KR-20260062297-A - LIGHT EMITTING DISPLAY DEVICE WITH IMPROVED HEAT RADIATION

KR20260062297AKR 20260062297 AKR20260062297 AKR 20260062297AKR-20260062297-A

Abstract

The present disclosure relates to a light-emitting display device having a heat dissipation layer with a high emissivity disposed on the back surface of a display panel, the surface of an inner plate, and the back surface of an inner plate facing a lower frame, respectively, and a heat dissipation layer with a low emissivity disposed on the back surface of an inner plate corresponding to a driving circuit board. Heat generated from the display panel by driving is efficiently dissipated to the outside, and the transfer of heat generated from the driving circuit board to the display panel can be minimized.

Inventors

진상우
명노진

Assignees

엘지디스플레이 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (16)

Display panel; An inner plate spaced apart from the back surface of the above-mentioned display panel; A lower frame spaced apart from the back surface of the inner plate; and It includes a driving circuit board that corresponds to a first region on the back surface of the inner plate and is disposed between the inner plate and the lower frame, and A first heat dissipation layer is disposed on the back surface of the above-mentioned display panel, and A second heat dissipation layer is disposed on the surface of the inner plate facing the display panel, and A third heat dissipation layer is disposed on the back surface of the inner plate, and The third heat dissipation layer comprises a first region heat dissipation layer disposed corresponding to the driving circuit board and a second region heat dissipation layer disposed facing the lower frame. The first heat dissipation layer, the second heat dissipation layer, and the second region heat dissipation layer each comprise a material having an emissivity of 0.8 or higher and less than 1, and The above-mentioned first region heat dissipation layer comprises a material having an emissivity of 0.2 or higher and 0.5 or lower, in a light-emitting display device.
In Article 1, A light-emitting display device further comprising a fourth heat dissipation layer disposed on the surface of the lower frame.
In Paragraph 2, The above-mentioned fourth heat dissipation layer comprises a material having an emissivity of 0.8 or more and less than 1, in a light-emitting display device.
In Paragraph 2, A light-emitting display device further comprising a fifth heat dissipation layer disposed on the back surface of the lower frame.
In Paragraph 4, The above lower frame comprises a material having an emissivity of 0.2 or higher and 0.6 or lower, and The above-mentioned fifth heat dissipation layer comprises a material having an emissivity of 0.8 or more and less than 1, in a light-emitting display device.
In Paragraph 5, The above lower frame is a light-emitting display device comprising a metal material.
In Paragraph 6, The above metal material is a light-emitting display device selected from aluminum, zinc, tin, tungsten, iron, copper, cobalt, nickel, electro-galvanized steel (EGI), stainless steel, and combinations thereof.
In Paragraph 4, The above-mentioned fifth heat dissipation layer is a light-emitting display device comprising a polymer.
In Paragraph 8, The above polymer is a light-emitting display device selected from polydimethylsiloxane (PDMS), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polycarbonate (PC), polyurethane (PU), ethylene vinyl acetate copolymer (EVA), cellulose acetate, copolymers thereof, and combinations thereof.
In Article 1, A light-emitting display device having a surface of the inner plate having a plurality of convex portions protruding toward the display panel and a concave portion located between the plurality of convex portions.
In Article 1, A light-emitting display device having a surface of the lower frame having a plurality of convex portions protruding toward the inner plate and a concave portion located between the plurality of convex portions.
In Article 1, The above display panel and the above inner plate are spaced apart by a first air gap, and A light-emitting display device in which the inner plate and the lower frame are spaced apart by a second air gap.
In Article 1, A light-emitting display device comprising, respectively, a first heat dissipation layer, a second heat dissipation layer, and a second region heat dissipation layer, the first heat dissipation layer, the second heat dissipation layer, and the second region heat dissipation layer, each comprising a material selected from graphite, graphene, carbon nanotube (CNT), Formica, glass, iron, paint, acrylic resin, black resin, polypropylene, rubber, quartz, insulating tape, varnish, silicon nitride, carbon pigment, Inconel, and combinations thereof.
In Article 1, The above display panel is, A substrate having a pixel area, and A light-emitting display device including a light-emitting diode located on the upper surface of the above substrate.
In Article 14, The above display panel is a light-emitting display device further comprising a color filter layer located above the light-emitting diode.
In Article 1, The above inner plate is a light-emitting display device comprising a metal material.

Description

Light Emitting Display Device with Improved Heat Radiation The present disclosure relates to a light-emitting display device, and more specifically, to a light-emitting display device with improved light-emitting lifespan and durability by improving heat dissipation characteristics. With the development of large-area display devices, there is an increasing demand for flat display devices that occupy less space. As a type of flat display device, the technology of light-emitting display devices, including light-emitting diodes, is advancing rapidly. Light-emitting display devices can be classified into organic light-emitting display devices that use organic light-emitting materials and inorganic light-emitting display devices that use inorganic light-emitting materials. A light-emitting display device includes a display panel that implements an image and a driving circuit board that provides various signals to the display panel. When the light-emitting display device is driven, it is necessary to dissipate heat generated from the display panel and the driving circuit board to the outside. Methods have been proposed to dissipate heat generated from the display panel, etc., by introducing a hole structure or by placing a heat dissipation member with excellent thermal conductivity on the back of the display panel or on the surface and back of the driving circuit board. However, merely introducing heat dissipation components or holes is insufficient to efficiently release the heat generated by the light-emitting display device to the outside. As heat generated during the driving process fails to dissipate, the materials included in the display panel deteriorate, or the performance of components included in the driving circuit board deteriorates. Consequently, problems arise regarding the display quality of the light-emitting display device and reduced durability. FIG. 1 is a schematic exploded perspective view of a light-emitting display device according to a first embodiment of the present disclosure. FIG. 2 is a schematic circuit diagram of a light-emitting panel constituting a light-emitting display device according to the present disclosure. FIG. 3 is a schematic cross-sectional view of a light-emitting panel constituting a light-emitting display device according to the present disclosure. FIG. 4 is a schematic cross-sectional view of a light-emitting display device according to a first embodiment of the present disclosure. FIG. 5 is a schematic diagram showing that heat generated when a light-emitting display device according to the first embodiment of the present disclosure is driven is released toward the outside. FIG. 6 is a schematic cross-sectional view of a light-emitting display device according to a second embodiment of the present disclosure. FIG. 7 is a schematic diagram showing that heat generated when a light-emitting display device according to a second embodiment of the present disclosure is efficiently released toward the outside. FIG. 8 is a schematic cross-sectional view of a light-emitting display device according to a third embodiment of the present disclosure. FIG. 9 is a schematic cross-sectional view of a light-emitting display device according to a fourth embodiment of the present disclosure. FIG. 10 is a schematic cross-sectional view of a light-emitting display device according to a fifth embodiment of the present disclosure. FIG. 11 is a graph showing that, according to an embodiment of the present disclosure, when a heat dissipation layer with high emissivity is placed on the back surface of the display panel, the surface and back surface of the inner plate, and the surface of the lower frame, respectively, thermal energy in the form of radiation is transferred and cooling efficiency is improved. FIG. 12 is a graph showing that, according to an exemplary embodiment of the present disclosure, a heat dissipation layer with high emissivity is placed on the back surface of the display panel, the surface and back surface of the inner plate, and the surface of the lower frame, respectively, and an irregular pattern is applied to the surface of the inner plate or the surface of the lower frame, thereby further improving cooling efficiency. The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments and examples described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments and examples disclosed below but may be implemented in various different forms, and the embodiments and examples provided merely to make the present disclosure complete and to fully inform those skilled in the art of the scope of the invention. Shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments and examples of the present disclosure are exemplary and are not limited to the depicted matters. Throughout the specification, the