Reflective Display Brightness Uniformity via Local Light Absorption

The patent applies local quality by placing light-absorbing portions at specific locations (sides of the light guide plate in the first region) rather than uniformly across the entire structure. This localized approach allows the gel layer to remain for easy manufacturing while the light-absorbing portions selectively block stray light only where needed, maintaining brightness uniformity without compromising manufacturing simplicity.

The light-absorbing portions act as intermediaries between the light guide plate and the surrounding environment. These intermediary elements selectively absorb transmitted light beams that would otherwise cause brightness non-uniformity, while allowing the gel layer to maintain its bonding function. The intermediary light-absorbing portions resolve the contradiction by mediating between the conflicting requirements of easy manufacturing and uniform brightness.

The patent uses local quality by positioning light-absorbing portions only at the sides of the light guide plate in the first region, rather than applying a light-absorbing layer across the entire light guide plate surface. This localized placement ensures that only stray light beams that would cause bright banding are absorbed, while the majority of light beams in the second region that need to undergo total internal reflection remain unaffected, thus maintaining high light efficiency.

The patent applies segmentation by dividing the light guide plate into different regions: a first region where light-absorbing portions are placed to handle stray light, and a second region where total internal reflection occurs for efficient light transmission. This segmentation allows the system to simultaneously achieve brightness uniformity and high light efficiency by treating different spatial zones differently.