Field-Oriented Sol-Gel Polarizing Layer for Flexible OLED Displays

The patent changes the physical and chemical parameters of the polarizing layer by using a sol-gel process to create a thin-film structure (5-50 μm) instead of conventional thick polarizers (150-250 μm). The sol-gel method allows precise control of film thickness and porosity, achieving both reduced thickness and maintained mechanical strength through optimized material composition and processing parameters.

The patent employs composite materials consisting of metal oxide precursors (such as silicon oxide, titanium oxide) combined with polarizing dyes and organic-inorganic hybrid structures. This composite approach enables the thin film to achieve both mechanical strength and polarizing function simultaneously, resolving the contradiction between thickness reduction and strength maintenance.

The patent applies the principle of flexible thin films by developing a sol-gel derived polarizing layer that is inherently flexible and thin (5-50 μm). The sol-gel process creates a porous, flexible network structure that can accommodate bending without breaking, while the cross-linked inorganic-organic hybrid matrix provides the necessary mechanical strength.

The patent modifies the mechanical parameters of the thin film through sol-gel processing conditions, including precursor composition, drying temperature, and curing conditions. These parameter changes optimize the balance between film flexibility and mechanical strength, enabling the thin polarizing layer to maintain both bendability and structural integrity.

The patent merges the polarizing function and the reflection elimination function into a single integrated thin-film layer. Instead of separately attaching a circular polarizer to the OLED, the sol-gel process directly forms a polarizing layer with controlled optical properties that can eliminate reflections while maintaining device simplicity and reducing overall complexity.

The sol-gel derived polarizing layer serves multiple functions simultaneously: it provides linear polarization, enables circular polarization when combined with a quarter-wave plate, and eliminates external reflections. This multi-functional design reduces the need for separate components, thereby reducing device complexity while maintaining high contrast performance.