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A High-Resolution Projection Display Based on Silicon Light Valves

A High-Resolution Projection Display Based on Silicon Light Valves. P W Cheng , H C Huang and H S Kwok Centre for Display Research Department of Electrical and Electronic Engineering The Hong Kong University of Science & Technology. Outline. Silicon Light Valve XGA Display Features

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A High-Resolution Projection Display Based on Silicon Light Valves

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  1. A High-Resolution Projection Display Based on Silicon Light Valves P W Cheng, H C Huang and H S Kwok Centre for Display Research Department of Electrical and Electronic Engineering The Hong Kong University of Science & Technology

  2. Outline • Silicon Light Valve • XGA Display Features • Optical Engine • Conclusion

  3. Characteristics and Topography • Fine pixels on the top as reflective mirrors • All the electronics are beneath the mirrors • Light shield and surface planarization

  4. Silicon Advantages • Full driver Integration and fine pixels • High fill factor • Mature silicon VLSI technology

  5. 9.6 mm pixels 86% fill factor Virtual Reality 13.8 mm pixels 91% fill factor Projection SEM Pictures of Fine Pixels

  6. Effect of Pixel Size on Optical Performance(Comparison between theory and experiment)

  7. Fabrication Flow • Front-end for electrical functions • Full integration of display drivers • Pixels of high breakdown voltage • Standard 0.5 mm CMOS process • Back-end for optical performance • Surface planarization and light shield • Pixels of high fill factor • Modified 0.35 mm process

  8. HKUST-XGA Panel Specifications • Resolution: 1024 x 768,13.8mmpixels • Fill factor: 91% • Reflectivity: 90% (dielectric mirror) • Process: 0.5mm FE/0.35mm BE • Data driver: 6-bit, 2 channels • LC Mode: MTB NW or NB • Others: Built-in gamma corrections

  9. Functional Block Diagram QA1 BIT1 SHR CLK1 DISP1 ODD_DATA (0:5) ODD-COLUMN DATA DRIVERS D/A CONVERTERS SCLK FLM SCAN_DN V1, V2, V3, V4 VG1, VG2, VG3,VG4 VB1, VB2 FRAME REFERENCE VOLTAGE GENERATOR SCAN DRIVERS 1024 x 768 PIXEL ARRAY SOUT VCC, VDD, VDD2 GND SHIELD D/A CONVERTERS CLK2 DISP2 EVEN_DATA (0:5) EVEN-COLUMN DATA DRIVERS BIT2 • Almost identical to TFT panel with full driver integration

  10. Fine and Resolvable Pixels • Advantage of digital driving scheme

  11. Reflectance-vs-Voltage Curves Contrast Ratios: Red 169:1 Green 101:1 Blue 68:1 White 108:1 • Wide-band MTB NW mode for three primary colors

  12. VG3 VG4 VG1 VG2 Gamma Correction • Fine tune of linear gray scale for three primary colors

  13. Optical Engine A B-LCD C PBS D G-LCD B MH Lamp R-LCD • Trichroic prism assembly (TPA) • 16o incident angle(patent pending) • H. S. Kwok etal, to be published on Applied Optics, 1999

  14. Good Color Fidelity forTPA - Experimental Results • Negligible S-P Polarization Split

  15. Measured color coordinates Includes the effects of the halogen light source and the TPA

  16. Good Color Saturation by the Optical Engine

  17. Linear Gray Scale by g-correction

  18. Projected Image on the Screen

  19. Projector Prototype Specifications

  20. Conclusions • Highly Integrated Silicon Light Valve • Front-end for electrical functions • Back-end for optical optimization • XGA Projection Display Features • Fine and resolvable pixels • Linear gray scale • Good color saturation

  21. Acknowledgements • Dr. Steve Yeung and Mr. George Lee of Varitronix (HK) for making LC cells • Sponsored by Industry Department of Hong Kong Government

  22. Screen END (of IDRC99)

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