US 6,324,006 B1 · Spoke light recapture in sequential color imaging systems

Abstract

A method and display system for using the light (110) passing through the spokes of a color wheel (100). The light is a mixed and rapidly changing color. Adding all of the spoke times produces white, but adding a subset creates color artifacts. The spoke times cannot all be added at the same time without altering the white point of the display. The spoke times are added in a sequence and the sequence is altered over time for the same pixel such that the pixel converges to white over time. The pattern of spoke bits is arranged so that as adjacent spoke bit pixels are added, the net spoke light converges to white. The patterns are also varied so that as more and more spoke bit periods are turned on, the net spoke light converges to white. Each spoke bit period adds n-LSBs of white light intensity, so as each spoke bit period is added, n−1 LSBs of white light are subtracted from the white data.

Claims18

Dependent claims

A method of producing an image, said method comprising the steps of:

providing a sequential color beam of light, said sequential color beam of light changing color during each frame period, each frame period comprising:
at least two primary color periods;
and
at least one spoke period during which said sequential color beam of light changes color;
modulating said sequential color beam of light during said primary color periods with primary color intensity data;
modulating said sequential color beam of light during at least one said spoke period with combined-color intensity data;
and
focusing said modulated sequential color beam of light on an image plane to form a multi-color image.

5 more elements

Dependencies are inferred from the claim text.

Spoke light recapture in sequential color imaging systems

Life of this patent

Spoke light recapture in sequential color imaging systems

Life of this patent

Abstract

Claims18