Flat-panel display with intensity control to reduce light-centroid shifting

A flat-panel display comprising:

• a first plate structure comprising an electron-emissive region for emitting electrons;
• and
• a second plate structure comprising a light-emissive element for emitting light upon being struck by electrons, electrons emitted from the electron-emissive region striking the light-emissive element with an intensity having an electron-striking centroid along the second plate structure for causing the light-emissive element to emit light with an intensity having a light-emitting centroid along the second plate structure, the light-emissive centroid being shifted in a primary direction due to shifting of the electron-striking centroid in the primary direction, the light-emitting centroid also being shiftable in a further direction different from the primary direction, the display having a relative centroid shift ratio RP/RF where RP is (a) the amount of shift of the light-emitting centroid in the primary direction divided by (b) the accompanying amount of shift of the electron-striking centroid in the primary direction, and RF is (a) the amount that the light-emitting centroid is shiftable in the further direction divided by (b) the accompanying amount that the electron-striking centroid is shiftable in the further direction, the plate structures including means for causing relative centroid shift ratio RP/RF to be no more than 0.75 when the magnitudes of shift of the electron-striking centroid in the primary and further directions are respectively in primary and further shift ranges appropriate to the light-emissive element.

A flat-panel display comprising:

• a first plate structure comprising a two-dimensional array of electron-emissive regions for emitting electrons;
• and
• a second plate structure comprising a like-arranged two-dimensional array of light-emissive elements for emitting light upon being struck by electrons, the light-emissive elements respectively corresponding to the electron-emissive regions, electrons emitted from each electron-emissive region striking the corresponding light-emissive element with an intensity having an electron-striking centroid along the second plate structure for causing that light-emissive element to emit light with an intensity having a light-emitting centroid along the second plate structure, the intensities of electrons striking the light-emissive elements along imaginary planes extending in a primary direction through the centers of the light-emissive elements generally perpendicular to the second plate structure having a composite average intensity profile, the plate structures including means for causing the composite average intensity profile to have a local minimum such that ratio {overscore (R)}P of the amount of average shift of the light-emitting centroids in the primary direction to the amount of average attendant shift of the electron-striking-centroids in the primary direction is no more than 0.5 when the magnitude of average shift of the electron-striking centroids in the primary direction is in a shift range appropriate to the light-emissive elements.

A flat-panel display comprising:

• a first plate structure comprising a two-dimensional array of electron-emissive regions for emitting electrons;
• and
• a second plate structure comprising a like-arranged two-dimensional array of light-emissive elements for emitting light upon being struck by electrons, the light-emissive elements respectively corresponding to the electron-emissive regions, electrons emitted from each electron-emissive region striking the corresponding light-emissive element with an intensity having an electron-striking centroid along the second plate structure for causing that light-emissive element to emit light with an intensity having a light-emitting centroid along the second plate structure, the light-emitting centroids being shifted in a primary direction due to shifting of the electron-striking centroids in the primary direction, the light-emitting centroids being shiftable in a further direction different from the primary direction, the intensities of electrons striking the light-emissive elements along imaginary planes extending in the primary direction through the centers of the light-emissive elements generally perpendicular to the second plate structure having a composite average intensity profile, the plate structures including means for causing the composite average intensity profile to have a local minimum such that relative centroid shift ratio {overscore (R)}P/{overscore (R)}F is no more than 0.75 when the magnitudes of average shift of the electron-striking centroids in the primary and further directions are respectively in primary and further shift ranges appropriate to the light-emissive elements, where {overscore (R)}P is (a) the amount of the average shift of the light-emitting centroids in the primary direction divided by (b) the accompanying amount of average shift of the electron-striking centroids in the primary direction, and {overscore (R)}F is (a) the amount that the light-emitting centroids are averagely shiftable in the further direction divided by (b) the accompanying amount that the electron-striking centroids are averagely shiftable in the further direction.