Fig. 1. System configuration. (a) Conventional LCoS display with a bulky PBS as the illumination optics. (b) The proposed new LCoS display module with a compact illumination optics.

Fig. 2. Simulation results with periodically distributed extraction prisms. (a) Illuminance at the top of LCoS system. (b) Cross-sectional diagram along Z direction.

Fig. 3. Optimization for zone lengths and aperture ratios of extraction prisms. (a) Definition of TIR length. (b) The extraction prisms are divided into several zones. (c) Transmission, extraction, and efficiency of different aperture ratios. Cross-sectional diagram of extracted light for one zone (d) and two zones (e) with different normalized zone lengths. (f) Calculations for aperture ratios.

Fig. 4. Simulated illuminance. Simulated illuminance uniformity with W/P = [0.1419, 0.1737, 0.2144, 0.3151, 0.5] for the five zones without (a) and with (b) absorbing coating on the end surface of the LGP. (c) Uniformity with optimized W/P = [0.155, 0.1737, 0.2144, 0.25, 0.35] for the 5 zones without absorbing coating. (d) Cross-sectional diagrams.

Fig. 5. Optimization for parameters L and D. (a) Cross-sectional diagrams of illuminance with different L values. (b) Cross-sectional diagrams of illuminance and (c) luminous intensity with different D values. (d) Origins of the valley in (c).

Fig. 6. ANSI contrast of the LCoS system. Stray light resulted from a small H (a) and a large H (b). (c) Checkerboard pattern for ANSI contrast simulation. (d) Imaging results of the checkerboard pattern. (e) Dependence of ANSI contrast on the height-to-width ratio of the extraction prisms. (f) TIR at the end surface of the LGP. (g) Cross-sectional diagrams (X = −0.625) of the checkerboard images.

Fig. 7. Imaging performance. (a) Object. Imaging results produced by (b) a flat panel display and (c) our proposed compact LCoS system.

Fig. 8. Color performance. (a) Refractive index dispersion of Corning ARS 2.0 glass. (b) Cross-sectional diagrams of illuminance and (c) luminous intensity. Illuminance produced by light sources with λ = 450 nm (d), 550 nm (e), and 630 nm (f). Luminous intensity produced by light sources with λ = 450 nm (g), 550 nm (h), and 630 nm (i).

Fig. 9. Simulations with a n = 1.7 material. In-coupling prisms optimized for n = 2 (a) and n = 1.7 (b). Cross-sectional diagrams of illuminance (c) and luminous intensity (d). (e) Dependence of different angles on the refractive index.