Optical reconstruction filter for color mosaic displays

Claim 1

An improved flat panel color mosaic (or matrix) display apparatus which uses a diffraction grating reconstruction filter to reduce image artifacts, the apparatus comprising: a flat panel color matrix display, the flat panel color matrix display having a viewing face and comprising a regular structure of pixels which are selectively energized to create an image having high frequency energy, the color matrix display being subject to an inherent underlying grid structure which results in objectionable visual artifacts called sampling noise which lowers image quality; and a two-dimensional diffraction grating reconstruction filter positioned proximate and in front of said matrix display viewing face which diffracts the image to substantially filter the image, the diffraction grating breaking each pixel image up into various diffraction orders in two-dimensions as it passes through the grating, whereby the diffracted pixels overlap and cause interpolation among the pixels thereby minimizing the high frequency energy and detection of the underlying grid structure and improving the image.

Claim 28

A method for designing a diffraction grating optical reconstruction filter for a color mosaid (or matrix) display comprising the steps: providing a flat panel two-dimensional color matrix display having regular structures of color pixels of a plurality of primary colors, said flat panel display having an inherent underlying grid structure which results in objectionable visual artifacts in the display commonly referred to as sampling noise; specifying each primary color lattice in the display; determining Nyquist boundaries in two-dimensions; applying the Nyquist boundaries to define the extent of traditional interpolation functions and therefore the filter cutoff requirements; embodying these interpolation functions in the form of a phase diffraction grating; and applying the phase diffraction grating over the surface of the color matrix display to alter the point spread function of each pixel.

Claim 29

A method for designing a diffraction grating optical reconstruction filter for a color mosaid (or matrix) display comprising the steps: providing a flat panel two-dimensional color matrix display having regular structures of color pixels of a plurality of primary colors, said flat panel display having an inherent underlying grid structure which results in objectionable visual artifacts in the display commonly referred to as sampling noise; specifying each primary color lattice in the display; determining Nyquist boundaries in two-dimensions; applying the Nyquist boundaries to define the extent of traditional interpolation functions and therefore the filter cutoff requirements; embodying these interpolation functions in the form of a phase diffraction grating; and applying the phase diffraction grating over the surface of the color matrix display to alter the point spread function of each pixel.

Claim 30

A method for designing a diffraction grating optical reconstruction filter for a color mosaic (or matrix) display comprising the steps: providing a flat panel two-dimensional color matrix display having regular structures of color pixels of a plurality of primary colors, said flat panel display having an inherent underlying grid structure which results in objectionable visual artifacts in the display commonly referred to as sampling noise; specifying each primary color lattice in the display; determining lattice as defined by each primary color alone; determining spatial frequency pattern of lattice by taking Fourier Transform; determining Nyquist boundaries by, circumscribing a region having a region shape by drawing a ray from a reference point to each nearest neighbor point, at midpoint of each ray drawing a perpendicular bisector line, said rays together forming a collection of perpendicular bisectors, the region circumscribed is maximum frequency capability of the color mosaic display, the collection of perpendicular bisectors comprise the Nyquist boundaries themselves; select interpolation waveform, one dimensional; making one dimensional waveform into two dimensional waveform by rotating it through two dimensions and by adjusting its relative extent in accordance with the shape of the region circumscribed by the Nyquist boundaries thereby defining the desired point spread function of the grating in combination with the eye; making the grating have point spread function minus the impact of the eye; and, placing the grating over the panel at a distance t.

Claim 31

A method for designing a diffraction grating optical reconstruction filter for a color mosaic (or matrix) display comprising the steps: providing a flat panel two-dimensional color matrix display having regular structures of color pixels of a plurality of primary colors, said flat panel display having an inherent underlying grid structure which results in objectionable visual artifacts in the display commonly referred to as sampling noise; specifying each primary color lattice in the display; determining lattice as defined by each primary color alone; determining spatial frequency pattern of lattice by taking Fourier Transform; determining Nyquist boundaries by, circumscribing a region having a region shape by drawing a ray from a reference point to each nearest neighbor point, at midpoint of each ray drawing a perpendicular bisector line, said rays together forming a collection of perpendicular bisectors, the region circumscribed is maximum frequency capability of the color mosaic display, the collection of perpendicular bisectors comprise the Nyquist boundaries themselves; select interpolation waveform, one dimensional; making one dimensional waveform into two dimensional waveform by rotating it through two dimensions and by adjusting its relative extent in accordance with the shape of the region circumscribed by the Nyquist boundaries thereby defining the desired point spread function of the grating in combination with the eye; making the grating have point spread function minus the impact of the eye; and, placing the grating over the panel at a distance t.