US-12628486-B2 - LED display apparatus having micro LED module

US12628486B2US 12628486 B2US12628486 B2US 12628486B2US-12628486-B2

Abstract

A display apparatus is provided. The display apparatus includes a display substrate, a first micro LED module disposed on the display substrate, and a second micro LED module disposed on the display substrate and adjacent to the first micro LED module. The first micro LED module and the second micro LED module have side surfaces facing each other. The side surfaces facing each other of the first micro LED module and the second micro LED module are inclined in an identical direction with respect to an upper surface of the display substrate.

Inventors

Dae Sung Cho
So Ra LEE

Assignees

SEOUL VIOSYS CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20240216

Claims (20)

1 . A light emitting display module, comprising: a first LED module including an upper surface, a lower surface, and a first side surface disposed between the upper surface and the lower surface; and a second LED module including an upper surface, a lower surface, and a second side surface disposed between the upper surface and the lower surface, wherein the first side surface is inclined with respect to the upper surface of the first LED module, wherein the second side surface is inclined with respect to the upper surface of the second LED module and faces to the first side surface, wherein the upper surface of the first LED module includes a lateral width that is different from a lateral width of the lower surface of the first LED module, wherein the upper surface of the second LED module includes a lateral width that is different from a lateral width of the lower surface of the second LED module, and wherein an entirety of a gap region from the first side surface to the second side surface is occupied by an empty space.
2 . The light emitting display module of claim 1 , wherein the lateral width of the upper surface of the first LED module is smaller than the width of the lower surface of the first LED module.
3 . The light emitting display module of claim 1 , wherein the lateral width of the lower surface of the second LED module is smaller than the width of the upper surface of the second LED module.
4 . The light emitting display module of claim 1 , wherein the first side surface and the second side surface are inclined in an identical direction.
5 . The light emitting display module of claim 1 , wherein the first side surface and the second side surface are inclined in a different direction.
6 . The light emitting display module of claim 2 , wherein the lower surface of the first LED module has an area that is larger than an area of the upper surface of the first LED module.
7 . The light emitting display module of claim 3 , wherein upper surface of the second LED module has an area that is larger than an area of the lower surface of the second LED module.
8 . The light emitting display module of claim 1 , wherein the first LED module includes a light emitter having a light emitting region, and wherein the light emitting region is 10000 μm2 or less.
9 . The light emitting display module of claim 1 , further comprising a molding layer disposed between the first side surface and the second side surface.
10 . A light emitting display module, comprising: a first LED module including an upper surface, a lower surface, and a first side surface disposed between the upper surface and the lower surface; and a second LED module including an upper surface, a lower surface, and a second side surface disposed between the upper surface and the lower surface, wherein the first LED module includes at least one light emitter having a light emitting region, wherein the first side surface is inclined with respect to the upper surface of the first LED module, wherein the second side surface is inclined with respect to the upper surface of the second LED module and faces to the first side surface, wherein the upper surface of the first LED module includes a lateral width that is different from a lateral width of the lower surface of the first LED module, wherein the light emitting region is 10000 μm 2 or less, and wherein an entirety of a gap region from the first side surface to the second side surface is occupied by an empty space.
11 . The light emitting display module of claim 10 , wherein the lateral width of the lower surface of the first LED module is smaller than the width of the upper surface of the first LED module.
12 . The light emitting display module of claim 10 , wherein a vertical width of the upper surface of the first LED module is substantially the same as a vertical width of the lower surface of the first LED module.
13 . The light emitting display module of claim 11 , wherein an area of the upper surface of the first LED module is different from an area of the lower surface of the first LED module.
14 . The light emitting display module of claim 10 , wherein the first side surface and the second side surface are inclined in an identical direction.
15 . The light emitting display module of claim 10 , further comprising a molding layer disposed between the first side surface and the second side surface.
16 . A light emitting display module, comprising: a first LED module including an upper surface, a lower surface, and a first side surface disposed between the upper surface and the lower surface; and a second LED module including an upper surface, a lower surface, and a second side surface disposed between the upper surface and the lower surface, wherein the second LED module includes at least one light emitter having a light emitting region, wherein the first side surface is inclined with respect to the upper surface of the first LED module, wherein the second side surface is inclined with respect to the upper surface of the second LED module and faces to the first side surface, wherein the upper surface of the second LED module includes a lateral width that is different from a lateral width of the lower surface of the second LED module, wherein the light emitting region is 10000 μm 2 or less, and wherein an entirety of a gap region from the first side surface to the second side surface is occupied by an empty space.
17 . The light emitting display module of claim 16 , wherein a vertical width of the upper surface of the second LED module is substantially the same as a vertical width of the lower surface of the second LED module.
18 . The light emitting display module of claim 16 , wherein an area of the upper surface of the second LED module is different from an area of the lower surface of the second LED module.
19 . The light emitting display module of claim 16 , wherein the first side surface and the second side surface are inclined in an identical direction.
20 . The light emitting display module of claim 16 , further comprising a molding layer disposed between the first side surface and the second side surface.

Description

CROSS-REFERENCE OF RELATED APPLICATIONS AND PRIORITY The present application is a continuation Application of U.S. application Ser. No. 17/152,303, filed Jan. 19, 2021, which is a Non-provisional Application which claims priority to the benefit of U.S. Provisional Application Nos. 62/963,781 filed Jan. 21, 2020, and 63/036,698 filed Jun. 9, 2020, the disclosures of which are incorporated by reference their entirety. TECHNICAL FIELD The present disclosure relates to an LED display apparatus, and more particularly, to an LED display apparatus having tile-shaped micro LED modules. BACKGROUND As an inorganic light source, light emitting diodes are for use in various fields including displays, vehicular lamps, general lighting, and the like. With various advantages such as long lifespan, low power consumption, and rapid response, light emitting diodes have been replacing existing light sources. For example, a display apparatus realizes various colors through mixture of blue, green and red light. In order to realize various images, the display apparatus includes a plurality of pixels, each of which has subpixels corresponding to blue, green and red light, respectively. A color of a certain pixel is determined based on the colors of the sub-pixels so that images can be realized through combination of such pixels. Light emitting diodes have been used as backlight light sources in display apparatuses. However, LED displays may directly realize images using the light emitting diodes. As LEDs can emit various colors depending upon materials thereof, it is possible to provide a display apparatus by arranging individual LED chips emitting blue, green and red light on a two-dimensional plane. However, when one LED chip is arranged in each sub-pixel, the number of LED chips may be increased, which may require excessive time for a mounting process during manufacture. Accordingly, stacked light emitting devices may reduce the time required for the mounting process. For example, by manufacturing a light emitting device in which a red LED, a blue LED, and a green LED are stacked, red, blue, and green light may be implemented using one light emitting device. Accordingly, one pixel that emits red, blue, and green light may be provided with a single light emitting device, thereby reducing the number of light emitting devices mounted on the display device. FIG. 1 is a plan view illustrating an LED display apparatus 10 according to the related art. Referring to FIG. 1, the display apparatus 10 includes a display substrate 11 and light emitting devices R, G, and B. Each of the light emitting devices R, G, and B is a micro LED, which has a form factor of about 10000 μm2 or less, which is available in the art. Each of red, green, and blue light emitting devices R, G, and B is a sub-pixel, and sub-pixels constitute one pixel P. A plurality of pixels P is arranged on the display substrate 11 and an image is implemented with these pixels P. The display substrate 11 is a substrate corresponding to an entire screen of the display apparatus, and in some embodiments, millions to tens of millions of micro LEDs are mounted on the display substrate 11. However, due to the small form factor of micro LEDs, it is difficult to handle micro LEDs, and thus, it is not easy to transfer and mount millions to tens of millions of micro LEDs on a display panel. Moreover, the micro LEDs may be damaged by an external impact, and thus, defects may be formed in the micro LEDs during transportation. Accordingly, when all of the micro LEDs are mounted on the display substrate 11 corresponding to one screen, a manufacturing yield of the display apparatus is not favorable. Moreover, since a large number of light emitting devices R, G, and B have to be mounted on the large-area display substrate 11, workability is poor. These drawbacks may occur for a pixel configured to be using a stacked light emitting device. To solve these drawbacks, a tile-shaped micro LED module may be used. FIG. 2 is a plan view illustrating a display apparatus 20 including micro LED modules according to the related art, and FIG. 3 is a schematic partial cross-sectional view taken along line A-A′ of FIG. 2. Referring to FIG. 2, the display apparatus 20 includes a display substrate 21 and tile-shaped micro LED modules T. The micro LED modules T include light emitting devices R, G, and B, and are arranged on the display substrate 21. The micro LED module T may include a plurality of pixels, and these modules T may be mounted on the display substrate 21 to form an entire screen. Accordingly, instead of mounting all of the light emitting devices R, G, and B on the display substrate 21, the light emitting devices R, G, and B may be mounted on a plurality of micro LED modules T, and the display apparatus 20 may be provided by mounting the LED modules T on the display substrate 21. As the display apparatus 20 may be manufactured by selecting favorable LED modules T, a manufacturing yield of the di