US 2018/0018918 A1Published application

Display device, display module, electronic device, and method for driving display device

AssigneeSemiconductor Energy Laboratory Co., Ltd.

InventorHiroyuki MIYAKE

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Abstract

Control of a light emission period of a light-emitting element results in higher visibility. A display device includes a signal line, a first scan line, a second scan line, and a pixel circuit. The pixel circuit includes a light-emitting element, a first transistor, a second transistor, a third transistor, and a capacitor. The second transistor is turned on by application of voltage that is lower than voltage applied to the first scan line to the second scan line after the second transistor is turned off by second voltage. Thus, a gate of the third transistor is controlled by the voltage applied to the second scan line. The display device has a function of controlling the light emission period by turning off the third transistor by the second scan line.

Claims9

Dependent claims

A display device comprising:

a signal line;
a first scan line;
a second scan line;
and
a pixel circuit,
wherein the pixel circuit includes a light-emitting element, a first transistor, a second transistor, a third transistor, and a capacitor,
wherein a gate of the first transistor is electrically connected to the first scan line,
wherein one of a source and a drain of the first transistor is electrically connected to the signal line,
wherein the other of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the third transistor,
wherein a gate of the second transistor is electrically connected to the first scan line,
wherein one of a source and a drain of the second transistor is electrically connected to the second scan line,
wherein the other of the source and the drain of the second transistor is electrically connected to a gate of the third transistor,
wherein one electrode of the capacitor is electrically connected to the gate of the third transistor,
wherein the other electrode of the capacitor is electrically connected to the one of the source and the drain of the third transistor,
wherein the one of the source and the drain of the third transistor is electrically connected to the one electrode of the light-emitting element,
wherein the first scan line is configured to output first voltage and second voltage lower than the first voltage,
wherein the second scan line is configured to output third voltage and fourth voltage lower than the third voltage,
wherein the second transistor is turned on by the fourth voltage after the second transistor is turned off by the second voltage, and
wherein the third transistor is turned off by the fourth voltage after the second transistor is turned on.

16 more elements

A method for driving a display device comprising a display portion and a gate driver,

wherein the display portion includes a plurality of signal lines, a plurality of first scan lines, a plurality of second scan lines, a first pixel circuit, and a second pixel circuit,
wherein the first pixel circuit and the second pixel circuit each include a light-emitting element, a first transistor, a second transistor, a third transistor, and a capacitor,
wherein the gate driver is electrically connected to the plurality of first scan lines and the plurality of second scan lines,
wherein the first scan line is electrically connected to gates of the first transistor and the second transistor included in the first pixel circuit and gates of the first transistor and the second transistor included in the second pixel circuit,
wherein the second scan line is electrically connected to one of a source and a drain of the second transistor included in the first pixel circuit and one of a source and a drain of the second transistor included in the second pixel circuit,
wherein the gate driver is configured to output a first scan signal to the plurality of first scan lines,
wherein the gate driver is configured to output a second scan signal to the plurality of second scan lines,
wherein a first period and a second period are included in one frame period,
wherein in the first period, light emission and gradation of the light-emitting element are controlled, and
wherein in the second period, turning-off of the light-emitting element is controlled.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/643,702Filed 7 Jul 2017
Priority: JP 2016-13770412 Jul 2016
Published: 18 Jan 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

G09G 3/3233
Using an active matrix: with pixel circuitry controlling the current through the light-emitting element
G06F 3/0446
By capacitive means: using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
G09G 3/3266
Organic, e.g. using organic light-emitting diodes [OLED]: details of drivers for scan electrodes
G09G 3/3426
Using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines:…