| 摘要 |
For displaying a target image contained in a sequence of first images ( 11 ) interspersed with second images ( 12 ) constituting a masking image, a display device is arranged for substantially exclusively displaying the first images and suppressing the second images in response to a key ( 13 ). The display device may be provided with an LCD screen which is only illuminated when first images are displayed. Color coding may be used to further enhance the security of the device.
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