Matsushita Electric Industrial Co., Ltd.

Joled Inc.

Toshiba Matsushita Display Technology Co., Ltd.

Panasonic Corporation

Hiroshi Takahara

Hitoshi Tsuge

Hideki Ohmae

Hideki Omae

Shinya Sannohe

Yoshito Miyatake

Atsuhiro Yamano

Masao Yamamoto

Yoshimasa Fushimi

Hirofumi Nakagawa

Mamoru Takeda

Kunio Sekimoto

Mitsuhiro Wada

Hideaki Mochizuki

Katsumi Adachi

Tsutomu Muraji

Hitoshi Noda

Tomoki Nakakita

Yasuhiro Horio

Jun Kamiyamaguchi

An EL display apparatus is provided. A display screen includes pixels arranged in a matrix, with each pixel including an EL device and a pixel circuit. A source driver circuit is configured to output an analog video signal to each pixel. A gate driver circuit is on at least one side of the display screen, with the gate driver circuit including first and second gate driver circuits. Each pixel includes a driving transistor, a first switch transistor, and a second switch transistor. A gate terminal of the first switch transistor is connected to a first gate signal line of the first gate driver circuit, and a gate terminal of the second switch transistor is connected to a second gate signal line of the second gate driver circuit. The first and second switch transistors are on/off controlled, independently, by the first and second gate driver circuits.

El display apparatus

EL display apparatus

An electroluminescent (EL) display apparatus and corresponding method of control are provided. A display screen includes gate signal lines which are arranged to intersect source signal lines. A pixel provided with an EL device corresponds to each intersection of the gate signal lines and the source signal lines. A driving transistor is provided for each pixel to supply a current to the EL device. A first switch transistor is provided for each pixel on a current path through which the current is supplied to the EL device. A gate driver circuit is connected to the gate signal lines. The gate driver circuit is configured to turn the first switch transistor on and off to simultaneously generate band-shaped non-display regions and band-shaped display regions on the display screen and to move the band-shaped non-display regions and the band-shaped display regions relative to the display screen.

An electroluminescent (EL) display apparatus and method of controlling are provided. A display screen includes gate and source signal lines. A pixel corresponds to each intersection of the gate and source signal lines. Each pixel includes: an EL device including anode and cathode terminals, the cathode terminal being connected to a common reference voltage; a driving transistor to flow a current to the EL device; a first switch transistor provided on a current path through which the current flows from a power line through the driving transistor to the EL device; a second switch transistor to supply, to the driving transistor, an image signal from one source signal line; and a third switch transistor provided between the anode terminal of the EL device and a voltage line. The voltage line is configured to supply a reverse bias voltage for reverse biasing the anode terminal of the EL device.

A gate driver IC (i.e., gate driver circuit), when set to a first mode by a logic signal of the terminal FNC*, shifts data in the gate driver IC in synchronization with one clock cycle of a clock inputted to the terminal CLK** (clock input terminal), and outputs a selection voltage or a non-selection voltage based on a data position in the gate driver IC; and when set to a second mode by a logic signal of the terminal FNC*, shifts data in the gate driver IC in synchronization with n clock cycles (n is an integer of at least 2) of a clock inputted to the terminal CLK**, and outputs the selection voltage or the non-selection voltage based on the data position in the gate driver IC.

Gate driver circuit including variable clock cycle control, and image display apparatus including the same

An electroluminescent (EL) display apparatus and method of controlling are provided. A display screen includes gate signal lines and source signal lines. A pixel corresponds to each intersection of the gate and source signal lines. Each pixel includes: an EL device including an anode and cathode terminals; a driving transistor to flow a current to the EL device; a first switch transistor provided on a current path through which the current flows from a power line through the driving transistor to the EL device; a second switch transistor to supply, to the driving transistor, an image signal from one of the source signal lines; and a third switch transistor provided between the anode terminal of the EL device and a voltage line. The voltage line is configured to supply a reverse bias voltage for reverse biasing the anode terminal of the EL device.

An electroluminescent (EL) display apparatus and method of control are provided. A display screen includes gate signal lines which intersect source signal lines. A pixel provided with an EL device corresponds to each intersection of the gate and source signal lines. A driving transistor is provided for each pixel to supply a current to the EL device. A first switch transistor is provided on a current path through which the current is supplied to the EL device. A gate driver circuit is connected to the gate signal lines. The gate driver circuit includes a shift register circuit, and outputs a select or non-select signal for the gate signal lines. The gate driver circuit turns the first switch transistor on and off to control a duty ratio of the display screen. The duty ratio is controlled by a start pulse fed to the shift register circuit.

An electroluminescent (EL) display apparatus and corresponding method of control are provided. A display screen includes gate signal lines which are arranged to intersect source signal lines. A pixel provided with an EL device corresponds to each intersection of the gate signal lines and the source signal lines. A driving transistor is provided for each pixel to supply a current to the EL device. A first switch transistor is provided for each pixel on a current path through which the current is supplied to the EL device. A gate driver circuit is connected to the gate signal lines. The gate driver circuit is configured to turn the first switch transistor on and off to simultaneously generate band-shaped non-display regions and band-shaped display regions on the display screen and to move the non-display regions and the display regions relative to the display screen.

A display apparatus includes: display pixels arranged in rows and columns, each display pixel being disposed at the intersection of one of gate signal lines arranged in rows and one of source signal lines arranged in columns; a gate driver IC capable of selecting the gate signal lines based on a designated order; a source driver IC that outputs a voltage signal to the source signal lines; and a TCON. The display pixels each include an organic EL element, a capacitor into which the voltage signal is written, a capacitor capable of receiving an electric charge in the capacitor, and a driving transistor that supplies a driving current corresponding to the magnitude of the electric charge in the capacitor to the organic EL element. The TCON sorts the order of writing to the rows so as to reduce the difference in the voltage signal between successive rows.

Display apparatus and display method

An EL display apparatus includes pixels each including an EL element, a drive transistor, and a switch transistor, and further includes: a source driver circuit; a source signal line; a gate driver circuit; a first gate signal line; and a second gate signal line, wherein the gate driver circuit applies, to the first gate signal line, a first voltage or a second voltage, and the drive transistor is placed in a first state by the gate driver circuit applying the first voltage to the gate terminal of the drive transistor while the switch transistor is on, and is placed in a second state by the gate driver circuit applying the second voltage to the gate terminal of the drive transistor while the switch transistor is on.

An electroluminescent (EL) display apparatus and method are provided. A display screen includes pixels. A pixel circuit of each of pixel includes, in part: a first switch transistor on a path through which current flows from a power line through a driving transistor to an EL device; a second switch transistor to supply an image signal to the driving transistor; and a third switch transistor for initially resetting the pixel circuit before the second switch transistor supplies the image signal. A gate terminal of the first switch transistor is connected to a first gate driver circuit. Gate terminals of the second and third switch transistors are connected to a second gate driver circuit, which includes a second gate signal line connected to both the gate terminal of the second switch transistor of a Nth row and the gate terminal of the third switch transistor of a (N+1)th row.

An EL display apparatus according to the present invention includes an EL device adapted to emit light at a luminance corresponding to a current fed thereto. A source driver outputs a current higher than a current corresponding to an analog video signal to the EL device through a source signal line. This operation charges/discharges a parasitic capacitance present in the source signal line. A second gate driver circuit controls a transistor formed between the EL device and the source driver to operate so that the EL device is fed with the current for only a part of a one-frame period. As a result, the El device emits light for only the part of the period.

Growing community of inventors

Osaka, Japan

Hiroshi Takahara