Eyepiece for a personal display and personal display comprising such eyepiece

A personal display device comprising:

• a display element, and
• an eyepiece for projecting an image from the display element to an eye of a viewer,
• the eyepiece comprising:
• a stationary lens group and two movable lens groups being movable with respect to the stationary lens group along an optical axis between the image plane and the exit pupil,
• wherein the lens groups are arranged in positive-negative-positive configuration and the movable lens groups are arranged to move along the optical axis between a first state providing a first field-of-view and a second state providing a second field-of-view smaller than the first field-of-view to the image plane wherein the eyepiece is adapted to provide an image of essentially equally sized area of the image plane at said exit pupil in said first and second states,
• wherein the lens groups comprise:
• a first movable positive lens group located closest to the exit pupil,
• a third stationary positive lens group located closest to the image plane, and
• a second movable negative lens group between the first lens group and the third lens group,
• whereby the first lens group and the second lens group are adapted to move farther from the third lens group and closer to each other when moving from the first state to the second state,
• whereby the display element is positioned at said image plane.