Steven M. Penn

Method and apparatus for the computer-controlled manufacture of three-dimensional objects from computer data

An object produces from a computer data base by representing the object in the data base as a solid voxels surrounded by support voxels within a volume. The data base representation of the object as the solid voxels is converted to a data base representation of the object as a shell of solid voxels surrounding filler support voxels, and the object from said converted data base representation is constructed in a layerwise fashion. A first material is dispensed in liquid form at selected locations of a target surface, and the selected locations correspond to the shell locations of a cross-section of an object. The first material solidifies after being dispensed; a second material is applied at locations of said target surface other than the shell locations at which the first material is dispensed, to form another target surface. The dispensing and applying is repeated to form an object comprising a shell of the first material surrounding said second material, and surrounded by the second material. The portion of said second material surrounding said shell is removed, relative to the first material, to leave an object formed of a shell of the first material surrounding a portion of the second material.

40.2: Sequential Color Recapture and Dynamic Filtering: A Method of Scrolling Color

Scrolling color has long been a goal of the projector industry, as it enables the most efficient use of light in a single panel display. Current methods of implementing scrolling color use the techniques of splitting the light into primary colors, and manipulating that light on the modulator. The authors present the techniques of dynamic filtering and sequential color recapture (SCR) to achieve the same result with no moving components other than a color wheel, showing that the efficiency of 3-modulator systems can be approached with one modulator. Analysis of the technique applied to DLP™ projection displays, and results of prototype projection systems using the techniques, will be presented.

Advances in contrast enhancement for DLP projection displays

Increased contrast ratios are essential to the continued success of DLP products in the marketplace, from rear-projection televisions and home-theatre systems to large venue displays and DLP Cinema. The contrast of DLP projection systems has increased steadily over the past 5 years due to improvements in illumination and projection optics, as well as changes to the DMD itself. The authors will present an overview of the contrast performance of DLP projectors over time as well as describe illumination and projection techniques that optimize the performance of the DMD.

46.1: Invited Paper: Advances in Contrast Enhancement for DLP Projection Displays

Increased contrast ratios are essential to the continued success of DLP™ products in the marketplace, from rear projection televisions and home theatre systems to large venue displays and DLP Cinema™. The contrast of DLP projection systems has increased steadily over the past 5 years due to improvements in illumination and projection optics, as well as changes to the DMD itself. The authors will present an overview of contrast performance of DLP projectors over time as well as describe illumination and projection techniques that optimize the performance of the DMD.