El display apparatus

Patent metadata

Field	Value
Publication number	US-2016163264-A1
Application number	US-201414904741-A
Country	US
Kind code	A1
Filing date	Jun 12, 2014
Priority date	Jul 18, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

An EL display apparatus includes: gate driver ICs (i. e., gate driver circuits); a plurality of pixels; gate signal lines each transmit a selection voltage for selecting a pixel from the pixels and non-selection voltage for placing a pixel in a non-selection state; and TCON. The pixels each include: a driving transistor; an EL element; a first switching transistor; and a second switching transistor. The gate driver ICs each include scanning and outputting buffer circuits which are connected to TCON to which an output signal of each of the scanning and outputting buffer circuits is inputted.

First claim

1 . An electroluminescence (EL) display apparatus of an active matrix type which includes a display screen in which pixels are disposed in a matrix, the EL display apparatus comprising;
a source driver circuit which outputs a video signal to be applied to the pixels; a source signal line which transmits the video signal output by the source driver circuit; a gate driver circuit; and a first gate signal line and a second gate signal line each of which transmits a selection voltage for selecting a pixel from the pixels and a non-selection voltage for placing a pixel in a non-selection state, wherein the pixels each include: a driving transistor; an EL element; a first switching transistor disposed in a pathway of current which flows through the EL element; and a second switching transistor which applies the video signal to the driving transistor, the gate driver circuit includes: a first scanning circuit and a second scanning circuit, the first gate signal line is connected to a gate terminal of the first switching transistor, and the second gate signal line is connected to a gate terminal of the second switching transistor, the EL display apparatus further comprises a control circuit for exchanging a signal with the gate driver circuit and the source driver circuit, the first scanning circuit and the second scanning circuit are connected to the control circuit, and an output signal of each of the first scanning circuit and the second scanning circuit is inputted to the control circuit.

2 . An electroluminescence (EL) display apparatus of an active matrix type which includes a display screen in which pixels are disposed in a matrix, the EL display apparatus comprising;
a source driver circuit which outputs a video signal to be applied to the pixels; a source signal line which transmits the video signal output by the source driver circuit; a first gate driver circuit; a second gate driver circuit; and a gate signal line which transmits a selection voltage for selecting a pixel from the pixels and a non-selection voltage for placing a pixel in a non-selection state, wherein the first gate driver circuit and the second gate driver circuit each include a data input terminal and a data output terminal,
the pixels each include: an EL element; a driving transistor which supplies current to the EL element; and a switching transistor disposed in a pathway of the current,
the gate signal line is connected to a gate terminal of the switching transistor,
the gate line has one end connected to the data output terminal of the first gate driver circuit, and another end connected to the data output terminal of the second gate driver circuit,
a control pulse is inputted to the data input terminal, sequentially shifted in each of the first gate driver circuit and the second gate driver circuit, and output from the data output terminal,
the selection voltage is output to the gate signal line when the control pulse has a first polarity,
the non-selection voltage is output to the gate signal line when the control pulse has a second polarity,
the current is supplied to the EL element as a result of applying the selection voltage to the gate signal line, and is interrupted as a result of applying the non-selection voltage to the gate signal line,
the control pulse having the first polarity and the control pulse having the second polarity form paired control pulses, and
the paired control pulses are inputted substantially simultaneously to the data input terminal of the first gate driver circuit and the data input terminal of the second gate driver circuit, at least twice in a period in which the first gate driver circuit and the second gate driver circuit each scan the display screen once.

3 . The EL display apparatus according to claim 1 ,
wherein the control circuit deactivates the first scanning circuit and the second scanning circuit when the output signal of the first scanning circuit and the output signal of the second scanning circuit are at a high level or at a low level for a specified period of time.

4 . The EL display apparatus according to claim 1 ,
wherein the control circuit detects the output signal of the first scanning circuit and the output signal of the second scanning circuit at least twice in one frame period.

Assignees

• Joled Inc

Inventors

• Nishimura Masaru
• Kato Toshiyuki
• Nakagawa Hirofumi

Classifications

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title

• G09G2320/041

  Temperature compensation · CPC title

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G2310/068

  Application of pulses of alternating polarity prior to the drive pulse in electrophoretic displays · CPC title