Light-Emitting Device and Electronic Apparatus

• US 20080017860A1
• Filed: 01/19/2007
• Published: 01/24/2008
• Est. Priority Date: 01/24/2006
• Status: Active Grant

• Current Assignee: Lumitek Display Technology Limited (Vector Capital Corporation)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: NOZAWA, Ryoichi, KUBOTA, Takehiko, KANDA, Eiji
• Granted Patent: US 7,872,264 B2
• Time in Patent Office: Days
• US Class Current: 257/59
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H10K 50/824 combined with auxiliary electrodes
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/1315 comprising structures specially adapted for lowering the resistance
• CPC Class Codes: H10K 59/80522 combined with auxiliary electrodes

Abstract

A light-emitting device includes a power feeding line to which a predetermined voltage is supplied; a light-emitting element formed of a first electrode, a second electrode, and a light-emitting layer interposed between the first electrode and the second electrode; and a driving transistor that controls the amount of current supplied to the light-emitting element from the power feeding line. The power feeding line includes a portion interposed between the first electrode and the driving transistor.

Claims

1. A light-emitting device comprising:

a power feeding line through which a predetermined voltage is supplied;

a light-emitting element formed of a first electrode, a second electrode, and a light-emitting layer interposed between the first electrode and the second electrode; and

a driving transistor that controls the amount of current supplied to the light-emitting element through the power feeding line;

the power feeding line including a portion interposed between the first electrode and the driving transistor.

2. The light-emitting device according to claim 1, further comprising a capacitor electrically connected to a crate electrode of the driving transistor, wherein the first electrode overlaps the capacitor.

3. The light-emitting device according to claim 1, further comprising a data line through which a data signal is supplied, wherein the driving transistor controls the amount of current according to the data signal, and the power feeing line includes a portion interposed between the first electrode and the data line.

4. The light-emitting device according to claim 1, further comprising a data line through which a data signal is supplied, the first electrode being a light-reflecting electrode formed on a surface of an insulating layer covering the data line, and a periphery of the first electrode overlapping the data line.

5. The light-emitting device according to claim 1, further comprising a selecting transistor that is turned on or off according to a selection signal, a gate electrode of the driving transistor being pulled to a potential corresponding to a data signal supplied through the data line via the selecting transistor when the selecting transistor is turned on, and the first electrode being formed in a region that the selecting transistor is not formed.

6. The light-emitting device according to claim 1, further comprising an initializing transistor that is turned on or off according to an initialization signal, a gate electrode and a drain electrode of the driving transistor being electrically connected to each other via the initializing transistor when the initializing transistor is turned on, and the first electrode being formed in a region that the initializing transistor is not formed.

15. An electronic apparatus comprising the light-emitting device according to claim 1.

7. A light-emitting device comprising:

a light-emitting element formed of a first electrode, a second electrode, and a light-emitting layer interposed between the first electrode and the second electrode;

a driving transistor that controls the amount of current supplied to the light-emitting element;

a capacitor electrically connected to a gate electrode of the driving transistor; and

an auxiliary line electrically connected to the second electrode, the auxiliary line being formed of a material having a resistivity lower than a resistivity of a material of the second electrode;

the auxiliary line being formed in a region that the driving transistor and the capacitor are not formed.

8. A light-emitting device comprising:

a selecting transistor that is turned on or off according to a selection signal;

an insulating layer overlapping the selecting transistor and having an aperture;

a light-emitting element formed of a first electrode, a second electrode, and a light-emitting layer, the second electrode covering the insulating layer, and the first electrode and the second electrode opposing each other via the light-emitting layer at least in a region inside the aperture;

a driving transistor that controls the amount of current supplied to the light-emitting element according to a data signal supplied through a data line via the selecting transistor when the selecting transistor is turned on; and

an auxiliary line formed on a surface of the insulating layer and electrically connected to the second electrode, the auxiliary line being formed of a material having a resistivity lower than a resistivity of a material of the second electrode.

9. The light-emitting device according to claim 8, the selecting transistor overlapping the auxiliary line.

10. A light-emitting device comprising:

an initializing transistor that is turned on or off according to an initialization signal;

an insulating layer overlapping the initializing transistor and having an aperture;

a light-emitting element formed of a first electrode, a second electrode, and a light-emitting layer, the second electrode covering the insulating layer, and the first electrode and the second electrode opposing each other via the light-emitting layer at least in a region inside the aperture;

a driving transistor that controls the amount of current supplied to the light-emitting element, a gate electrode and a drain electrode of the driving transistor being electrically connected to each other via the initializing transistor when the initializing transistor is turned on; and

an auxiliary line formed on a surface of the insulating layer and electrically connected to the second electrode, the auxiliary line being formed of a material having a resistivity lower than a resistivity of a material of the second electrode.

11. The light-emitting device according to claim 10, the initializing transistor overlapping the auxiliary line.

12. A light-emitting device comprising:

a plurality of control lines extending in a first direction;

a data line extending in a second direction and crossing the plurality of control lines, the second direction being different from the first direction; and

a plurality of unit elements arrayed in the second direction and located at positions corresponding to intersections between the plurality of control lines and the data line;

wherein each of the plurality of unit elements includes;

a light-emitting element formed of a first electrode, a second electrode, and a light-emitting layer interposed between the first electrode and the second electrode;

a driving transistor that controls the amount of current supplied to the light-emitting element according to a potential of a gate electrode of the driving transistor, the potential of the gate electrode being set according to a signal supplied through the data line; and

a control transistor that controls whether or not a predetermined voltage is to be supplied to the gate electrode of the driving transistor or whether or not a current is to be supplied to the light-emitting element, according to a signal supplied through a control line associated with the unit element among the plurality of control lines;

wherein, in a first unit element among the plurality of unit elements, the control transistor and the control line are located on a first side of the driving transistor in the second direction,

wherein, in a second unit element and a third unit element among the plurality of unit elements, the second unit element being adjacent to the first unit element on the first side in the second direction and the third unit element being adjacent to the first unit element on a second side in the second direction, the control transistor and the control line are located on the second side of the driving transistor in the second direction;

the data line including a plurality of first data-line portions and a second data-line portions, the plurality of first data-line portions being formed out of the same layer as the plurality of control lines and arrayed in the second direction, and the second data-line portion being formed on a surface of an insulating layer covering the plurality of control lines and electrically interconnecting the plurality of first data-line portions, and

the first data-line portions being formed contiguously in association with the first unit element and the third unit element, and the second data-line portion crossing the control line associated with the first unit element and the control line associated with the second unit element.

13. The light-emitting device according to claim 12, further comprising a power feeding line through which a predetermined voltage is supplied, the driving transistor controlling the amount of current supplied to the light-emitting element through the power feeding line, the power feeding line being formed out of the same layer as the second data-line portions of the data line, and the power feeding line including a portion of the first data-line portion, the portion of the first data-line portion being located in a space between the first unit element and the third unit element,

14. The light-emitting device according to claim 12, further comprising an auxiliary line electrically connected to the second electrode, the auxiliary line being formed of a material having a resistivity lower than a resistivity of a material of the second electrode, wherein the auxiliary line is formed so as to overlap the control transistor and the control line of the first unit element and the control transistor and the control line of the second unit element, and is not formed in a space between the first unit element and the third unit element.