Cholesteric LCD Transparency via Phase Delay Switching

The patent applies a dynamic switching mechanism using a ½ phase difference LC layer that can change its phase delay state between 0 and ½ wavelength based on applied voltage. This allows the display to dynamically switch between transparent and opaque states, resolving the contradiction by making transparency a controllable variable rather than a fixed property

The patent changes the optical parameter of the LC layer by introducing a ½ phase difference LC layer that can alter the phase delay of circularly polarized light. By controlling the phase delay parameter between 0 and ½ wavelength, the system achieves variable transparency while maintaining image display quality through coordinated control of the cholesteric LC and phase delay layers

The patent merges multiple optical functions into an integrated structure where the cholesteric LCD panel, ½ phase difference LC layer, ¼ phase delay sheets, and polarized sheets work together as a unified system. The ½ phase difference LC layer is positioned between the ¼ phase delay sheets to create a compact arrangement that achieves bidirectional transparency without excessive structural complexity

The patent creates a multi-functional display device that simultaneously provides image display, bidirectional transparency control, and variable opacity states. The same optical components (cholesteric LC, phase delay layers, polarized sheets) perform multiple functions: displaying images, controlling light transmission, and enabling bidirectional viewing, thereby reducing the need for separate dedicated components