There mainly is laser digital photofinishing technique and digital photofinishing technique based on LCD
consisting of TFT and LCOS in the digital photofinishing field at the present time. The former have a good many
merit such as wide color gamut, high processing rate, large output size and high brightness, but his cost is very high,
his maintain technique being comparatively complex, that result in difficult use for people. The utilization ratio of
the latter is low because of lower resolution and lower aperture ratio for LCD, but the digital photofinishing based
on LCD have lower cost and higher utilization ration, being suitable for people's current standard of living.
Considering above mentioned problem, a micro-motion exposure method based on PZT piezoelectric ceramics
used in digital image photofinishing is presented. The two-dimension micro-motion exposure system consisting of
PZT piezoelectric ceramics, LCD panel, polarizing film and spring strip is designed. By means of PZT
piezoelectric ceramics the LCD panel is removed about the one half of the pixel size of the LCD panel for four
times from the original place, at the same time imaging system is exposed four times at the printing paper. The
software is used to control the time synchronization, the exposure time and motion range of the LCD panel. The
system has advantages such as shorter response time than 0.1seconds, lesser motion error than 0.01 microns, high
stability and repeatability. Experimental results show that the proposed micro-motion exposure method improve the
picture brightness and enlarge output size, at the meantime reducing the cost of the system.