Optical Switching Element Viewing Angle Control

The patent applies a liquid crystal layer that can dynamically change its molecular alignment state based on applied voltage. When voltage is applied, the liquid crystal molecules align in the vertical direction to narrow the viewing angle and prevent side peeping. When voltage is removed, the molecules return to their original orientation to restore wide viewing angle and oblique visibility. This dynamic switching resolves the contradiction between security and usability.

The patent uses the liquid crystal layer's inherent electro-optic properties to achieve viewing angle switching without requiring external mechanical components or complex optical systems. The liquid crystal material itself performs the viewing angle control function through voltage-induced molecular reorientation, eliminating the need for additional substrates, prisms, or movable parts. This self-service approach maintains simple device configuration while achieving the desired security function.

The patent replaces mechanical or optical image processing systems with an electro-optic liquid crystal layer that directly controls light transmission. Instead of requiring image rotation or aspect ratio adjustment through complex processing, the liquid crystal layer physically modulates the viewing angle through molecular alignment changes, achieving the same security effect without computational overhead.

The patent applies the liquid crystal layer locally to the display screen without affecting the overall device geometry. The liquid crystal layer maintains the same physical dimensions and aspect ratio as the underlying display panel, while only the optical properties (viewing angle) are changed through local molecular alignment. This preserves the aspect ratio while achieving security functionality.