US-12628480-B2 - Light emitting module with a redistribution circuit for reduced pad count and enhanced display quality

US12628480B2US 12628480 B2US12628480 B2US 12628480B2US-12628480-B2

Abstract

A light emitting module and a light emitting device including the light emitting module are provided. The light emitting module includes a circuit structure and a plurality of light emitting units. The circuit structure has a first side and a second side opposite to the first side. The circuit structure includes a plurality of first pads disposed on the first side and at least one second pad disposed on the second side. The first pads are electrically connected to the at least one second pad. The light emitting units are electrically connected to the first pads. The number of the first pads is more than the number of the at least one second pad.

Inventors

Jia-Yuan CHEN
Tsung-Han Tsai
Kuan-Feng LEE

Assignees

Innolux Corporation

Dates

Publication Date: 20260512
Application Date: 20220323
Priority Date: 20210420

Claims (9)

1 . A light emitting module, comprising: a circuit structure, comprising a first side and a second side opposite to the first side, and the circuit structure comprising: a plurality of first pads, disposed on the first side; at least one second pad, disposed on the second side, wherein the first pads are electrically connected to the at least one second pad; a plurality of third pads, disposed on the first side; a plurality of fourth pads, disposed on the second side, wherein the third pads are electrically connected to the corresponding fourth pads; a redistribution circuit layer, disposed between the plurality of first pads and the at least one second pad, wherein the redistribution circuit layer comprises: a first circuit layer, comprising a plurality of conductive vias, a first contact, and a first circuit, wherein each of the conductive vias and the first contact are electrically connected to the corresponding first pad through the first circuit; a second circuit layer, comprising a plurality of first transfer nodes, a plurality of second contacts, and a plurality of second circuits, wherein each of the first transfer nodes is electrically connected to the corresponding first contact, and the plurality of first transfer nodes are electrically connected to the corresponding second contact through the corresponding second circuit; a third circuit layer, comprising a plurality of second transfer nodes, a plurality of third contacts, a plurality of third circuits, a plurality of fourth contacts, and a plurality of fifth pads, wherein each of the second transfer nodes is electrically connected to the corresponding second contact, the plurality of second transfer nodes are electrically connected to the corresponding third contact through the corresponding third circuit, the plurality of fourth contacts are electrically connected to the plurality of fifth pads through the corresponding third circuit, and the plurality of fifth pads are electrically connected to the corresponding conductive vias; and a width of one of the plurality of first transfer nodes is greater than a width of one of the plurality of first pads, and the width of the one of the plurality of first transfer nodes is smaller than a width of one of the at least one second pad; and a plurality of light emitting units, electrically connected to the plurality of first pads, wherein a number of the plurality of first pads is greater than a number of the at least one second pad, wherein the plurality of fourth pads are electrical connected to the plurality of third pads through the corresponding fourth contacts and the corresponding conductive vias.
2 . The light emitting module according to claim 1 , wherein the plurality of first pads and the at least one second pad are configured to receive a common voltage.
3 . The light emitting module according to claim 1 , wherein an area of one of the at least one second pad is larger than an area of one of the plurality of first pads.
4 . The light emitting module according to claim 1 , wherein the plurality of first pads are electrically connected to the at least one second pad through the redistribution circuit layer.
5 . The light emitting module according to claim 4 , wherein a number of the plurality of first transfer nodes is greater than the number of the at least one second pad, and the number of the plurality of first transfer nodes is less than the number of the plurality of first pads.
6 . The light emitting module according to claim 1 , wherein a degree of dispersion of the plurality of fourth pads is greater than a degree of dispersion of the plurality of third pads.
7 . The light emitting module according to claim 1 , wherein the circuit structure further comprises a thin film transistor electrically connected to at least one of the plurality of light emitting units.
8 . A light emitting device, comprising: a driving substrate; and a plurality of the light emitting modules according to claim 1 , wherein each of the light emitting modules is electrically connected to the driving substrate through the at least one second pad.
9 . The light emitting module according to claim 1 , wherein a number of the plurality of third pads is equal to a number of the plurality of fourth pads.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the priority benefits of China application serial no. 202110424211.8, filed on Apr. 20, 2021. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. BACKGROUND Technical Field The embodiments of the present disclosure relates to a light emitting module and a light emitting device including thereof. Description of Related Art As applications of electronic devices continue to increase, the development of display technology also improves with each passing day. Given different application conditions, the requirement standards for the display quality of electronic devices also get higher, from where different problems of electronic devices arise accordingly. Therefore, the research and development of electronic devices must be met with continuous effort. SUMMARY According to the embodiments of the disclosure, the light emitting module includes a circuit structure and multiple light emitting units. A circuit structure includes a first side and a second side opposite to the first side. The circuit structure includes multiple first pads disposed on the first side and at least one second pad disposed on the second side, where the first pads are electrically connected to at least one second pad. The light emitting units are electrically connected to the first pads. The number of the first pads is greater than the number of at least one second pad. According to the embodiments of the disclosure, the light emitting device includes a driving substrate and multiple light emitting modules. Each of the light emitting modules is electrically connected to the driving substrate through at least one second pad. Based on the above, in the light emitting module or the light emitting device including the same in the embodiments of the present disclosure, since the pads on the second side of the circuit structure may be reconfigured or integrated through the redistribution circuit layer, the number of the pads on the second side of the circuit structure may be reduced, the risk of short circuit may be reduced, or the difficulty in bonding the light emitting module with the driving substrate may be reduced. The bonding quality of the light emitting module and the driving substrate may be improved. The light emitting device may have better bonding quality or display quality. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a schematic top view of a light emitting device according to an embodiment of the disclosure. FIG. 1B is a cross-sectional view of the light emitting device of FIG. 1A along a section line A-A′. FIG. 1C is a cross-sectional view of a light emitting device according to another embodiment of the disclosure. FIG. 2A is a schematic top view of a first circuit layer of a light emitting module according to an embodiment of the disclosure. FIG. 2B is a schematic top view of a second circuit layer of a light emitting module according to an embodiment of the disclosure. FIG. 2C is a schematic top view of a third circuit layer of a light emitting module according to an embodiment of the disclosure. FIG. 2D is a schematic bottom view of a third circuit layer of a light emitting module according to an embodiment of the disclosure. FIG. 3A is a schematic top view of a third circuit layer of a light emitting module according to another embodiment of the disclosure. FIG. 3B is a schematic top view of a third circuit layer of a light emitting module according to another embodiment of the disclosure. FIG. 3C is a schematic top view of a third circuit layer of a light emitting module according to another embodiment of the disclosure. FIG. 4 is a schematic top view of a third circuit layer of a light emitting module according to another embodiment of the disclosure. FIG. 5 is a schematic bottom view of a third circuit layer of a light emitting module according to another embodiment of the disclosure. FIG. 6A is a schematic top view of a light emitting module according to another embodiment of the disclosure. FIG. 6B is a cross-sectional view of the light emitting module of FIG. 6A along a section line B-B′. FIG. 7A is a schematic top view of a light emitting module according to another embodiment of the disclosure. FIG. 7B is a cross-sectional view of the light emitting module of FIG. 7A along a section line C-C′. FIG. 7C is a cross-sectional view of the light emitting module of FIG. 7A along a section line D-D′. FIG. 7D is a cross-sectional view of the light emitting module of FIG. 7A along a section line E-E′. FIG. 8A is a schematic top view of a light emitting module according to another embodiment of the disclosure. FIG. 8B is a cross-sectional view of the light emitting module of FIG. 7A along a section line F-F′. FIG. 9A is a schematic top view of one layer of a light emitting module according to another embodiment of the disclosure. FIG. 9B is a schematic bottom view of a light emitting