Electroluminescent Display Device Electrode Thickness Optimization

The patent applies different thicknesses to different colored emitting layers based on their specific light extraction requirements. The red emitting layer is made thicker than the green and blue layers, as red light has different optical properties and requires greater thickness for optimal extraction. This localized differentiation resolves the contradiction by optimizing each layer individually rather than using a uniform thickness, thereby improving overall light extraction efficiency without unnecessarily increasing processing time for all layers.

The patent carefully controls and optimizes the thickness parameter of the blue emitting layer to achieve the desired microcavity effect while preventing profile non-uniformity. By precisely adjusting the blue layer thickness to a specific range, the patent simultaneously satisfies both the microcavity requirement (which benefits from thinner layers) and the uniformity requirement (which needs sufficient thickness). This parameter optimization resolves the contradiction by finding the optimal thickness value that balances both competing requirements.

The patent implements local quality differentiation by assigning specific thickness values to each emitting layer based on its color and optical characteristics. The red layer is made thicker than the green and blue layers, creating a tailored structure that optimizes light extraction for each color. This approach improves external extraction efficiency while keeping the complexity manageable by using a systematic thickness differentiation strategy rather than arbitrary variations.