Electron emission device with a grid electrode

An electron emission device comprising:

• a first substrate and a second substrate facing one another and having a predetermined gap therebetween;
• an electron emission region for emitting electrons formed on the first substrate;
• an illumination portion for displaying images responsive to the electrons emitted from the electron emission region formed on the second substrate;
• and
• a grid electrode mounted between the first and second substrates and configured to focus the electrons emitted from the electron emission region toward the illumination portion,
• wherein the grid electrode is provided with a plurality of electron passage openings, at least one of the electron passage openings having an interior wall, the interior wall having at least one portion formed with an inclined plane relative to the first substrate,
• wherein the at least one of the electron passage openings has a cross section taken longitudinally along a diameter of the at least one of the electron passage openings, the cross section forming an inclined plane tapered downward toward the first substrate, and
• wherein the inclined plane is formed as a curved plane.

An electron emission device comprising:

• a first substrate and a second substrate facing one another and having a predetermined gap therebetween;
• an electron emission region, for emitting electrons, on the first substrate;
• an illumination portion, for displaying images responsive to the electrons emitted from the electron emission region, on the second substrate;
• and
• a grid electrode mounted between the first and second substrates and configured to focus the electrons emitted from the electron emission region toward the illumination portion,
• wherein the grid electrode is provided with a plurality of electron passage openings, at least one of the electron passage openings having an interior wall, the interior wall having at least one portion formed with an inclined plane relative to the first substrate,
• wherein the grid electrode has bridge portions interconnecting the electron passage openings, and each of the bridge portions has a smaller width portion at an upper portion of the electron passage openings toward the second substrate and a larger width portion at a lower portion of the electron passage openings toward the first substrate, and
• wherein a ratio of the smaller width portion to the larger width portion is within about 0.2 to 0.5.

An electron emission device comprising:

• a first substrate and a second substrate facing one another and having a predetermined gap therebetween;
• an electron emission region, for emitting electrons, on the first substrate;
• an illumination portion, for displaying images responsive to the electrons emitted from the electron emission region, on the second substrate;
• and
• a grid electrode mounted between the first and second substrates and configured to focus the electrons emitted from the electron emission region toward the illumination portion,
• wherein the grid electrode is provided with a plurality of electron passage openings, at least one of the electron passage openings having an interior wall, the interior wall having at least one portion formed with an inclined plane relative to the first substrate,
• wherein the grid electrode has bridge portions interconnecting the electron passage openings, and each of the bridge portions has a smaller width portion at an upper portion of the electron passage openings toward the second substrate and a larger width portion at a lower portion of the electron passage openings toward the first substrate, and
• wherein a ratio of the smaller width portion to a total depth of the at least one of the electron passage openings is above about 0.2.

An electron emission device comprising:

• a first substrate and a second substrate facing one another and having a predetermined gap therebetween;
• an electron emission region, for emitting electrons, on the first substrate;
• an illumination portion, for displaying images responsive to the electrons emitted from the electron emission region, on the second substrate;
• and
• a grid electrode mounted between the first and second substrates and configured to focus the electrons emitted from the electron emission region toward the illumination portion,
• wherein the grid electrode is provided with a plurality of electron passage openings, at least one of the electron passage openings having an interior wall, the interior wall having at least one portion formed with an inclined plane relative to the first substrate,
• wherein the grid electrode has bridge portions interconnecting the electron passage openings, and each of the bridge portions has a smaller width portion at an upper portion of the electron passage openings toward the second substrate and a larger width portion at a lower portion of the electron passage openings toward the first substrate,
• wherein at least one of the bridge portions has a plurality of inclined planes having at least two slope changes along a depth direction of the at least one of the bridge portions, and
• wherein the inclined plane formed at one side surface of the at least one of the bridge portions has a smaller slope at the upper portion than that at the lower portion.

An electron emission device comprising:

• a first substrate and a second substrate facing one another and having a predetermined gap therebetween;
• an electron emission region, for emitting electrons, on the first substrate;
• an illumination portion, for displaying images responsive to the electrons emitted from the electron emission region, on the second substrate;
• and
• a grid electrode mounted between the first and second substrates and configured to focus the electrons emitted from the electron emission region toward the illumination portion,
• wherein the grid electrode is provided with a plurality of electron passage openings, at least one of the electron passage openings having an interior wall, the interior wall having at least one portion formed with an inclined plane relative to the first substrate,
• wherein the grid electrode has bridge portions interconnecting the electron passage openings, and each of the bridge portions has a smaller width portion at an upper portion of the electron passage openings toward the second substrate and a larger width portion at a lower portion of the electron passage openings toward the first substrate,
• wherein at least one of the bridge portions has a plurality of inclined planes having at least two slope changes along a depth direction of the at least one of the bridge portions, and
• wherein a first ratio, As/Bw, of a first horizontal element, As, of one of the inclined planes formed at one side of the at least one of the bridge portions to a total width, Bw, of the at least one of the bridge portions and a second ratio, Cs/Bw, of a second horizontal element, Cs, of another one of the inclined planes formed at another side of the at least one of the bridge portions to the total width, Bw, of the at least one of the bridge portions are each respectively within about 0.3 to 0.7.