Electroluminescent Display Bank Layer Height Control

The patent applies local quality by forming bank layers with different heights in different pixel regions. Specifically, the first bank layer has a first height in the first pixel region, the second bank layer has a second height in the second pixel region, and the third bank layer has a third height in the third pixel region, where the heights are in a 1:2:3 ratio. This local differentiation of bank layer heights enables precise control of light emitting layer thickness in each region, achieving uniform thickness across the entire display while maintaining large size and high definition.

The patent applies parameter changes by systematically varying the bank layer heights across different pixel regions to achieve the desired light emitting layer thickness distribution. The bank layer heights are set in a specific 1:2:3 ratio to compensate for the natural tendency of solution-based deposition to create non-uniform thickness. This parameter adjustment ensures that the light emitting layer achieves uniform thickness, thereby maintaining high color purity and light extraction efficiency while preserving the ease of solution-based manufacturing.

The patent applies segmentation by dividing the display into multiple pixel regions (first, second, and third pixel regions) and forming separate bank layers (first, second, and third bank layers) with different heights in each region. This segmentation approach allows independent control of bank layer height in each pixel region, achieving precise thickness uniformity across the entire display. The segmented structure, while appearing complex, follows a systematic 1:2:3 height ratio that simplifies the manufacturing process and reduces overall device complexity.