in which the actually-measured value is included in the second reference range is satisfied. Note that the control portion may be provided outside the image display device.

Image display device, control method for an image display device, and adjustment system for an image display device

A pixel circuit has a light emitting element and a driver electrically connected to the light emitting element. A reverse bias voltage is applied to the driver to reduce a shift amount of a threshold voltage of the driver.

Pixel circuit, image display apparatus, driving method therefor and driving method of electronic device

The present invention suppresses a phenomenon in which an oblique line appears on a display screen when the scanning line direction of a moving image is changed in an image memory. To accomplish the above-mentioned object, an image display device includes: a storage portion configured to store image data for a first frame constituting the moving image and for a second frame subsequent to the first frame, and having first to third memory areas; a writing portion configured to write the image data for the first frame into the first and second memory areas and to write the image data for the second frame into the first and third memory areas; a reading portion configured to read the image data for the first frame from the first and second memory areas and to read the image data for the second frame from the first and third memory areas, the reading portion changing a scanning line direction for the image data for the first and second frames to be read to a second scanning line direction different from a first scanning line direction that is a scanning line direction for the image data prior to the writing; and a display portion configured to output the image data for the read first and second frames in time sequence in a visible manner.

Image display device, electronic device, display controller and display control method

A driver for driving a display panel having a light emitting element includes a plurality of control pads, each of which is electrically connected to a control line of the display panel; and a plurality of power source pads, each of which is electrically connected to a power source line of the display panel and is larger in area than the control pad. The control pads and the power source pads are arranged in line and an order of arrangement of the control pads and the power source pads is symmetrical with respect to a direction of pad arrangement.

Driver for display panel and image display apparatus

According to one embodiment, an image display apparatus includes a plurality of pixels. Each pixel has a light emitting device; a drive transistor electrically connected to the light emitting device; and a capacitor electrically connected to the drive transistor. A ratio of an area occupied by the drive transistor per one pixel to an area of the one pixel is equal to or more than 0.05.

Image display apparatus

A display unit has an organic light emitting diode (OLED)provided in correspondence with each of pixels and capable of emitting light by itself, a drive transistorfor driving the OLED, a twig transistorwhich is formed so as to have a portion of an electrode of the drive transistorindependently formed, and which is used to detect a threshold voltage (Vth) of the drive transistor, a compensating capacitorin which the threshold voltage (Vth) detected by the twig transistoris written, a signal capacitorin which a signal voltage to be supplied to the drive transistoris written, a first transistorprovided between a data line and the signal capacitor, a second transistorprovided between the signal capacitorand the compensating capacitor, and a third transistorprovided between a gate electrode and another electrode of the twig transistor

Display unit, drive circuit, amorphous silicon thin-film transistor, and method of driving OLED

Pixel circuit, image display apparatus, driving method therefor and driving method of electronic device utilizing a reverse bias voltage

An image display apparatus includes a plurality of pixels. Each pixel includes a light emitting device; a drive transistor that has a gate electrode, a source electrode, and a drain electrode. One of the source and drain electrodes are electrically connected to one end of the light emitting device. Each pixel also includes a first switching transistor that electrically connects the gate electrode and the one electrode according to a scan signal, and a capacitor that has first and second electrodes. The first electrode is electrically connected to the gate electrode. The apparatus also includes a data line connected to the second electrode; a data line drive circuit that supplies a brightness potential and a reference potential for the brightness potential to the data line.

Image display apparatus and method for driving the same

An image display apparatus includes a light emitting element that emits light depending on an injected electric current; a driver that includes at least a first terminal and a second terminal, and controls the light emitting element based on a potential difference, applied between the first terminal and the second terminal, of a level higher than a predetermined threshold; a storage capacitor that serves to retain a potential on the first terminal of the driver; and a controller that changes the potential on the first terminal via the storage capacitor at writing of electric data current corresponding to a display in a black level.

Image display apparatus and method of driving same

An image display apparatus includes a current-controlled light emitting; a transistor which controls a first current flowing through the current-controlled light emitting diode, based on a first voltage applied between the gate and the source of the transistor at a light emitting phase; a capacitor arranged between the gate and the source. The image display apparatus also includes a current determining unit which controls a second current flowing between the source and the drain, based on a third voltage applied thereto at the writing phase. The second voltage is written in the capacitor at a writing phase and depends on the second current.

A pixel circuit includes a driver element that is supplied with a potential from a data line. The driver element controls a value of current passing through an electric light emitting element. Upon obtaining a threshold voltage, a conductive member connected to the electric light emitting element is made to be a floating state to cause the driver element to become on-state, variations in the potential of the conductive member caused by charges passing through the driver element to flow into the conductive member are detected by a threshold voltage detector to obtain the threshold voltage of the driver element.

Image display apparatus using current-controlled light emitting element

A display apparatus according to the present invention is equipped with a data writing section that includes a data line which supplies electric potential and a first switching section that controls writing of electric potential supplied, and a threshold voltage detecting section that includes a second switching section which controls conduction between a gate electrode and a drain electrode of the driver element and a current light emitting element which is a capacitor that supplies electric charge to the driver element.

Display apparatus controlling brightness of current-controlled light emitting element

An image display apparatus includes a current-controlled light emitting diode emitting light with brightness corresponding to a current flowing therethrough; a wiring structure electrically connected to the current-controlled light emitting diode; and a potential controller controlling a potential of the wiring structure. The image display apparatus also includes a potential change assisting unit controlling electric conductivity between the potential controller and the wiring structure, to change a potential of the wiring structure after a light emitting phase.

A display device includes a driver circuit that controls so that an electric charge accumulation and a voltage detection/supply start simultaneously for a pixel circuit in a first row in the matrix and a pixel circuit in a second row in a matrix and adjacent to the pixel circuit in the first row in one direction along a column, and that controls so that the electric charge accumulation and the voltage detection/supply end simultaneously for the pixel circuit in the first row and a pixel circuit in a third row and adjacent to the pixel circuit in the first row in another direction along the column.

Display device and method of driving the same

A method for testing an OLED substrate comprises: the first step of obtaining a first current value passing through a switching element group connected to a selection signal line; the second step of obtaining a second current value passing through a switching element group connected to a data signal line; and the third step of operating a current passing through each switching element including an OLED element from the current value for each pulse signal obtained by each of the steps 1 and 2.

Growing community of inventors

Kanagawa, Japan

Yoshinao Kobayashi