KR-102962638-B1 - ELECTROLUMINESCENT DEVICE

KR102962638B1KR 102962638 B1KR102962638 B1KR 102962638B1KR-102962638-B1

Abstract

An electroluminescent device is disclosed. The electroluminescent device comprises an image sensor structure, a first light-blocking structure, a first insulating film, and an electroluminescent structure that are sequentially stacked. The electroluminescent structure comprises lower electrodes, light-emitting films located on the lower electrodes, and upper electrodes located on the light-emitting films. The first light-blocking structure has effective pinholes. The image sensor structure includes effective image sensors that overlap with the effective pinholes of the first light-blocking structure. The lower electrodes may not overlap with the effective pinholes of the first light-blocking structure. Accordingly, the electroluminescent device may have a fingerprint recognition function of excellent performance.

Inventors

박명서

Assignees

삼성디스플레이 주식회사

Dates

Publication Date: 20260511
Application Date: 20250730

Claims (20)

An electroluminescent structure comprising lower electrodes, light-emitting films located above the lower electrodes, and upper electrodes located above the light-emitting films; A light-blocking structure located below the above-mentioned electroluminescent structure and having effective pinholes that do not overlap with the lower electrodes; Image sensors located below the light-blocking structure and overlapping with the effective pinholes; and An electroluminescent device comprising a touch sensing structure located on the electroluminescent structure and not overlapping with the effective pinholes.
In Article 1, The above-described touch sensing structure includes touch sensing electrodes and bridges that electrically connect the touch sensing electrodes, and The above-described electroluminescent structure includes light-emitting regions in which light is emitted when the lower electrodes, the light-emitting films, and the upper electrodes are all overlapped. An electroluminescent device having at least one of the touch sensing electrode and the bridges having a hole overlapping with the light-emitting regions.
In Article 1, The above-mentioned light-blocking structure further includes dummy pinholes, and The above dummy pinhole is located between the above effective pinholes, and An electroluminescent device in which the above effective pinholes and the above dummy pinholes together form a single grid array in a planar manner.
In Article 1, The above-mentioned shading structure is, A first shading structure including first effective pinholes and first dummy pinholes; and A second light-blocking structure is positioned between the first light-blocking structure and the image sensors and includes a second light-blocking area and second effective pinholes. The above second light-blocking area does not overlap with the above first effective pinholes and blocks light passing through the first dummy pinholes, and The above second effective pinholes overlap with the above first effective pinholes and form the effective pinholes in an electroluminescent device.
In Article 1, The above-mentioned shading structure is, A first light-blocking structure including first effective pinholes; and A second light-blocking structure is positioned between the first light-blocking structure and the image sensors and includes a second light-blocking area and second effective pinholes. The second light-blocking area above does not overlap with the first effective pinholes, and The above second effective pinholes overlap with the above first effective pinholes and form the effective pinholes in an electroluminescent device.
In Article 1, An electroluminescent device in which the shortest planar distance from the optical center of one of the effective pinholes to the lower electrodes is greater than the shortest planar distance measured in the direction in which the shortest planar distance from the optical center of one of the effective pinholes to the inner wall of one of the effective pinholes is measured.
In Article 6, The above-mentioned lower electrodes comprise a single first lower electrode that is planarally closest to the optical center of one of the effective pinholes and a single second lower electrode that is planarly closest to the optical center of one of the effective pinholes.
In Article 7, An electroluminescent device in which the shortest planar distance from the optical center of one of the effective pinholes to the first lower electrode is measured in a first direction, the shortest planar distance from the optical center of one of the effective pinholes to the second lower electrode is measured in a second direction, and the angle formed by the first and second directions is not k × 180°, and k is a non-zero integer.
In Article 6, The above-mentioned lower electrodes comprise a single first lower electrode that is planarally closest to the optical center of one of the effective pinholes and at least two second lower electrodes that are planarally closest to the optical center of one of the effective pinholes.
In Article 6, The above-mentioned lower electrodes are an electroluminescent device comprising at least two first lower electrodes that are planarly closest to the optical center of one of the effective pinholes.
In Article 6, Insulating film on which the above lower electrodes are located; A pixel defining film positioned on the insulating film to cover the edges of the lower electrodes; and It further includes spacers positioned on the pixel definition film to have a height greater than that of the pixel definition film, and An electroluminescent device in which the shortest planar distance from one of the effective pinholes to the spacers is greater than the shortest planar distance from one of the effective pinholes to the lower electrodes.
In Article 11, The above-described touch sensing structure includes touch sensing electrodes and bridges, and The above bridges electrically connect two adjacent touch sensing electrodes, and An electroluminescent device in which the shortest planar distance from one of the effective pinholes to the bridges is greater than the shortest planar distance from one of the effective pinholes to the spacers.
In Article 1, Insulating film on which the above lower electrodes are located; A pixel defining film positioned on the insulating film to cover the edges of the lower electrodes; and It includes spacers positioned on the pixel definition film to have a height greater than that of the pixel definition film, and An electroluminescent device in which the shortest planar distance from the optical center of one of the effective pinholes to the spacers is greater than the planar distance measured in the direction in which the shortest planar distance from the optical center of one of the effective pinholes to the inner wall of one of the effective pinholes is measured.
In Article 13, The above spacers comprise a single first spacer that is planarally closest to the optical center of one of the effective pinholes and a single second spacer that is planarally closest to the optical center of one of the effective pinholes.
In Article 14, An electroluminescent device in which the shortest planar distance from the optical center of one of the effective pinholes to the first spacer is measured along a third direction, the shortest planar distance from the optical center of one of the effective pinholes to the second spacer is measured along a fourth direction, the third and fourth directions form a second angle, the second angle is not m × 180°, and m is a non-zero integer.
In Article 13, The above spacers are an electroluminescent device having a single first spacer that is planarally closest to the optical center of one of the effective pinholes and at least two second spacers that are planarally closest to the optical center of one of the effective pinholes.
In Article 13, The above spacers are an electroluminescent device having at least two first spacers that are planarly closest to the optical center of one of the effective pinholes.
In Article 13, The above touch sensing structure has touch sensing electrodes and bridges, Each of the above bridges electrically connects two adjacent touch sensing electrodes, and An electroluminescent device in which the shortest planar distance from one of the effective pinholes to the bridges is greater than the shortest planar distance from one of the effective pinholes to the spacers.
In Article 1, The above touch sensing structure has touch sensing electrodes and bridges, Each of the above bridges electrically connects two adjacent touch sensing electrodes, and An electroluminescent device in which the shortest planar distance from the optical center of any one of the effective pinholes to the bridges is greater than the planar distance measured in the direction in which the shortest planar distance from the optical center of one of the effective pinholes to the inner wall of one of the effective pinholes is measured.
In Article 19, The above bridges are an electroluminescent device comprising a single first bridge that is planarally closest to the optical center of one of the effective pinholes and a single second bridge that is planarally closest to the optical center of one of the effective pinholes.

Description

Electroluminescent Device The present invention relates to an electroluminescent device. More specifically, the present invention relates to an electroluminescent device including a fingerprint sensor. Electroluminescent devices utilize self-emitting light-emitting diodes, offering advantages such as fast response speed, high luminous efficiency, brightness, and viewing angle. Recently, as electroluminescent devices such as smartphones and tablet PCs are being utilized in various fields, biometric authentication methods using user fingerprints are being widely used. To provide fingerprint sensing capabilities, a fingerprint sensor can be provided by being embedded in or attached to the electroluminescent device. A fingerprint sensor may be composed of, for example, a light-sensing sensor. A light-sensing fingerprint sensor may include a light source, a lens, and a light sensor array. If such a fingerprint sensor is attached to a light-emitting panel, the thickness of the electroluminescent device may increase and manufacturing costs may rise. FIGS. 1a and FIGS. 1b are plan views for illustrating an electroluminescent device according to embodiments of the present invention. FIG. 2 is a cross-sectional view of an electroluminescent device shown in FIG. 1a or FIG. 1b according to one embodiment of the present invention. FIG. 3 is a plan view of the light-shielding structure of FIG. 2 according to one embodiment of the present invention. FIG. 4 is a plan view of an electroluminescent device including the light-shielding structure of FIG. 2 according to one embodiment of the present invention. FIGS. 5a to 5d are plan views illustrating the arrangement of pixel circuits, pinholes, and image sensors according to embodiments of the present invention. FIG. 6 is a cross-sectional view of an electroluminescent device shown in FIG. 1a or FIG. 1b according to one embodiment of the present invention. Figure 7 is a plan view of the touch sensing structure shown in Figure 2. FIG. 8a is an enlarged plan view of the EA1 portion of FIG. 7. FIG. 8b is a cross-sectional view taken along line I-I' of FIG. 8a according to embodiments of the present invention. FIG. 8c is a cross-sectional view taken along line I-I' of FIG. 8a according to one embodiment of the present invention. FIG. 8d is an enlarged plan view of the EA2 portion of FIG. 8a. FIG. 9a is a cross-sectional view for explaining an electroluminescent device illustrated in FIG. 6 according to one embodiment of the present invention. Fig. 9b is an enlarged cross-sectional view of the EA3 portion of Fig. 9a. FIG. 9c is an enlarged cross-sectional view of the EA4 portion of FIG. 9a. FIG. 10 is a cross-sectional view illustrating an electroluminescent device illustrated in FIG. 6 according to one embodiment of the present invention. FIG. 11 is a cross-sectional view for explaining an electroluminescent device illustrated in FIG. 6 according to one embodiment of the present invention. FIG. 12 is a cross-sectional view for explaining the electroluminescent device illustrated in FIG. 6 according to one embodiment of the present invention. FIG. 13 is a cross-sectional view for explaining an electroluminescent device illustrated in FIG. 6 according to one embodiment of the present invention. FIG. 14 is a cross-sectional view for explaining the electroluminescent device illustrated in FIG. 6 according to one embodiment of the present invention. FIG. 15 is a cross-sectional view illustrating an electroluminescent device illustrated in FIG. 6 according to one embodiment of the present invention. FIG. 16 is a cross-sectional view for explaining an electroluminescent device illustrated in FIG. 6 according to one embodiment of the present invention. FIG. 17 is a cross-sectional view illustrating an electroluminescent device illustrated in FIG. 6 according to one embodiment of the present invention. FIG. 18 is a plan view for explaining an electroluminescent device illustrated in FIG. 17 according to one embodiment of the present invention. FIG. 19 is a plan view illustrating the positional relationship of effective pinholes, lower electrodes, spacers, and bridges according to embodiments of the present invention. FIG. 20 is a plan view illustrating the positional relationship of effective pinholes, lower electrodes, spacers, and bridges according to embodiments of the present invention. FIG. 21 is a circuit diagram for explaining a pixel circuit illustrated in FIG. 1a or FIG. 1b according to embodiments of the present invention. FIG. 22 is a plan view for explaining the pixel illustrated in FIG. 21 according to embodiments of the present invention. FIG. 23 is a cross-sectional view taken along the line II-II' of FIG. 22. FIG. 24 is a plan view for explaining the pixel illustrated in FIG. 21 according to embodiments of the present invention. The present invention is capable of various modifications and may take various forms, and specific embodiments are illustrated in the drawings and