OLED Display Substrate Reflection Structure for Front-Angle Brightness

The reflection layer is segmented into multiple functional layers: a first reflection layer with first refractive index, a second reflection layer with second refractive index, and a third reflection layer with third refractive index. Each layer is designed with specific thickness and refractive index properties to address different aspects of light management, thereby reducing waveguide effect and improving light transmittance without creating a single complex monolithic structure.

The patent employs a composite reflection layer structure combining multiple materials with different refractive indices. The first reflection layer has refractive index n1, the second has n2, and the third has n3, where these indices are specifically selected to create optimal optical conditions. This composite approach enables simultaneous reduction of waveguide effect and maintenance of structural feasibility.

Each reflection layer is designed with specific local optical properties: the first reflection layer has refractive index n1 optimized for certain wavelength ranges, the second has n2 for intermediate ranges, and the third has n3 for specific applications. The thickness of each layer (d1, d2, d3) is specifically controlled to provide localized optical enhancement, thereby improving brightness at front viewing angles while maintaining compatibility with existing manufacturing processes.

The patent systematically varies key parameters including refractive indices (n1, n2, n3) and thicknesses (d1, d2, d3) of the three reflection layers to optimize optical performance. By adjusting these parameters, the structure achieves enhanced brightness at front viewing angles while remaining manufacturable, as the variations are within standard fabrication capabilities.

The reflection structure implements a nested configuration where the second reflection layer is positioned between the first and third reflection layers, creating a nested three-layer structure. Each layer is optimized for specific optical functions: the first layer handles certain wavelength ranges and angular conditions, the second layer provides intermediate optimization, and the third layer addresses specific viewing angles. This nested arrangement enhances light condensation efficiency while keeping the overall structure manageable.

The patent transitions from a single-plane reflection layer to a three-dimensional multi-layer structure with varying thicknesses and refractive indices. The first reflection layer has thickness d1, the second has d2, and the third has d3, creating optical paths in multiple dimensions. This dimensional expansion enables enhanced light condensation by providing multiple reflection paths and angular conditions, while the layered architecture keeps the complexity organized and manufacturable.