Micro-LED Display Planarization for Bending Region Transfer
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Solution Overview
Problem
The manufacturing process of micro light-emitting diode display apparatuses faces challenges in ensuring a flat thickness in bending portions, leading to improper transfer of micro light-emitting diodes.
Innovation Solution
A display apparatus is designed with a substrate having a bending region, a planarization film, and multiple organic films coated in a specific manner to ensure the upper surface of the third organic film is flattened in the active region, facilitating the proper transfer of light-emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the substrate is manufactured with a bending portion, then the display apparatus can be bent, but the thickness of the bending portion or its adjacent portion is not formed flat, causing improper transfer of micro light-emitting diodes
Solution Approach 1:
A planarization film is formed on the substrate before transferring the micro light-emitting diodes, specifically covering the bending portion and adjacent portions to pre-establish a flat surface. This preliminary planarization ensures that when micro light-emitting diodes are transferred, they land on a flat surface even though the substrate has bending portions, thereby resolving the contradiction between bending capability and transfer precision.
2Manufacturing precision
If multiple organic films are coated sequentially, then the upper surface can be flattened in the active region, but the manufacturing process complexity increases
Solution Approach 1:
Multiple organic films (first organic film, second organic film, and third organic film) are coated sequentially, with each subsequent film serving dual purposes: providing functional coverage and contributing to surface planarization. The third organic film is specifically formed to flatten the upper surface in the active region while also serving as the final functional organic layer, thereby merging planarization function with functional layer requirements to reduce overall process complexity.
Data Source
AI summary
A display apparatus according to an exemplary embodiment is disclosed. A display apparatus according to an exemplary embodiment includes a substrate having a bending region between an active area and a pad area. The display apparatus includes a planarization film on the active area and the pad area in the substrate. The display apparatus includes a first organic film coated on the planarization film, a second organic film coated on the first organic film, and a third organic film coated on the second organic film. The third organic film is formed such that an upper surface thereof is flattened in the active region. The display apparatus includes a plurality of light-emitting elements disposed on the third organic film.