EP-4742870-A1 - DISPLAY DEVICE

Abstract

A display device according to an embodiment comprises: a substrate which includes a display area and a non-display area; a light-emitting element layer which is disposed on the display area and includes a pixel electrode, an organic light-emitting layer, and a common electrode; a circuit unit which is disposed on the non-display area and includes a plurality of circuit transistors; and a pixel-defining layer which extends from the display area to the circuit unit, wherein the pixel-defining layer includes a plurality of openings overlapping the circuit unit, and the plurality of openings do not overlap the plurality of circuit transistors.

Inventors

• SHIN, JAE MIN
• YOON, JOO SUN

Assignees

• Samsung Display Co., Ltd.

Dates

Publication Date

20260513

Application Date

20240124

Claims (20)

1. A display device comprising: a substrate comprising a display area and a non-display area; a light emitting element layer disposed on the display area and comprising a pixel electrode, an organic light emitting layer and a common electrode; a circuit part disposed on the non-display area and comprising a plurality of circuit transistors; and a pixel defining layer extending from the display area to the circuit part, wherein the pixel defining layer comprises a plurality of openings overlapping the circuit part, and the openings do not overlap the circuit transistors.
2. The display device of claim 1, wherein the pixel defining layer covers edges of the pixel electrode and comprises a black pigment or dye.
3. The display device of claim 1, wherein circuit transistors not overlapping the openings among the circuit transistors overlap the pixel defining layer.
4. The display device of claim 1, wherein a distance between any two adjacent openings among the openings is different from a distance between two other openings.
5. The display device of claim 1, wherein a distance between any two adjacent openings among the openings is greater than a distance between two other openings.
6. The display device of claim 1, wherein the circuit transistors comprise an oxide semiconductor.
7. The display device of claim 1, further comprising a via layer disposed on the display area and the non-display area and disposed between the substrate and the pixel defining layer, wherein the openings expose an upper surface of the via layer.
8. The display device of claim 1, wherein the common electrode extends from the display area to the circuit part and overlaps at least some of the circuit transistors.
9. A display device comprising: a substrate comprising a display area and a non-display area; a light emitting element layer disposed on the display area and comprising a pixel electrode, an organic light emitting layer and a common electrode; circuit parts disposed on the non-display area and comprising a plurality of circuit transistors; and a pixel defining layer extending from the display area to the circuit parts, wherein the common electrode extends from the display area to the circuit parts, the pixel defining layer comprises a plurality of openings overlapping the circuit parts, some of the circuit transistors overlap the common electrode, and the openings overlap at least some of the circuit transistors overlapping the common electrode and do not overlap circuit transistors not overlapping the common electrode.
10. The display device of claim 9, wherein the circuit parts comprise a first circuit part disposed adjacent to the display area and a second circuit part spaced farther apart from the display area than the first circuit part, wherein the first circuit part comprises a plurality of first circuit transistors, and the common electrode overlaps the first circuit transistors.
11. The display device of claim 10, wherein the second circuit part comprises (2-1)th circuit transistors adjacent to the first circuit part and (2-2)th circuit transistors disposed adjacent to an outer side of the substrate from the (2-1) th circuit transistors, and the common electrode overlaps the (2-1)th circuit transistors and does not overlap the (2-2)th circuit transistors.
12. The display device of claim 11, wherein the openings overlap at least some of the first circuit transistors and overlap at least some of the (2-1)-th circuit transistors.
13. The display device of claim 12, wherein the openings do not overlap the (2-2)th circuit transistors.
14. A display device comprising: a substrate comprising a display area and a non-display area; a light emitting element layer disposed on the display area and comprising a pixel electrode, an organic light emitting layer and a common electrode; circuit parts disposed on the non-display area and comprising a plurality of circuit transistors; and a pixel defining layer extending from the display area to the circuit parts and comprising a plurality of openings overlapping the circuit parts, wherein the openings overlap at least some of the circuit transistors and do not overlap the other circuit transistors.
15. The display device of claim 14, wherein the circuit parts comprise a first circuit part disposed adjacent to the display area and a second circuit part spaced farther apart from the display area than the first circuit part, wherein each of the first circuit part and the second circuit part comprises at least buffer transistors, and the buffer transistors do not overlap the openings.
16. The display device of claim 15, wherein each of the first circuit part and the second circuit part further comprises switching transistors, and at least some of the switching transistors overlap the openings, and the other switching transistors overlap the pixel defining layer.
17. The display device of claim 15, wherein the common electrode extends from the display area to the circuit parts, overlaps the first circuit part and the second circuit part, the buffer transistors disposed in the first circuit part overlap the common electrode, and at least some of the buffer transistors disposed in the second circuit part do not overlap the common electrode.
18. The display device of claim 14, wherein the circuit transistors comprise an oxide semiconductor.
19. The display device of claim 14, further comprising: a via layer disposed between the substrate and the pixel defining layer and covering the circuit transistors; and a connection line disposed between the pixel defining layer and the via layer and overlapping the circuit transistors.
20. The display device of claim 14, further comprising a thin-film encapsulation layer disposed on the light emitting element layer and extending from the display area to the non-display area, wherein the thin-film encapsulation layer overlaps the circuit transistors.

Description

[TECHNICAL FIELD] The present disclosure relates to a display device. [BACKGROUND ART] As the information society develops, demands for display devices for displaying images are increasing in various forms. For example, display devices are applied to various electronic devices such as smartphones, digital cameras, notebook computers, navigation devices, and smart televisions. The display devices may be flat panel display devices such as liquid crystal display devices, field emission display devices, and light emitting display devices. The light emitting display devices may include an organic light emitting display device including an organic light emitting element, an inorganic light emitting display device including an inorganic light emitting element such as an inorganic semiconductor, and an ultra-small light emitting display device including an ultra-small light emitting element. An organic light emitting element may include two electrodes facing each other and a light emitting layer interposed between them. The light emitting layer may receive electrons and holes from the two electrodes, recombine them to generate excitons, and emit light as the generated excitons change from an excited state to a ground state. [DISCLOSURE] [TECHNICAL PROBLEM] Aspects of the present disclosure provide a display device which can prevent reliability defects of a circuit part caused by external light. However, aspects of the present disclosure are not restricted to those set forth herein. The above and other aspects of the present disclosure will become more apparent to one of ordinary skill in the art to which the present disclosure pertains by referencing the detailed description of the present disclosure given below. [TECHNICAL SOLUTION] The first circuit part may comprise a plurality of first circuit transistors, and the common electrode overlaps the first circuit transistors. The second circuit part may comprise (2-1)th circuit transistors adjacent to the first circuit part and (2-2)th circuit transistors disposed adjacent to an outer side of the substrate from the (2-1)th circuit transistors, and the common electrode overlaps the (2-1)th circuit transistors and may not overlap the (2-2)th circuit transistors. The openings may overlap at least some of the first circuit transistors and overlap at least some of the (2-1)-th circuit transistors. The openings may not overlap the (2-2)th circuit transistors. According to an aspect of the present disclosure, a display device comprises a substrate comprising a display area and a non-display area, a light emitting element layer disposed on the display area and comprising a pixel electrode, an organic light emitting layer and a common electrode, circuit parts disposed on the non-display area and comprising a plurality of circuit transistors, and a pixel defining layer extending from the display area to the circuit parts and comprising a plurality of openings overlapping the circuit parts, wherein the openings overlap at least some of the circuit transistors and do not overlap the other circuit transistors. The circuit parts may comprise a first circuit part disposed adjacent to the display area and a second circuit part spaced farther apart from the display area than the first circuit part, wherein each of the first circuit part and the second circuit part may comprise at least buffer transistors, and the buffer transistors may not overlap the openings. Each of the first circuit part and the second circuit part may further comprise switching transistors, and at least some of the switching transistors may overlap the openings, and the other switching transistors may overlap the pixel defining layer. The common electrode may extend from the display area to the circuit parts, may overlap the first circuit part and the second circuit part, the buffer transistors disposed in the first circuit part may overlap the common electrode, and at least some of the buffer transistors disposed in the second circuit part may not overlap the common electrode. The circuit transistors may comprise an oxide semiconductor. The display device may further comprise a via layer disposed between the substrate and the pixel defining layer and covering the circuit transistors, and a connection line disposed between the pixel defining layer and the via layer and overlapping the circuit transistors. The display device may further comprise a thin-film encapsulation layer disposed on the light emitting element layer and extending from the display area to the non-display area, wherein the thin-film encapsulation layer may overlap the circuit transistors. Other features and embodiments may be apparent from the following detailed description and the drawings. [ADVANTAGEOUS EFFECTS] In a display device according to an embodiment, openings of a pixel defining layer do not overlap circuit transistors disposed in a circuit part in a non-display area. Therefore, the circuit transistors can be prevented from being de