| 摘要 |
PURPOSE:To correctly indicate a main image by superposing the flickering state of pixels to a main image on a liquid crystal panel kept at a light transmitting state by moving with a shift key and using the coordinate position of the flickering pixels as the positional information of the main image. CONSTITUTION:The liquid crystal panel 48 is obtained by arraying the pixels 50 formed by fine electrodes like a matrix. In case of indicating a main image, a pulse generated from an oscillator 49 is impressed at least to one pixel 50a corresponding to the main image to alternately change a transparent state and an opaque state every discriminatable period. Since no voltage is impressed to residual pixels except the pixel 50a, these pixels are kept at the transparent state. The hatched flickering pixel 50a can be moved to a required position through a keyboard so as to coincide with the main image 52 of a negative image.
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