Concave Mirror Illumination System for LCD Uniformity

The patent applies a concavely curved specular reflecting mirror to redirect light from the source toward the diffuse reflecting screen. The curved surface focuses and distributes light more uniformly across the screen while directing reflected light away from the observer's line of sight, thereby reducing glare. This curvature transforms the light distribution pattern to achieve both uniformity and glare reduction simultaneously.

The patent positions the light source at an angle relative to the diffuse reflecting screen, with the central vector of emitted light inclined at an angle alpha between 10-80 degrees from the normal axis. This angular positioning in a different dimensional orientation allows light to be distributed uniformly across the screen while preventing direct line-of-sight exposure to the light source, thus reducing glare without compromising uniformity.

The concavely curved specular reflecting mirror compensates for the angular misalignment by focusing and redistributing the inclined light rays. The curvature geometry is designed to capture light emitted at angle alpha and redirect it to illuminate the diffuse reflecting screen uniformly, thereby maintaining luminance uniformity even when the light source is positioned to reduce glare.

The patent optimizes the angle alpha of the central vector within the range of 10-80 degrees from the normal axis. By adjusting this parameter, the system finds the optimal balance between glare reduction and uniform light distribution. The specular mirror's curvature radius and position are also tuned as parameters to compensate for the angular offset and maintain uniform illumination.

The patent combines the functions of light redirection and uniform distribution into a single concavely curved specular reflecting mirror. This mirror performs the work that would otherwise require multiple separate components such as diffusers and brightness enhancement films. By merging these functions into one element, the system achieves improved uniformity without increasing device complexity or thickness.

The concavely curved specular reflecting mirror acts as an intermediary between the light source and the diffuse reflecting screen. It mediates the light distribution by first collecting light from the angled source and then redirecting it uniformly onto the screen, eliminating the need for additional diffusing layers or enhancement films that would otherwise be required to achieve the same effect.