Light-emitting device and electronic apparatus

• US 20060017672A1
• Filed: 06/28/2005
• Published: 01/26/2006
• Est. Priority Date: 07/26/2004
• Status: Active Grant

• Current Assignee: Element Capital Commercial Company Pte. Ltd.
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Aoki, Koji
• Granted Patent: US 7,772,766 B2
• Time in Patent Office: Days
• US Class Current: 345/77
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2310/0232 Special driving of display border areas
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2330/04 Display protection
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/325 the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/88 Dummy elements, i.e. elements having non-functional features

Abstract

A light-emitting device includes a plurality of unit circuits that are arranged in an element forming region on a substrate, each unit circuit having a light-emitting element that has a first electrode and a second electrode, and a transistor that controls a current flowing in the light-emitting element, a plurality of power lines that are wired in a peripheral region disposed in a periphery of the element forming region so as to supply power having different potentials, a current supply line that is wired to extend from the peripheral region to the element forming region and that is electrically connected to the first electrode via the transistor in each of the unit circuits, and a current supply line protective circuit that is provided in the peripheral region and that has protective elements connected between the current supply line and the plurality of power lines.

Claims

1. A light-emitting device comprising:

a plurality of unit circuits that are arranged in an element forming region on a substrate, each unit circuit having a light-emitting element that has a first electrode and a second electrode, and a transistor that controls a current flowing in the light-emitting element;

a plurality of power lines that are wired in a peripheral region disposed in a periphery of the element forming region so as to supply power having different potentials;

a current supply line that is wired to extend from the peripheral region to the element forming region and that is electrically connected to the first electrode via the transistor in each of the unit circuits; and

a current supply line protective circuit that is provided in the peripheral region and that has protective elements connected between the current supply line and the plurality of power lines.

3. The light-emitting device according to claim 1, further comprising:

a scanning line driving circuit that supplies scanning signals to the unit circuits via scanning lines or a data line driving circuit that supplies data signals to the unit circuits via data lines, in the peripheral region,

wherein the scanning line driving circuit or the data line driving circuit includes complementary transistors, and

the plurality of power lines are a plurality of power lines that supply power to the scanning line driving circuit or the data line driving circuit.

4. The light-emitting device according to claim 3, further comprising:

resistive elements that are provided between the data lines and the data line driving circuit or between the scanning lines and the scanning line driving circuit, in the peripheral region.

5. The light-emitting device according to claim 1, further comprising:

scanning lines that are wired to extend from the peripheral region to the element forming region so as to supply scanning signals to the unit circuits; and

a scanning-line protective circuit that is provided in the peripheral region and that has protective elements connected between the scanning lines and the plurality of power lines.

7. The light-emitting device according to claim 3,

wherein the scanning-line protective circuit includes a plurality of diodes that are connected in series to one another and that are arranged across intersections between one of the plurality of power lines and the scanning lines.

8. The light-emitting device according to claim 1,

wherein, in the peripheral region, the current supply line includes:

a main line that extends to surround the element forming region; and

a plurality of branch lines that extend from the main line into the element forming region, and

the plurality of branch lines are connected to one another in the element forming region.

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

2. A light-emitting device comprising:

a plurality of unit circuits that are arranged in an element forming region on a substrate, each unit circuit having a light-emitting element that has a first electrode and a second electrode, and a transistor that controls a current flowing in the light-emitting element;

a plurality of power lines that are wired in a peripheral region disposed in a periphery of the element forming region so as to supply power having different potentials;

a current supply line that is wired to extend from the peripheral region to the element forming region and that is electrically connected to the first electrode via the transistor in each of the unit circuits;

a plurality of data lines that are wired to extend from the peripheral region to the element forming region so as to supply data signals to the unit circuits; and

a data-line protective circuit that is provided in the peripheral region and that has protective elements connected between the data lines and the plurality of power lines.

6. The light-emitting device according to claim 2,

wherein the data-line protective circuit includes a plurality of diodes that are connected in series to one another and that are arranged across intersections between the current supply line and the data lines.

9. A light-emitting device in which, on a substrate, an element forming region has a light-emitting region and a non-light-emitting region formed in a periphery of the light-emitting region, the light-emitting device comprising:

a plurality of unit circuits that are arranged in the light-emitting region, each unit circuit having a light-emitting element that has a first electrode and a second electrode, and a first transistor that controls a current flowing in the light-emitting element;

a plurality of dummy unit circuits that are arranged in the non-light-emitting region, each dummy unit circuit having a second transistor; and

a current supply line that is wired to extend from a peripheral region to the element forming region and that is electrically connected to the first electrode via the first transistor in each of the unit circuits,

wherein the dummy unit circuits are connected to the current supply line.

11. The light-emitting device according to claim 9, further comprising:

a dummy-unit-circuit protective circuit that has protective elements provided between the dummy unit circuits and one of the plurality of power lines.

10. A light-emitting device in which, on a substrate, an element forming region has a light-emitting region and a non-light-emitting region formed in a periphery of the light-emitting region, the light-emitting device comprising:

a plurality of unit circuits that are arranged in the light-emitting region, each unit circuit having a light-emitting element that has a first electrode and a second electrode, and a first transistor that controls a current flowing in the light-emitting element;

a plurality of dummy unit circuits that are arranged in the non-light-emitting region, each dummy unit circuit having a second transistor;

a plurality of power lines that are wired in a peripheral region disposed in a periphery of the element forming region so as to supply power having different potentials to the unit circuits;

a current supply line that is wired to extend from the peripheral region to the element forming region and that is electrically connected to the first electrode via the first transistor in each of the unit circuits,

wherein the dummy unit circuits are connected to one of the plurality of power lines.

12. A light-emitting device comprising:

a plurality of unit circuits that are arranged in an element forming region on a substrate, each unit circuit having a light-emitting element that has a first electrode and a second electrode, and a transistor that controls a current flowing in the light-emitting element;

a first current supply line that is wired to extend from a peripheral region of the element forming region to the element forming region and that is electrically connected to the first electrode via the transistor;

a second current supply line that is wired to extend from the peripheral region to the element forming region and that is electrically connected to the second electrode;

data lines that are wired to extend from the peripheral region to the element forming region so as to supply data signals to the unit circuits; and

a data-line protective circuit that is provided in the peripheral region and that has first protective elements connected between the data lines and the first current supply line, and second protective elements connected between the data lines and the second current supply line,

wherein the second electrode is provided commonly to the plurality of unit circuits.