US-12622063-B2 - Display device

US12622063B2US 12622063 B2US12622063 B2US 12622063B2US-12622063-B2

Abstract

A display device includes: a plurality of pad electrodes disposed in a non-display area of a substrate of at least one display panel; a plurality of routing electrodes formed along a top surface, a lateral surface and a rear surface of a side portion of the substrate, respectively connected to the plurality of pad electrodes to transmit corresponding driving signals, and containing Ag paste; a conductive pattern surrounding the routing electrode; and a boost circuit that outputs an output voltage obtained by boosting a DC input voltage to the conductive pattern, wherein the output voltage has a higher potential than that of the driving signal.

Inventors

Won-Jun Choi
Hyun-woo Kim

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20230710
Priority Date: 20221230

Claims (20)

1 . A display device, comprising: a plurality of pad electrodes disposed in a non-display area of a substrate of at least one display panel; a plurality of routing electrodes formed along a top surface, a lateral surface and a rear surface of a side portion of the substrate, respectively connected to the plurality of pad electrodes to transmit corresponding driving signals, and containing Ag paste, a width of one of the routing electrodes being same as or greater than a width of a corresponding one of the pad electrodes in a plan view of the display panel; a conductive pattern surrounding one or more of the routing electrodes; and a boost circuit that outputs an output voltage obtained by boosting a direct current (DC) input voltage, the output voltage having a higher potential than that of the driving signals and being output to the conductive pattern.
2 . The display device of claim 1 , wherein the plurality of pad electrodes include a first clock pad electrode receiving a first clock signal and a data pad electrode receiving a data signal, and wherein the output voltage has a higher potential than that of the first clock signal.
3 . The display device of claim 2 , wherein the boost circuit includes: a first transistor having a diode connection structure and receiving the input voltage; a second transistor having a diode connection structure and connected in series with the first transistor with a first node interposed therebetween; and a first capacitor connected between the first node and the first clock pad electrode.
4 . The display device of claim 3 , wherein the plurality of pad electrodes further include a second clock pad electrode receiving a second clock signal which has a phase different from that of the first clock signal, wherein the boost circuit further includes a third transistor having a diode connection structure and connected in series with the second transistor with a second node interposed therebetween, and a second capacitor connected between the second node and the second clock pad electrode.
5 . The display device of claim 3 , wherein semiconductor layers of the first and second transistors are integrally formed, and branch off from and extend from the conductive pattern.
6 . The display device of claim 1 , wherein the conductive pattern includes: first pattern portions disposed on both sides in a width direction of the routing electrodes electrode; and a second pattern portion connected to the first pattern portions and disposed on a front side in a length direction of the routing electrodes electrode.
7 . The display device of claim 1 , further comprising a driving circuit disposed on a rear surface of the substrate and connected to the routing electrodes electrode, the driving circuit electrically connected to the pad electrodes via the routing electrodes electrode.
8 . The display device of claim 1 , wherein the at least one display panel includes a plurality of display panels arranged in a tiling manner, and wherein the routing electrodes electrode of the at least one display panel of the plurality of display panels is disposed at the side portion of the substrate adjacent to a neighboring display panel of the plurality of display panels.
9 . A display device, comprising: a plurality of pad electrodes disposed in a non-display area of a substrate of at least one display panel; and a plurality of routing electrodes formed along a top surface, a lateral surface and a rear surface of a side portion of the substrate, respectively connected to the plurality of pad electrodes to transmit corresponding driving signals, and containing Ag paste, wherein at least one of the pad electrodes includes an extension portion extending beyond a contour of a corresponding routing electrode on which the at least one of the pad electrodes is disposed and surrounding the corresponding routing electrode.
10 . The display device of claim 9 , wherein a width of the extension portion is equal to or more than ½ times a width of the corresponding routing electrode.
11 . The display device of claim 9 , wherein further comprising a driving circuit disposed on a rear surface of the substrate and connected to the routing electrodes electrode, the driving circuit electrically connected to the pad electrodes via the routing electrodes electrode.
12 . The display device of claim 9 , wherein the at least one display panel includes a plurality of display panels arranged in a tiling manner, and wherein the routing electrodes electrode of the at least one display panel of the plurality of display panels is disposed at the side portion of the substrate adjacent to a neighboring display panel of the plurality of display panels.
13 . A display device including one or more display panels, at least one of the display panels comprising: a plurality of pad electrodes disposed in a non-display area of a substrate of the at least one of the display panels; a driving circuit disposed on the substrate; a plurality of routing electrodes each electrically connecting a corresponding one of the pad electrodes to the driving circuit, a width of one of the routing electrodes being same as or greater than a width of a corresponding one of the pad electrodes in a plan view of the display panel; and a plurality of conductive patterns each surrounding at least a part of a corresponding one of the routing electrodes, wherein a first voltage is applied to a first one of the conductive patterns; wherein a second voltage is applied to a first one of the routing electrodes corresponding to and surrounded by the first one of the conductive patterns; and wherein the first voltage is higher than the second voltage.
14 . The display device of claim 13 , wherein: the driving circuit is disposed on a rear surface of the substrate; and the first one of the routing electrodes is disposed along a top surface, a side surface, and the rear surface of the substrate.
15 . The display device of claim 13 , wherein the routing electrodes comprise silver (Ag) paste.
16 . The display device of claim 13 , wherein the first one of the conductive patterns includes: first pattern portions disposed on both sides in a width direction of the first one of the routing electrodes; and a second pattern portion connected to the first pattern portions and disposed on a front side in a length direction of the first one of the routing electrodes.
17 . The display device of claim 13 , further comprising a boost circuit that receives a direct current (DC) input voltage and outputs the first voltage obtained by boosting the DC input voltage.
18 . The display device of claim 17 , wherein: the plurality of pad electrodes include a first clock pad electrode receiving a first clock signal and a data pad electrode receiving a data signal, and the first voltage has a higher potential than that of the first clock signal.
19 . The display device of claim 18 , wherein the boost circuit includes: a first transistor having a diode connection structure and receiving the DC input voltage; a second transistor having a diode connection structure and connected in series with the first transistor with a first node interposed therebetween; and a first capacitor connected between the first node and the first clock pad electrode.
20 . The display device of claim 19 , wherein semiconductor layers of the first and second transistors are integrally formed, and branch off and extend from, the first one of the conductive patterns.

Description

CROSS REFERENCE TO RELATED APPLICATIONS The present application claims the priority benefit of Korean Patent Application No. 10-2022-0190045 filed in Republic of Korea on Dec. 30, 2022, which is hereby incorporated by reference in its entirety for all purposes as if fully set forth herein. BACKGROUND Field of the Invention The present invention relates to a display device, and specifically, to a display device that can prevent ionization migration of routing electrodes to prevent open defect. Discussion of the Related Art Recently, a flat panel display device having excellent characteristics such as thinness, light weight, and low power consumption has been widely developed and applied to various fields. As such the flat panel display device, a liquid crystal display device, a light emitting display device, and the like can be used. As the light emitting display device, an organic light emitting display device having an organic light emitting diode, an LED display device having a micro-sized light emitting diode formed of an inorganic material, and the like can be used. Recently, in order to realize a large-area display device, a plurality of small display panels may be arranged in a tiling method. In such a tiling type display device, a bezel of a display panel is formed with a very small width so that a user cannot recognize a connection portion between adjacent display panels. As such, since the bezel of the display panel is very small, a side routing method of using Ag (silver) paste as a routing electrode along a side portion of the substrate is used to connect a pad electrode on the substrate of the display panel to a driving circuit on a back of the substrate. In this case, a migration defect may occur in which the Ag routing electrode on the pad electrode moves due to a potential difference with an electrode or wiring inside the display panel, and thus the pad electrode and the routing electrode may become electrically open, thereby preventing signals from being normally transmitted from the driving circuit to the pad electrode via the Ag routing electrode. SUMMARY Accordingly, the present invention is directed to a display device that substantially obviates one or more of the problems due to limitations and disadvantages of the related art. An advantage of the present invention is to provide a display device which can relieve or improve a migration defect of an Ag routing electrode in a display panel of a tiling type display device. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. These and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, a display device includes: a plurality of pad electrodes disposed in a non-display area of a substrate of at least one display panel; a plurality of routing electrodes formed along a top surface, a lateral surface and a rear surface of a side portion of the substrate, respectively connected to the plurality of pad electrodes to transmit corresponding driving signals, and containing Ag paste; a conductive pattern surrounding one or more of the routing electrodes; and a boost circuit that outputs an output voltage obtained by boosting a DC input voltage, the output voltage having a higher potential than that of the driving signals and being output to the conductive pattern. In another embodiment, a display device comprises a plurality of pad electrodes disposed in a non-display area of a substrate of at least one display panel; and a plurality of routing electrodes formed along a top surface, a lateral surface and a rear surface of a side portion of the substrate, respectively connected to the plurality of pad electrodes to transmit corresponding driving signals, and containing Ag paste, wherein at least one of the pad electrodes includes an extension portion extending beyond a contour of the corresponding routing electrode on which the at least one of the pad electrodes is disposed and surrounding the corresponding routing electrode. In still another embodiment, a display device includes one or more display panels, at least one of the display panels comprising: a plurality of pad electrodes disposed in a non-display area of a substrate of the at least one of the display panels; a driving circuit disposed on the substrate; a plurality of routing electrodes each electrically connecting a corresponding one of the pad electrodes to the driving circuit; and a plurality of conductive patterns each surrounding at least a part of a corresponding one of the routing electrodes, wherein a first voltage is applied to a first one of the conductive pattern