Image display device

An image display device comprising:

• an electron source and a display member for displaying an image by irradiation with electrons emitted from said electrons source,
• wherein said electron source has a plurality of units provided with a higher voltage electrode disposed on a substrate, lower voltage electrodes provided in parallel on both sides of said higher voltage electrode across said higher voltage electrode and electron-emitting areas located between each of said lower voltage electrodes and said higher voltage electrode, electron beams emitted from each of said electron-emitting areas in each unit cross with each other, and said higher voltage electrode has a surface whose height gradually increases or rapidly increases from said electron-emitting area side and has a part higher than said lower voltage electrode, and
• wherein a height h (μm) of said higher voltage electrode from surfaces of said lower voltage electrodes meets the following expressions when an interval between said substrate and an anode electrode provided on said display member is d (μm), a potential difference between said higher voltage electrode and said lower voltage electrodes is Vf (V), a potential difference between said anode electrode and said lower voltage electrodes is Va (V), a pitch width in a direction of one unit of higher voltage electrode and lower voltage electrodes is Px (μm) and a distance from the electron-emitting areas and one unit end is ΔPx (μm):
• (Va/d)×βh>Vf
• h<(A+(B×In(2Lo/(Px−2ΔPx)))0.5)/β
• where A is represented by the following expression with a width W (μm) of the part of said higher voltage electrode higher than the surfaces of said lower voltage electrodes as a parameter:
• A=−0.5αW+26.2
• where Lo (μm) is a curvilinear progression quantity of electron beams and is represented by the following expression:
• Lo=2Kd(Vf/Va)0.5
• where K and B are constants and α and β are correction factors depending on a shape of said higher voltage electrode.

An image display device comprising:

• an electron source and a display member for displaying an image by irradiation with electrons emitted from said electron source,
• wherein said electron source has a plurality of units provided with a higher voltage device electrode disposed on a substrate, lower voltage device electrodes provided in parallel on both sides of said higher voltage device electrode across said higher voltage device electrode, electron-emitting areas located between each of said lower voltage device electrodes and said higher voltage device electrode and a wiring electrode connected to and disposed on said higher voltage device electrode, electron beams emitted from each of said electron-emitting areas in each unit cross with each other, and said wiring electrode has a part higher than said lower voltage device electrodes, and
• wherein a height of h (μm) of said wiring electrode from surfaces of said lower voltage device electrodes meets the following expressions when an interval between said substrate and an anode electrode provided on said display member is d (μm), a potential difference between said higher voltage device electrode and said lower voltage device electrodes is Vf(V), a potential difference between said anode electrode and said lower voltage device electrodes is Va(V), a pitch width in a direction of one unit of higher voltage device electrode and lower voltage device electrodes is Px (μm) and a distance from the electron-emitting areas and one unit end is ΔPx (μm):
• (Va/d))×βh>Vf
• h<(A+(B×In(2Lo/(Px−2ΔPx)))0.5)/β
• where A is represented by the following expression with a width W (μm) of the part of said wiring electrode higher than the surfaces of said lower voltage electrodes as a parameter:
• A=−0.5αW+26.2
• where Lo (μm) is a curvilinear progression quantity of electron beams and is represented by the following expression:
• Lo=2Kd(Vf/Va)0.5
• where K and B are constants and α and β are correction factors depending on a shape of said wiring electrode.

An image display device comprising:

• an electron source and a display member for displaying an image by irradiation with electrons emitted from said electron source,
• wherein said electron source has a plurality of units provided with a higher voltage device electrode disposed on a substrate, lower voltage device electrodes provided in parallel on both sides of said higher voltage device electrode across said higher voltage device electrode, electron-emitting areas located between each of said lower voltage device electrodes and said higher voltage device electrode and a wiring electrode connected to and disposed on said higher voltage device electrode, electron beams emitted from each of said electron-emitting areas in each unit cross with each other, and a step is formed by said higher voltage device electrode and said wiring electrode and said wiring electrode has a part higher than said lower voltage device electrodes, and
• wherein a height of h (μm) of said wiring electrode from surfaces of said lower voltage device electrodes meets the following expressions when an interval between said substrate and an anode electrode provided on said display member is d (μm), a potential difference between said higher voltage device electrode and said lower voltage device electrodes is Vf(V), a potential difference between said anode electrode and said lower voltage device electrodes if Va(V), a pitch width in a direction of one unit of higher voltage device electrode and lower voltage device electrodes is Px (μm) and a distance from the electron-emitting areas and one unit end is ΔPx (μm):
• (Va/d)×βh>Vf
• h<(A+(B×In(2Lo/(Px−2ΔPx)))0.5)/β
• where A is represented by the following expression with a width W (μm) of the part of said wiring electrode higher than the surfaces of said lower voltage electrodes as a parameter:
• A=−0.5αW+26.2
• where Lo (μm) is a curvilinear progression quantity of electron beams and is represented by the following expression:
• Lo=2Kd(Vf/Va)0.5
• where K and B are constants and α and β are correction factors depending on a shape of said wiring electrode.