OLED Light Extraction via Selective Transparent Conductor Placement

The patent applies local quality by positioning the transparent conductive layer selectively - only in regions where it is needed for optical path optimization. For red emission elements, the transparent conductive layer is placed between the reflective electrode and the organic compound layer. For green and blue emission elements, the transparent conductive layer is omitted. This localized application optimizes light extraction for red elements without complicating the overall production process or creating surface discontinuities.

The patent uses local quality to avoid varying the thickness of the transparent conductive layer across different emission colors. Instead, the layer is selectively present only where needed (for red emission). This approach maintains uniform thickness where the layer exists, preventing drive voltage increases and surface discontinuities that would result from thickness variation across different color elements.

The patent applies preliminary action by pre-determining the regions where the transparent conductive layer should be present during the deposition process. The layer is formed only in the necessary regions (red emission areas) from the beginning, eliminating the need for subsequent etching processes to adjust thickness or create patterns. This approach maintains optimal optical characteristics while preserving high production speed.