EP-4738062-A1 - DISPLAY DEVICE WITH IMPROVED HEAT RADIATION

EP4738062A1EP 4738062 A1EP4738062 A1EP 4738062A1EP-4738062-A1

Abstract

A display device includes a first type heat dissipation layer having a high emissivity disposed on a lower surface of a display panel, an upper surface of an inner plate and/or a lower surface of the inner plate facing to a lower frame, and a second type heat dissipation layer having a lower emissivity disposed on the lower surface of the inner plate corresponding to a driving circuit board. The heat generated in the display panel can be efficiently dissipated to an outside and heat generated in the driving circuit board can be minimized from being transferred to the display panel.

Inventors

JIN, SANG-WOO
MYUNG, NOH-JIN

Assignees

LG Display Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20250820

Claims (15)

A display device (100), comprising: a display panel (200) including a first surface at which an image is displayed and a second surface that is opposite the first surface; an inner plate (130) including a first surface that is spaced apart from the second surface of the display panel and a second surface; a lower frame (110) that is spaced apart from the second surface of the inner plate; a driving circuit board (140) that is between the second surface of the inner plate and the lower frame; a first heat dissipation layer (HR1) on the second surface of the display panel; a second heat dissipation layer (HR2) on the first surface of the inner plate such that the second heat dissipation layer is between the first heat dissipation layer and the first surface of the inner plate; and a third heat dissipation layer (HR3) disposed on the second surface of the inner plate, wherein the third heat dissipation layer includes a first area heat dissipation layer (LE) that overlaps the driving circuit board and a second area heat dissipation layer (HE) that is non-overlapping with the driving circuit board, wherein each of the first heat dissipation layer, the second heat dissipation layer, and the second area heat dissipation layer each includes a material having an emissivity of 0.8 or more and less than 1, and wherein the first area heat dissipation layer includes a material having an emissivity between 0.2 and 0.5.
The display device of claim 1, wherein the lower frame includes a first surface and a second surface that is opposite the first surface, and the display device further comprises: a fourth heat dissipation layer (HR4) on the first surface of the lower frame, wherein a portion of the fourth heat dissipation layer is between the first surface of the lower frame and the driving circuit board.
The display device of claim 2, wherein the fourth heat dissipation layer includes a material having an emissivity of 0.8 or more and less than 1.
The display device of claim 2 or 3, wherein the display device further comprises: a fifth heat dissipation layer (HR5) on the second surface of the lower frame.
The display device of claim 4, wherein the lower frame includes a material having an emissivity between 0.2 and 0.6.
The display device of claim 5, wherein the fifth heat dissipation layer includes a material having an emissivity of 0.8 or more and less than 1.
The display device of claim 5, wherein a metal component of the first area heat dissipation layer and/or lower frame comprises one of aluminum, zinc, tin, tungsten, iron, steel, copper, cobalt, nickel, electrogalvanized iron "EGI", stainless steel, or combinations thereof.
The display device of claim 5, 6 or 7, wherein the fifth heat dissipation layer includes a polymer, and optionally wherein the polymer is one of polydimethyl siloxane "PDMS", polymethyl methacrylate "PMMA", polyethylene terephthalate "PET", polycarbonate "PC", polyurethane "PU", ethylene-vinyl acetate copolymer "EVA", cellulose acetate, copolymers thereof, or combinations thereof.
The display device of any preceding claim, wherein the first surface of the inner plate includes a plurality of convex portions protruding toward the display panel and a plurality of concave portions positioned between the plurality of convex portions that protrude away from the display panel.
The display device of claim 9, wherein each of the plurality of convex portions and the plurality of concave portions located on the first surface of the inner plate has a corrugated structure.
The display device of claim 1, wherein the lower frame includes a first surface and a second surface that is opposite the first surface, and the first surface of the lower frame includes a plurality of convex portions protruding toward the inner plate and a plurality of concave portions positioned between the plurality of convex portions and protrude away from the inner plate.
The display device of claim 11, wherein each of the plurality of convex portions and the plurality of concave portions located on the first surface of the lower frame has a corrugated structure.
The display device of claim 12, wherein the display device further comprises: a fourth heat-dissipation layer (HR4) on the first surface of the lower frame, wherein the fourth heat-dissipation layer (HR) has an uneven shape corresponding to the plurality of convex portions and the plurality of concave portions.
The display device of any preceding claim, wherein the display panel is spaced apart from the inner plate with a first air gap (AG1) between the display panel and the inner plate, and the inner plate is spaced part from the lower frame with a second air gap (AG2) between the inner plate and the lower frame.
The display device of any preceding claim, wherein each of the first heat dissipation layer, the second heat dissipation layer, and the second area heat dissipation layer includes graphite, graphene, carbon nanotube "CNT", formica, glass, iron, paint, an acryl-containing resin, a black resin, polypropylene, rubber, quartz, an insulating tape, a varnish, silicon nitride, a carbon pigment, Inconel, or combinations thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to the Republic of Korea Patent Application No. 10-2024-0149182, filed on October 29, 2024. BACKGROUND Technical Field The present disclosure relates to a display device, and more particularly to, a display device with beneficial heat dissipation property, luminous lifespan, and durability. Discussion of Related Art As large-area display devices have been developed, demands for flat display devices with small space occupancy has been increasing. As one of the flat display devices, technologies of light-emitting display devices including a light-emitting diode has been developing rapidly. The light-emitting display device can be divided into an organic light-emitting display device using organic light-emitting materials and an inorganic light-emitting display device using inorganic luminous materials. The light-emitting display device includes a display panel implementing images and a driving circuit board providing various signals to the display panel. When the light-emitting display device is operated, it is necessary to release heat generated from the display panel and the driving circuit board to the outside. A method of introducing a hole structure to release heat generated from the display panel to outside of the display device, or placing a heat dissipation member with excellent heat conductivity on a lower surface of the display panel or on an upper surface and a lower surface of the driving circuit board has been proposed. However, simply introducing a heat dissipation member or a hole structure does not efficiently release the heat generated from the light-emitting display device to the outside. Since the heat generated during the driving process is not released to the outside, the materials included in the display panel deteriorate or the performance of the components included in the driving circuit board deteriorate. As a result, the image quality of the light-emitting display device deteriorates and durability of the device decreases. SUMMARY Accordingly, some embodiments of the present disclosure are directed to a display device that substantially obviates one or more of the problems due to the limitations and disadvantages of the related art. An embodiment of the present disclosure is to provide a display device that can release efficiently heat generated in the course of driving process to the outside. Another embodiment of the present disclosure is to provide a display device that can improve an image quality and durability by minimizing or at least reducing deterioration of the luminous materials and components. Additional features and aspects will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the disclosed concepts provided herein. Other features and aspects of the disclosed concept can be realized and attained by the structure particularly pointed out in the written description, or derivable therefrom, and the claims as well as the appended drawings. To achieve these and other embodiments of the inventive concepts, as embodied and broadly described, the present disclosure provides a display device that comprises: a display panel including a first surface at which an image is displayed and a second surface that is opposite the first surface; an inner plate including a first surface that is spaced apart from the second surface of the display panel and a second surface; a lower frame that is spaced apart from the second surface of the inner plate; a driving circuit board that is between the second surface of the inner plate and the lower frame; a first heat dissipation layer on the second surface of the display panel; a second heat dissipation layer on the first surface of the inner plate such that the second heat dissipation layer is between the first heat dissipation layer and the first surface of the inner plate; and a third heat dissipation layer disposed on the second surface of the inner plate, wherein the third heat dissipation layer includes a first area heat dissipation layer that overlaps the driving circuit board and a second area heat dissipation layer that is non-overlapping with the driving circuit board, wherein each of the first heat dissipation layer, the second heat dissipation layer, and the second area heat dissipation layer each includes a material having an emissivity between 0.8 and less than 1, and wherein the first area heat dissipation layer includes a material having an emissivity between 0.2 and 0.5. In one embodiment, a display device comprises: a display panel including a first surface at which an image is displayed and a second surface that is opposite the first surface; a plate including a first surface that is spaced apart from the second surface of the display panel by a first airgap and a second surface; a frame that is spaced apart from the second surface of the plate; a driving circuit board that is be