TWI898368B - Tiling film and tiled display - Google Patents

Abstract

A tiling film includes a flexible substrate, a protective layer disposed above or below the flexible substrate to prevent electromagnetic interference, and a glue layer disposed below the flexible substrate for pasting a plurality of display units.

Description

Splicing films and splicing displays

The present invention relates to a display, and more particularly to a splicing film suitable for splicing displays.

A tiled display is a display system composed of multiple smaller displays arranged in a grid pattern to form a larger single display. Tiled displays are commonly used in large wall-mounted televisions in homes or large public venues such as airports, shopping malls, and stadiums to display advertisements, information, or other content.

MicroLED (mLED, microLED, or μLED) displays are a type of flat panel display that consists of individual microscopic LEDs ranging in size from 1 to 100 microns, minus the substrate. Compared to traditional liquid crystal display panels, microLED displays offer higher contrast and faster response times while consuming less power. While microLEDs share the same low power consumption characteristics as organic light-emitting diodes (OLEDs), microLEDs utilize Group III-V diode technology (e.g., gallium nitride), resulting in higher brightness, higher luminous efficiency, and a longer lifespan than organic light-emitting diodes.

Traditional tiled displays present numerous issues that hinder the user experience. For example, they cannot be folded and stored like flexible displays, making transportation and installation difficult and costly. Furthermore, their surfaces are not flat, affecting image clarity and visual quality. More seriously, they are susceptible to interference from external electromagnetic fields, causing display distortion or failure. Therefore, there is an urgent need for a novel mechanism to address these numerous shortcomings of traditional tiled displays.

In view of the above, one of the objectives of the embodiments of the present invention is to provide a foldable spliced display that uses a splicing film to attach multiple display units, having the advantages of being foldable, having a flat surface, and being able to prevent electromagnetic interference.

According to an embodiment of the present invention, the splicing film includes a flexible substrate, a protective layer, and an adhesive layer. The protective layer is disposed above or below the flexible substrate to prevent electromagnetic interference. The adhesive layer is disposed below the flexible substrate to adhere multiple display units.

According to another embodiment of the present invention, a spliced display includes a plurality of display units and a splicing film. A plurality of light-emitting elements and drivers are disposed on the top surfaces of the display units. The top surfaces of the display units are attached to the bottom surface of the splicing film to form a single spliced display.

FIG1A shows a top view of a foldable tiled display 100 according to an embodiment of the present invention, FIG1B shows a perspective view of the tiled display 100 shown in FIG1A, and FIG1C shows a perspective view of the folded tiled display 100. Although the following embodiments use micro-luminescent diode display technology as an example, the present invention is applicable to other flat panel display technologies.

In this embodiment, the spliced display 100 may include a plurality of display units 11 (FIG. 1A/FIG. 1B illustrate two display units, but are not limited thereto), such as a micro-luminescent diode display unit. The spliced display 100 may include a tiling film 12. The upper surfaces of the display units 11 are attached to the lower surface of the tiling film 12 to form a single spliced display 100. The spliced display 100 may be folded along the interval (interval or gap) 13 between adjacent display units 11 as a folding line 14, so that the upper surfaces of the spliced displays 100 corresponding to the adjacent display units 11 are folded toward each other to form a folded spliced display 100, as shown in FIG. 1C, which is convenient for transportation and assembly. The size of the spacer 13 must be precisely controlled so that the pixel pitch of two adjacent display units 11 does not change across the fold line 14 due to the presence of the spacer 13 .

FIG2A shows a cross-sectional view of the spliced display 100 along the section line 2-2' of FIG1A before the display unit 11 of the embodiment of the present invention is attached to the splicing film 12.

The splicing film 12 of this embodiment may include a (transparent) flexible substrate 121, whose material is, for example, polyethylene terephthalate (PET). In one embodiment, the flexible substrate 121 may include a waterproof air layer to prevent moisture from penetrating the display unit 11.

The splicing film 12 of this embodiment may include a (transparent) optical layer 122, which is (directly or indirectly) disposed above the flexible substrate 121 to improve optical performance. In one embodiment, the optical layer 122 is formed on the upper surface of the flexible substrate 121 using a coating technique. The optical layer 122 may be an anti-reflective (AR) layer, an anti-glare (AR) layer, or both. The anti-reflective layer can reduce the amount of light reflected from the upper surface of the spliced display 100, making it easier to see the content on the screen. The working principle of the anti-reflective layer is to allow more light to pass through the surface of the flexible substrate 121 instead of reflecting it back to the viewer. The anti-glare layer can reduce the amount of light reflected from the upper surface of the spliced display 100, making it easier to view in a bright environment. The anti-glare layer works by scattering the light that strikes the surface of the flexible substrate 121, reducing the amount of glare reflected back to the viewer.

The splicing film 12 of this embodiment may include a (transparent) protective layer 123, which is (directly or indirectly) disposed above or below the flexible substrate 121 to improve electromagnetic radiation problems and achieve electromagnetic interference (EMI) protection. In one embodiment, the protective layer 123 is formed on the lower surface of the flexible substrate 121 using sputtering technology. In this embodiment, the protective layer 123 is an indium tin oxide (ITO) layer, which is a transparent and colorless mixture of indium oxide (In2O3) and tin oxide (SnO2). The protective layer 123 should be properly grounded to form a stable electromagnetic radiation blocking layer.

The splicing film 12 of this embodiment may include a (transparent and flexible) adhesive layer 124 disposed (directly or indirectly) below the flexible substrate 121. This enhances the adhesion between the lower surface of the protective layer 123 and the upper surface of the display unit 11, thereby allowing the display unit 11 to adhere to the splicing film 12. In one embodiment, the adhesive layer 124 is formed on the lower surface of the protective layer 123.

In this embodiment, the display unit 11 may include a display substrate 111, such as glass. The display unit 11 may include an opaque layer 112 (such as a black matrix (BM)) disposed (directly or indirectly) beneath the display substrate 111 to prevent light leakage and crosstalk between adjacent display units. In one embodiment, the opaque layer 112 is formed on the lower surface of the display substrate 111.

The display unit 11 of this embodiment may include a stacked layer 113 of an insulating layer and metal wires, disposed (directly or indirectly) above the display substrate 111. In one embodiment, the stacked layer 113 is formed on the upper surface of the display substrate 111.

The display unit 11 may include a plurality of light-emitting elements 114 (e.g., micro-luminescent diodes) and a driver 115 (e.g., a display driver integrated circuit (DDIC)), disposed (directly or indirectly) above a stack 113. In one embodiment, the light-emitting elements 114 and the driver 115 are bonded to the top surface of the stack 113. Generally, the thickness of the driver 115 is greater than that of the light-emitting elements 114.

FIG2B shows a cross-sectional view of the spliced display 100 along the section line 2-2' of FIG1A after the display unit 11 of the embodiment of the present invention is attached to the splicing film 12.

According to one feature of this embodiment, the thickness of the adhesive layer 124 is greater than the maximum thickness of the light-emitting elements 114 and the driver 115. When the light-emitting elements 114 and the driver 115 of the display unit 11 are bonded to the adhesive layer 124 of the splicing film 12, the adhesive material of the adhesive layer 124 gradually deforms to fill in and adapt to the different thicknesses of the light-emitting elements 114 and the driver 115, thereby maintaining the flatness of the top surface of the adhesive layer 124 (and the entire splicing film 12).

The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the patent application of the present invention. Any other equivalent changes or modifications that do not deviate from the spirit disclosed in the invention should be included in the scope of the patent application below.

100: Tiled display 11: Display unit 111: Display substrate 112: Optical opaque layer 113: Overlay 114: Light-emitting element 115: Driver 12: Tiled film 121: Flexible substrate 122: Optical layer 123: Protective layer 124: Adhesive layer 13: Spacer 14: Fold line

Figure 1A shows a top view of a foldable video splice display according to an embodiment of the present invention. Figure 1B shows a perspective view of the video splice display according to Figure 1A. Figure 1C shows a perspective view of the video splice display after folding. Figure 2A shows a cross-sectional view of the video splice display taken along section line 2-2' of Figure 1A before the display unit according to an embodiment of the present invention is attached to the splice film. Figure 2B shows a cross-sectional view of the video splice display taken along section line 2-2' of Figure 1A after the display unit according to an embodiment of the present invention is attached to the splice film.

100: Tiled display 11: Display unit 111: Display substrate 112: Optical opaque layer 113: Overlay 114: Light-emitting element 115: Driver 12: Tiled film 121: Flexible substrate 122: Optical layer 123: Protective layer 124: Adhesive layer

Claims (14)

A splicing film comprises: a flexible substrate; a protective layer disposed above or below the flexible substrate to prevent electromagnetic interference; and an adhesive layer disposed below the flexible substrate to adhere multiple display units; a plurality of exposed light-emitting elements and drivers are disposed on the top surface of the display units and directly attached to the bottom surface of the adhesive layer; a black matrix layer is disposed on the bottom of the display units. The splicing film of claim 1, wherein the flexible substrate comprises a waterproof air layer. The splicing film of claim 1 further comprises: An optical layer disposed above the flexible substrate to improve optical performance. The splicing film of claim 3, wherein the optical layer comprises an anti-reflection layer, an anti-glare layer, or both. The splicing film of claim 1, wherein the protective layer comprises an indium tin oxide layer. A tiled display comprises: a plurality of display units, each having a plurality of exposed light-emitting elements and drivers on its top surface; and a tiled film, the top surfaces of the plurality of display units being attached to the bottom surface of the tiled film to form a single tiled display. The tiled film comprises: a flexible substrate; a protective layer disposed above or below the flexible substrate to prevent electromagnetic interference; and an adhesive layer disposed below the flexible substrate to directly adhere the light-emitting elements and drivers exposed on the top surfaces of the plurality of display units. A black matrix layer is disposed on the bottom of the display units. A spliced display as claimed in claim 6, wherein the thickness of the adhesive layer is greater than the maximum thickness of the plurality of light-emitting elements and the driver. A spliced display as claimed in claim 6, wherein the flexible substrate includes a waterproof air layer. The spliced display of claim 6 further comprises: An optical layer disposed above the flexible substrate to improve optical performance. The spliced display of claim 9, wherein the optical layer comprises an anti-reflection layer, an anti-glare layer, or both. The tiled display of claim 6, wherein the protective layer comprises an indium tin oxide layer. A spliced display as claimed in claim 6, wherein each display unit comprises a micro-luminescent diode display unit. The spliced display of claim 12, wherein the display unit comprises: a display substrate; and a stack comprising an insulating layer and metal conductors, disposed above the display substrate; wherein the plurality of light-emitting elements and the driver are disposed above the stack. The spliced display of claim 13, wherein the display unit further comprises: An opaque layer disposed below the display substrate.