Joled Inc.

Shigeo Homura

Shinya Ono

Hitoshi Tsuge

Kouhei Ebisuno

Masafumi Matsui

Takashi Osako

Kenji Kokuda

Ryoichi Yasuda

A display device includes: pixels arranged in a matrix; a plurality of write signal lines for selecting a pixel row to which a data voltage is to be written; a gate driver that supplies a gate signal; a plurality of data signal lines for writing the data voltage; a data driver that supplies the data voltage; a data selector circuit that supplies, per at least one data signal line by time division, the data voltage; and a controller. Each of the pixels includes a light-emitting element, a capacitor element, and a drive transistor that supplies a current in accordance with the voltage held by the capacitor element to the light-emitting element. The controller causes the gate driver and the data driver to perform an initialization operation on pixels in a second pixel row after a period during which a write operation is performed on pixels in a first pixel row.

Display device

An active-matrix display device includes a pixel matrix having a plurality of pixel cells arranged in rows and columns, and a data line disposed for each of the columns in the pixel matrix and connected to each pixel cell in a column. Each pixel cell includes a holding capacitor, including a first electrode connected to a gate of the drive transistor, a lower electrode connected to a source of the drive transistor, and an upper electrode connected to the source of the drive transistor. At least one of the lower electrode and the upper electrode protrudes toward the data line from a facing region in a plan view of the pixel matrix, such that a protruded amount, which is an amount of protrusion toward the data line, is greater than or equal to 15% of a distance between the data line and the first electrode in the facing region.

Active-matrix display device

A display panel includes a contact area which includes an upper conductive layer forming first electrodes of the organic EL elements, a lower conductive layer disposed below the upper conductive layer, a middle layer between the upper conductive layer and the lower conductive layer, and an insulating layer between the lower conductive layer and the middle layer. The middle layer includes a first area and a second area which are conductive and electrically connected to the upper conductive layer, and an insulating separating area which separates the first area and the second area. The lower conductive layer includes a first line which is electrically connected to the first area via a first contact hole, and a second line which is electrically connected to the second area via a second contact hole.

Display panel and display device

In an active-matrix display device, each of the plurality of pixels includes a holding capacitor that includes: a gate electrode that is included in a first wiring layer and is connected to a gate of a drive transistor which drives a light-emitting element; a first source electrode that is included in a lower wiring layer disposed lower than the first wiring layer and is connected to a source of the drive transistor; and a second source electrode that is included in an upper wiring layer disposed higher than the first wiring layer and is connected to a source of the drive transistor. At least one of the first source electrode and the second source electrode protrudes toward the data line from the facing region and overlaps the gate electrode in the facing region in the plan view of the pixel matrix.

Provided is a method for driving a display device including: a display unit having a sub-pixel having a first light emitting element (organic EL element) and a first driving transistor for supplying a first electric current corresponding to a first gray level signal, and a sub-pixel having a second light emitting element (organic EL element) and a second driving transistor for supplying a second electric current corresponding to a second gray level signal; and a power supply unit configured to apply a power supply voltage to each sub-pixel via an electric current path that is common to the sub-pixel and the sub-pixel. The driving method includes correcting the first gray level signal based on the first gray level signal and the second gray level signal so as to compensate for a reduction in the first electric current caused by a voltage drop that occurs in the electric current path.

Display device and method for driving same

A method for driving a display device that includes a display unit and is driven by a sequence of row-by-row sequential scanning that includes a vertical blanking period, the display unit having pixels arranged in rows and columns, each pixel including an anode formed on a drive circuit layer, an organic light emitting layer formed above the anode and including a light emitting substance, and a transparent cathode formed above the organic light emitting layer, the method includes initializing a circuit element, writing a signal voltage to a capacitive element, inserting a black display to display the black display during a period determined based on a resistance value of the transparent cathode, and causing the organic EL element to emit light.

Display device and method for driving display device

A display device comprising pixel circuits arranged in a matrix, in which each of the pixel circuits includes: an EL element; a capacitor for storing voltage; a drive transistor that provides, to the EL element, a current corresponding to the voltage stored in the capacitor to cause the EL element to emit light; a voltage supplier that applies a reference voltage to the drive transistor in an initialization period, and applies a reverse bias voltage to the drive transistor in a predetermined period before the initialization period, the reference voltage being higher than a threshold voltage of the drive transistor and providing a forward bias between the gate and source electrodes of the drive transistor, the initialization period being a period for initializing the pixel circuit, the reverse bias voltage providing a reverse bias between the gate and source electrodes of the drive transistor.

Growing community of inventors

Tokyo, Japan

Shigeo Homura