US 10,854,140 B2Granted

Display device

AssigneeJapan Display Inc.

InventorsTetsuo Morita, Hiroyuki Kimura, Makoto Shibusawa, Hiroshi Tabatake, Yasuhiro Ogawa

Life of this patent

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Abstract

Disclosed is a display device including: a driving transistor, a first switching transistor, and a pixel transistor each having a gate and a pair of terminals; a storage capacitor having a pair of terminals; and a light-emitting element having an input terminal and an output terminal. One terminal of the driving transistor is electrically connected to one terminal of the pixel transistor. The other terminal of the driving transistor is electrically connected to one terminal of the first switching transistor and the input terminal of the light-emitting element. The other terminal of the first switching transistor is electrically connected to the gate of the driving transistor and one terminal of the capacitor. The one terminal of the capacitor overlaps with an active region of the driving transistor.

Claims13

Dependent claims

A display device comprising:

a power source line;
a driving transistor having a gate and a pair of terminals;
a first switch having a gate and a pair of terminals;
a pixel switch having a gate and a pair of terminals;
a reference switch having a gate and a pair of terminals;
a output switch having a gate and a pair of terminals;
a capacitor having a pair of terminals;
and
a light-emitting element having an input terminal and an output terminal,
wherein one of the pair of terminals of the driving transistor is electrically connected to one of the pair of terminals of the first switch and one of the pair of terminals of the output switch,
the other of the pair of terminals of the driving transistor is electrically connected to the power source line,
the other of the pair of terminals of the output switch is electrically connected to the input terminal of the light-emitting element,
the other of the pair of terminals of the first switch is electrically connected to the gate of the driving transistor and one of the pair of terminals of the capacitor,
the other of the pair of terminals of the capacitor is electrically connected to one of the pair of terminals of the pixel switch and one of the pair of terminals of the reference switch,
the other of the pair of terminals of the pixel switch is electrically connected to an image signal line receiving an image signal,
the one of the pair of terminals of the capacitor overlaps with an active region of the driving transistor,
the gate of the first switch functions as the gate of the pixel switch,
each of the active region of the driving transistor, an active region of the output switch, an active region of the pixel switch and an active region of the reference switch includes polysilicon,
the active region of the driving transistor and the active region of the output switch are connected in series between the power source line and the input terminal of the light-emitting element,
both of the active region of the driving transistor and the active region of the output switch are formed in a single polysilicon island,
a first function to prevent a leak current in the first switch is stronger than a second function to prevent a leak current in the pixel switch, and
the first function is stronger than a third function to prevent a leak current in the reference switch.

19 more elements

A display device comprising:

a power source line;
a driving transistor having a gate and a pair of terminals;
a first switch having a gate and a pair of terminals;
a pixel switch having a gate and a pair of terminals;
a reference switch having a gate and a pair of terminals;
a reset switch having a gate and a pair of terminals;
an output switch having a gate and a pair of terminals;
a capacitor having a pair of terminals;
and
a light-emitting element having an input terminal and an output terminal,
wherein one of the pair of terminals of the driving transistor is electrically connected to one of the pair of terminals of the first switch and one of the pair of terminals of the output switch,
the other of the pair of terminals of the driving transistor is electrically connected to the power source line,
the other of the pair of terminals of the output switch is electrically connected to the input terminal of the light-emitting element,
the other of the pair of terminals of the first switch is electrically connected to the gate of the driving transistor and one of the pair of terminals of the capacitor,
the other of the pair of terminals of the capacitor is electrically connected to one of the pair of terminals of the pixel switch and one of the pair of terminals of the reference switch,
the other of the pair of terminals of the pixel switch is electrically connected to an image signal line receiving an image signal,
the one of the pair of terminals of the capacitor overlaps with an active region of the driving transistor,
the gate of the first switch is shared by the pixel switch, the first switch and the reset switch,
each of the active region of the driving transistor, an active region of the output switch, an active region of the pixel switch and an active region of the reset switch includes polysilicon,
the active region of the driving transistor and the active region of the output switch are connected in series between the power source line and the input terminal of the light-emitting element,
both of the active region of the driving transistor and the active region of the output switch are formed in a single polysilicon island,
a first function to prevent a leak current in the first switch is stronger than a second function to prevent a leak current in the pixel switch,
the first function is stronger than a third function to prevent a leak current in the reference switch, and
the first function is stronger than a fourth function to prevent a leak current in the reset switch.

21 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/394,113Filed 25 Apr 2019 · continuation
Priority: JP 2016-16652829 Aug 2016
Published: US 2019/0251903 A115 Aug 2019
Granted: 1 Dec 2020
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
G02F 1/13452
Conductors connecting electrodes to cell terminals: conductors connecting driver circuitry and terminals of panels
G02F 1/13454
Conductors connecting electrodes to cell terminals: drivers integrated on the active matrix substrate
H10D 30/6755
Characterised by the active materials: oxide semiconductors, e.g. zinc oxide, copper aluminium oxide or cadmium stannate

Family

Application15/670,241Parent of this continuation · filed 7 Aug 2017
US 2019/0251903 A1Pre-grant publication · published 15 Aug 2019
US 10,319,297 B2Parent of this continuation
US 2018/0061317 A1Published application
US 10,854,140 B2This patent

From the US filing history. Foreign family members aren’t listed.