Patent ID: 12261159

DETAILED DESCRIPTION OF THE INVENTION

FIG.1shows a schematic diagram illustrating a top view of a micro-light-emitting diode (microLED) display panel100according to one embodiment of the present invention.

In the embodiment, the microLED display panel100may include a plurality of microLEDs11arranged in rows and columns (i.e., in matrix form), and disposed on a substrate10, for example, a transparent substrate such as glass substrate. Each microLED11shown inFIG.1and the following figures may represent a single microLED or may be composed of sub-microLEDs, for example, red sub-microLED, green sub-microLED and blue sub-microLED. In one embodiment, the microLED display panel100is a top-emission display panel that emits light upward or against the substrate10. The microLED display panel100may include at least one driver12, such as an integrated circuit, disposed on the substrate10. In the embodiment, the microLEDs11are driven by a passive matrix addressing (or driving) scheme.

According to one aspect of the embodiment, the microLED display panel100may include a plurality of first blocking walls13respectively disposed between rows of the microLEDs11, and disposed on or above the substrate10. The first blocking walls13are used to block light, and may include an opaque material. In one exemplary embodiment, the first blocking walls13may further include a nonreflective material.

As exemplified inFIG.1, the first blocking walls13are disposed laterally in a first direction (e.g., X axis) and are separated by the rows of the microLEDs11. Moreover, the first blocking walls13are parallel with the driver12, which is also disposed laterally (e.g., in X axis). In the embodiment, the first blocking walls13may or may not cover the driver12.

FIG.2shows a schematic diagram illustrating a cross-sectional view of the microLED display panel100along a cross line2-2′ ofFIG.1. As exemplified inFIG.2, each of the microLEDs11may be covered with at least one encapsulation layer111, which may have a profile of round, oval or rectangular shape. The encapsulation layer111of the embodiment has reflectivity greater than 1. The first blocking wall13may have a profile (e.g., round, oval or rectangular shape) compatible with the encapsulation layer111. In the embodiment, a height of the first blocking wall13is the same as or greater than a height of the driver12. Preferably, the height of the first blocking wall13is comparable with the height of the driver12. In one example, the driver12has a height of 150 micrometers (um) and the first blocking wall13has a height of 150-200 um.

FIG.3shows a schematic diagram illustrating a cross-sectional view of the microLED display panel100along a cross line3-3′ ofFIG.1. According to another aspect of the embodiment, referring toFIG.1andFIG.3, the microLED display panel100of the embodiment may include a plurality of second blocking walls14respectively disposed between microLEDs11of the same row, and disposed on the substrate10. The second blocking walls14are used to block light, and may include an opaque material. In one exemplary embodiment, the second blocking walls14may further include a nonreflective material. Generally speaking, orientation of the first blocking walls13and the second blocking walls14may be determined according to viewing angle requirement and/or orientation of the driver12. The second blocking wall14may have a profile (e.g., round, oval or rectangular shape) compatible with the encapsulation layer111. In order not to obstruct lighting of the microLEDs11, the second blocking walls14do not cover the microLEDs11.

The height of the first blocking wall13is substantially larger than a height of the second blocking wall14. In one exemplary embodiment, the ratio of the first blocking wall13to the second blocking wall14in height is approximately the same as the ratio of the driver12to the microLED11in height.

In the embodiment, a height of the second blocking wall14is the same as or greater than a height of the microLED11. Preferably, the height of the second blocking wall14is comparable with the height of the microLED11. In one example, the microLED11has a height of 7-10 um and the second blocking wall14has a height of 10-20 um.

FIG.4Ashows a schematic diagram illustrating a cross-sectional view of the microLED display panel100along a cross line4-4′ ofFIG.1. Referring toFIG.1andFIG.4A, the second blocking walls14are disposed longitudinally (e.g., in Y axis) between columns of microLEDs11on the substrate10. Subsequently, the first blocking walls13are disposed laterally (e.g., in X axis) between rows of microLEDs11on the substrate10and between the second blocking walls14. In one exemplary embodiment, the second blocking walls14and the first blocking walls13may be coated in sequence by a dispenser or an inkjet. In another example, the second blocking walls14and the first blocking walls13may be coated in sequence by photolithography technique, capable of forming the second blocking walls14and the first blocking walls13more precisely than the dispenser or inkjet. In either case, the total height at the overlapped area (of the second blocking walls14and the first blocking walls13) is the added heights of the second blocking wall14and the first blocking wall13.

FIG.4Bshows a schematic diagram illustrating another cross-sectional view of the microLED display panel100along a cross line4-4′ ofFIG.1. Referring toFIG.1andFIG.4B, the first blocking walls13and the second blocking walls14are coated on the substrate10at the same time (without overlapping). In one exemplary embodiment, a molding process is adopted by using a mold (a schematic diagram is shown inFIG.4C), which is a hollowed-out block that may be filled with an opaque material.

It is appreciated that the microLEDs11in the preceding embodiments need not be arranged symmetrically in one or more directions.FIG.5shows a schematic diagram illustrating a top view of a microLED display panel100according to one embodiment of the present invention. According to a further aspect of the embodiment, microLEDs11within an area101adjacent to the driver12may be asymmetrically arranged along at least one direction with respect to microLEDs11outside the area101. As exemplified inFIG.5, two (partial) rows of microLEDs11within the area101adjacent to the top of the driver12are shifted upward with respect to microLEDs11outside the area101. The shifting distance may be determined according to viewing angle requirement or size/resolution of the display. In one example, the top row of microLEDs11within the area101is shifted upward with 50-100 um with respect to microLEDs11outside the area101, and the bottom row of microLEDs11within the area101is shifted upward with 50-150 um with respect to microLEDs11outside the area101.

Although specific embodiments have been illustrated and described, it will be appreciated by those skilled in the art that various modifications may be made without departing from the scope of the present invention, which is intended to be limited solely by the appended claims.