Oki Electric Industry Co., Ltd.

Joled Inc.

Kenji Kokuda

Hitoshi Tsuge

Hidetaka Kodama

Hiroshi Furuya

Tetsuro Yamamoto

Shinichi Satoh

Masafumi Matsui

Takashi Osako

Shigeo Homura

Junji Kashiwada

Shinichi Fukuzako

Teppei Tanaka

Ryoichi Yasuda

A pixel circuit driving method is a method for driving a pixel circuit that includes a drive transistor that supplies a current corresponding to a signal voltage supplied via a signal line, a write transistor connected between the signal line and a gate electrode of the drive transistor, and an organic EL element that emits light in accordance with the current. The pixel circuit driving method includes supplying a reference potential to the gate electrode of the drive transistor before a threshold correction preparation operation of making a gate-source voltage of the drive transistor higher than a threshold voltage of the drive transistor.

Pixel circuit driving method, pixel circuit, and 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

An active-matrix display device includes: a pixel matrix that includes a plurality of pixel cells arranged in rows and columns; a first global power supply wire that is disposed for each of the columns in the pixel matrix and connected to each of the plurality of pixel cells in the column; and a second global power supply wire that is disposed for each of the columns in the pixel matrix and connected to each of the plurality of pixel cells in the column. Each of the plurality of pixel cells includes a local power supply wire that is connected to the first global power supply wire, and the local power supply wire does not overlap the second global power supply wire in a plan view of the pixel matrix.

Active-matrix display device

A driving circuit for an active-matrix liquid-crystal display short-circuits at least two of the signal lines in the matrix at times of transitions of signal-line potentials in the matrix. Charge stored in the parasitic capacitances of the signal lines is thereby recycled from one signal line to another, reducing the current consumption of the driving circuit. When alternating-current driving is employed, current consumption can also be reduced by reducing the frequency with which signal lines are driven from one side of a center potential to the other side.

Liquid-crystal display driving circuit and method

A display device comprises a plurality of first to fourth switching elements. On the basis of control signals from the drive control circuit, the common line is brought to the selected state when the common line is connected to the low-voltage portion for common lines by turning on the first switching element and turning off the second switching element; the common line is brought to the non-selected state when the common line is brought to the high-impedance state by turning off both the first and second switching elements; the data line is brought to the selected state when the data line is connected to the high-voltage portion for data lines by turning off the third switching element and turning on the fourth switching element; and the data line is brought to the non-selected state when the data line is connected to the low-voltage portion for data lines by turning on the third switching element and turning off the fourth switching element.

Matrix display device, matrix display driving method, and matrix display driver circuit

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Tokyo, Japan

Kenji Kokuda