Phase-Only Kinoform Display for Real-Time Video Projection

The patent changes the modulation parameter from amplitude to phase. The spatial light modulator applies phase modulation instead of amplitude modulation, which fundamentally alters how the optical field is controlled. This parameter change enables high light efficiency because phase modulation does not absorb or block light, unlike amplitude modulation which requires absorbing elements that waste light energy.

The patent replaces the mechanical/optical amplitude modulation system with a phase modulation system. Instead of using amplitude-modulating elements that physically block or absorb light, the system uses phase-modulating elements that alter the phase of light waves, achieving image formation through interference patterns rather than amplitude control, thereby eliminating light loss.

The patent extracts only the essential phase information needed for hologram generation, discarding unnecessary computational steps. Instead of using complex iterative algorithms that calculate both amplitude and phase, the system directly computes phase distributions using simplified mathematical approaches, removing redundant calculations while retaining the core functionality of holographic image generation.

The patent segments the hologram generation process into discrete phase calculations for each pixel or group of pixels. By dividing the computational task into smaller, independent phase calculation units, the system can process each segment efficiently and parallelize computations, dramatically reducing overall computational complexity and enabling real-time processing.

The patent introduces the replay field (projection plane) as an intermediary where phase-modulated light from the spatial light modulator forms the final image through optical propagation and interference. The phase information encoded on the SLM acts as a mediator that, when propagated through the optical system, naturally reconstructs the amplitude and phase distribution of the original object wave, achieving high-quality images without amplitude modulation.

The patent employs iterative optimization algorithms that periodically update phase distributions to improve image quality. By repeatedly calculating phase patterns, evaluating their performance, and refining them through multiple iterations, the system converges on optimal phase-only solutions that achieve both high light efficiency and excellent image quality, transforming a potentially compromised approach into a superior one.