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US 2009/0072695 A1Published application
Image display device
AssigneeCanon Kabushiki Kaisha
InventorsTaro Hiroike, Akira Hayama, Takeshi Noda, Hideaki Mitsutake
Life of this patent
Estimating the term…
Abstract
This is to provide an image display device using a spacer 103 which can reduce an influence which charge has on an electron orbit greatly without depending on electroconductivity of the spacer 103 itself, and a characteristic of a material by making effectual charge amount zero by controlling positive and negative charge distributions generated on a surface of the spacer 103. This is an image display device using a spacer 103 on a main surface of which concavo-convex structure 106 is formed, the spacer 103 having the concavo-convex structure 106 which can cancel mutually positive charge in a convex portion of the concavo-convex structure 106, and negative charge in a concave portion.
Claims19
An image display device which has:
- a first substrate that has an electron source which includes a plurality of electron-emitting devices;
- a second substrate which has an acceleration electrode for accelerating electrons, emitted from the electron source, and is arranged opposite to the first substrate;
- and
- a spacer which is arranged between the first substrate and the second substrate, and specifies a gap of the first substrate and the second substrate, characterized in that the spacer has concavo-convex structure in its main surface, and fulfills the following relational expressions with a length of a concave portion of the concavo-convex structure in a direction to the second substrate from the first substrate be A, a length of a convex portion be B, a secondary electron emission coefficient of the concave portion be δA, a secondary electron emission coefficient of the convex portion be δB, a probability of an electron being incident into the concave portion and being trapped by the concave portion be α, a depth of the concave-convex structure be d, and electric field strength between the first substrate and the second substrate during operation of the image display device be E.
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74 more elements
An image display device which has:
- a first substrate that has an electron source which includes a plurality of electron-emitting devices;
- a second substrate which has an acceleration electrode for accelerating electrons, emitted from the electron source, and is arranged opposite to the first substrate;
- and
- a spacer which is arranged between the first substrate and the second substrate, and specifies a gap of the first substrate and the second substrate, characterized in that the spacer has concavo-convex structure in its main surface, a length of a concave portion of the concavo-convex structure in a direction to the second substrate from the first substrate be A, a length of a convex portion be B, a concavo-convex ratio A/B becomes large gradually from a side of the first substrate toward a side of the second substrate.
1 more element
An image display device which has:
- a first substrate that has an electron source which includes a plurality of electron-emitting devices;
- a second substrate which has an acceleration electrode for accelerating electrons, emitted from the electron source, and is arranged opposite to the first substrate;
- and
- a spacer which is arranged between the first substrate and the second substrate, and specifies a gap of the first substrate and the second substrate, characterized in that the spacer has concavo-convex structure in its main surface, the concavo-convex structure includes a plurality of concavo-convex shapes where maximum angle of inclinations of inclined planes are different, and the maximum angle of inclination of the concavo-convex shape formed in an area in a side of the first substrate is larger than the maximum angle of inclination of the concavo-convex shape formed in an area in a side of the second substrate.
1 more element
An image display device which has:
- a first substrate that has an electron source which includes a plurality of electron-emitting devices;
- a second substrate which has an acceleration electrode for accelerating electrons, emitted from the electron source, and is arranged opposite to the first substrate;
- and
- a spacer which is arranged between the first substrate and the second substrate, and specifies a gap of the first substrate and the second substrate, characterized in that the spacer has an concavo-convex structure, where a plurality of concavo-convex shapes are formed periodically, in its main surface, and a cycle of the concavo-convex shape in a side of the second substrate is longer than one in a side of the first substrate.
1 more element
An image display device which has:
- a first substrate that has an electron source which includes a plurality of electron-emitting devices;
- a second substrate which has an acceleration electrode for accelerating electrons, emitted from the electron source, and is arranged opposite to the first substrate;
- and
- a spacer which is arranged between the first substrate and the second substrate, and specifies a gap of the first substrate and the second substrate, characterized in that the spacer has concavo-convex structure in its main surface, the concavo-convex structure includes a plurality of concavo-convex shapes whose depths are different, and the depth of the concave-convex shape formed in an area in a side of the first substrate is deeper than the depth of the concave-convex shape formed in an area in a side of the second substrate.
1 more element
Dependencies are inferred from the claim text.