Digital Driving Method for Low Frame Frequency and 256 Gray Scales in Liquid Crystal on Silicon Panels

Author

Kang, Jin-Seong ; Kwon, Oh-Kyong

Author_Institution

Div. of Electr. & Comput. Eng., Hanyang Univ., Seoul, South Korea

Volume

8

Issue

12

fYear

2012

Firstpage

723

Lastpage

729

Abstract

A liquid crystal on silicon (LCoS) panel for projector applications is developed using a new digital driving method to increase the gray scale of the projected image without increasing the driving frequency. The LCoS panel, which has a wide video graphics array (WVGA) resolution, is fabricated using 0.18 μm CMOS process technology with an area of 9600 μm × 5800 μm. The projection system is successfully demonstrated using the fabricated LCoS panel and the proposed digital driving method. The measured results of the projection system show that the proposed driving method achieves an 8-bit gray scale at a driving frequency of 75.6 MHz, which is less than 13.7% of the frequency in previously reported methods such as frame rate control and pulse width modulation.

Keywords

CMOS integrated circuits; computer graphics; driver circuits; image resolution; optical projectors; silicon; CMOS process technology; LCoS panel; WVGA resolution; digital driving method; frequency 75.6 MHz; gray scale; liquid crystal on silicon; projector application; size 0.18 mum; size 5800 mum; size 9600 mum; wide video graphics array; Arrays; Clocks; Image color analysis; Logic gates; Pulse width modulation; Shift registers; Timing; Digital driving method; SRAM type pixel; liquid crystal on silicon (LCoS); projector;

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2012.2220335

Filename

6355637