Organic EL Display Patterning via Soluble Release Layer

The patent extracts and removes the harmful residual insulative layer and impurities from the organic compound layer surface through selective etching processes. The etching solution specifically targets and removes the photolithography residues without damaging the underlying organic compound layer, thereby eliminating the source of element characteristic deterioration while maintaining the productivity benefits of photolithography.

The patent changes the chemical parameters of the etching solution to achieve selective removal of residues. By carefully controlling the composition, concentration, and treatment conditions of the etching solution, the process selectively removes insulative layer residues and impurities while preserving the organic compound layer integrity, thus improving element characteristics without sacrificing manufacturing efficiency.

The patent replaces the mechanical metal mask system with a chemical etching system. Instead of using physical masks that require alignment, handling, and cleaning, the invention uses a chemically selective etching process that patterns the organic compound layer directly. This substitution eliminates the mechanical complexity of metal masks while maintaining pattern precision and improving manufacturing throughput.

The patent introduces an intermediary insulative layer that facilitates the patterning process. This intermediate layer is deposited over the organic compound layer, patterned using photolithography, and then used as a mask for selective etching. The intermediary layer enables precise patterning without requiring direct metal mask contact with the organic layer, thereby simplifying the manufacturing process while maintaining element characteristics.

The patent replaces the mechanical constraint of metal mask fineness with a chemical patterning approach. By using photolithography combined with selective etching, the process can achieve sub-100 μm pixel dimensions without requiring proportionally finer metal masks. The chemical etching process maintains pattern fidelity at reduced dimensions, enabling higher display resolution without increasing device complexity.

The patent transitions from two-dimensional mask plane constraints to three-dimensional selective etching control. By depositing an intermediary insulative layer and using photolithographic patterning in the vertical dimension, the process achieves fine horizontal pixel dimensions without being constrained by mask fineness in the horizontal plane. This dimensional transition enables reduced pixel sizes while maintaining manufacturing simplicity.

The patent replaces the heavy mechanical metal mask system with a lightweight photolithographic patterning system. The intermediary insulative layer and photomask used in the new process are significantly lighter than large-format metal masks, reducing handling difficulty and equipment requirements. This substitution enables large substrate processing while minimizing the weight and complexity of the patterning tools.

The patent uses the vertical dimension of the intermediary insulative layer to achieve horizontal patterning without requiring large, stiff masks. The photolithographic process exposes the entire substrate area through optical projection, eliminating the need for mechanically stiff masks that would be required for direct contact patterning of large substrates. This approach enables large-format display manufacturing with reduced tooling weight and improved handling.