OLED Pixel Structure Compensation Layer for Brightness

The patent divides the pixel structure into multiple functional layers (substrate, anode, hole injection layer, hole transport layer, emission layer, electron transport layer, electron injection layer, cathode) and further segments the emission layer into red, green, and blue sub-pixels with distinct color filters. This segmentation allows each layer to be optimized independently for its specific function, reducing the manufacturing precision requirements for the overall pixel structure while maintaining high brightness and color purity.

The patent implements local quality by providing different color filters (red, green, blue) for different pixel regions, and using different organic emission materials with specific HOMO-LUMO energy levels for different color sub-pixels. Each region is locally optimized with materials and structures tailored to its specific color emission requirements, thereby achieving high color purity without requiring extremely precise shadow mask manufacturing.

Instead of using a single white light OLED layer, the patent employs separate organic emission layers for red, green, and blue sub-pixels, each with specifically selected emission materials having appropriate HOMO-LUMO energy levels. This local quality approach allows each sub-pixel to emit its characteristic color directly, eliminating the need for color filters and preserving brightness while maintaining manageable device complexity.

The patent achieves color display through color changes in the organic emission materials themselves rather than through color filters. By selecting emission materials with different HOMO-LUMO energy levels that correspond to red, green, and blue wavelengths, the patent directly generates colored light emission, thereby avoiding brightness loss associated with color filtering while keeping the device structure relatively simple.