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US 5,842,762 AGranted
Interlaced image projection apparatus
AssigneeU.S. Philips Corporation
InventorJohn A. Clarke
Life of this patent
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AssigneeU.S. Philips Corporation
InventorJohn A. Clarke
Estimating the term…
An image projection apparatus comprises an illumination unit (10), an image display unit (20), comprising a matrix display panel (22) having a row and column array of pixels (25), a projection lens (40) for projecting range produced by the display panel on to a screen (50) and an optical deflection unit (30) arranged between the display unit and the projection lens which is operable selectively to shift the light rays from a row of pixels passing therethrough whereby the pixel row images on the screen in one field are displaced and interlaced with the pixel row images of a preceding field. The image display unit (20) includes an array of lens elements (60) overlying the array of pixels whose effect is to reduce the height of the image of each pixel row in the projected display so the pixel row images of one field can fill the gaps between adjacent pixel row images of a preceding field without any substantial overlap and display panels having high aperture ratio can be utilised.
An image projection apparatus comprising an illumination unit, an image display unit having at least one image display panel comprising an array of pixels arranged in rows and columns and operable to produce a display image, a projection lens for projecting the image produced by the display unit on to a projection screen and an optical deflection unit arranged between the display unit and the projection lens, and which switches between two modes in which the light rays from rows of pixels of the display panel and passing through the deflection unit either are or are not shifted so as to displace the projected image of the rows of pixels on the projection screen, characterised in that the image display unit includes an array of lens elements overlying the array of pixels which lens elements are of such a form and arranged with respect to the pixel rows so as to reduce the height of the image of each pixel row in the projected display image.
Dependencies are inferred from the claim text.