Light Guiding Member Reflecting Surfaces for Dark Spot Reduction

The light guiding member incorporates reflecting surfaces with different angles in different regions. The first reflecting surface has a specific angle to reflect light from the first light source toward the first light receiving portion, while the second reflecting surface has a different angle to reflect light from the second light source toward the second light receiving portion. This local variation in reflecting surface angles ensures that each region receives appropriate light redirection to achieve uniform luminance distribution across the light emitting portion.

The patent employs asymmetric reflecting surface angles rather than uniform angles. The first reflecting surface is configured with an angle different from the second reflecting surface angle, creating an asymmetric light guiding structure that compensates for the positional differences between multiple light sources and ensures uniform light distribution to the light receiving portions.

The patent replaces the conventional mechanical approach of using concave/convex portions for light redirection with an optical approach using flat reflecting surfaces with specific angles. Instead of relying on surface curvature to redirect light, the invention uses precisely angled flat surfaces that reflect light through geometric optics, thereby avoiding the spectral diffraction and transmittance loss associated with concave/convex structures.

The invention changes the key parameter from surface curvature (concave/convex) to surface angle (flat surfaces with specific orientations). By controlling the angles of the reflecting surfaces rather than using curved surfaces, the system achieves effective light redirection while maintaining high transmittance and avoiding spectral diffraction effects.