1 / 22

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

jessica-george
Download Presentation

A High-Resolution Projection Display Based on Silicon Light Valves

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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)

More Related