Off-Axis Dual Mirror Backlight for HUD Uniformity

The patent divides the single light source system into multiple light sources (first light source and second light source), each with its own conical light cup. This segmentation allows different light paths to be controlled independently, enabling one light source to provide focused illumination while another ensures full coverage of the display module, thus resolving the contradiction between reduced diffusion angle and complete coverage.

The patent introduces a reflective plate as an intermediary element positioned at the bottom of the conical light cup array. This reflective plate redirects light that would otherwise be lost, ensuring that light from the conical light cups is efficiently utilized to illuminate the display module. The reflective plate acts as a mediator that reconciles the focused light path with the need for complete coverage.

The patent segments the illumination system into multiple light sources with individual conical light cups, allowing each segment to contribute to different aspects of the lighting performance. This segmentation enables the system to achieve both large effective light source area and uniform light distribution by combining the outputs of multiple controlled segments.

The patent applies different optical configurations to different parts of the lighting system. The conical light cups are optimized for one function while the reflective plate and additional light sources are optimized for another, creating local quality variations that collectively achieve uniform overall illumination.