Maskless OLED Structuring via Repellent Layer

The invention extracts and removes the shadow mask component from the manufacturing process entirely. Instead of using physical masks to define patterns, the method applies a repellent layer directly to specific areas of the substrate where material deposition should be prevented. This eliminates the need for multiple masks while maintaining inline processing capability, as the repellent layer is applied before sequential layer deposition begins.

The invention introduces a repellent layer as an intermediary substance between the substrate and the evaporated materials. This repellent layer acts as a mediator that prevents material adhesion in specific areas without requiring physical obstruction. The repellent layer can be applied selectively to define patterns and fully enclose non-emitting areas, solving the limitation of shadow masks while maintaining process efficiency.

The invention removes the mask frame structure entirely, replacing it with a repellent layer that can be applied directly to the substrate in any desired pattern. This allows non-emitting areas to be fully enclosed without requiring connections to a mask frame, enabling complete pattern definition including isolated islands and complex geometries that shadow masks cannot achieve.

The invention applies the repellent layer with local quality, meaning different areas of the substrate receive different treatments. The repellent layer is applied only to specific regions where non-emitting areas should be formed, allowing precise control over pattern definition while enabling complete enclosure of non-emitting areas. This local application method overcomes the global constraint of shadow mask frames.

The invention makes the repellent layer application process universal, where a single application method can create any desired pattern by varying only the areas where the repellent layer is applied. Unlike shadow masks that require different physical masks for different patterns, the repellent layer method uses the same process step with different application locations to achieve pattern variation, eliminating the need for a large mask inventory while maintaining design flexibility.

The invention changes the parameter being controlled from mask selection to repellent layer application location and area. Instead of selecting different masks from an inventory, the process varies the spatial parameters of repellent layer application to achieve different patterns. This parameter change approach maintains adaptability for different OLED designs while dramatically reducing device complexity and inventory requirements.