| 摘要 |
An optical display presenting a display field at least one digit in a seven segment arrangement, a stack of seven plate elements for each digit and arranged in a stack, a single light source directing light into the light inlet ends of all of the seven plates, a movable shutter element wth transparent and opaque areas movable across the light source and light inlets of the plates, each plate having a chamfered edge portion remote from the light inlet end and reflecting light transversely of the plate and onto the display field.
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