Patent ID: 6703791
Filing Date: 2004-03-09
Classification: H01J

Abstract:
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 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 part higher than said lower voltage electrodes, and wherein a height h (&mgr;m) 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 (&mgr;m), 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 (&mgr;m) and a distance from the electron-emitting areas and one unit end is &Dgr;Px (&mgr;m): (Va/d)Ã—&bgr;h>Vf h<(A+(BÃ—In(2Lo/(Pxâˆ’2&Dgr;Px)))0.5)/&bgr;â€ƒwhere A is represented by the following expression with a width W (&mgr;m) of the part of said higher voltage electrode higher than the surfaces of said lower voltage electrodes as a parameter: A=âˆ’0.5&agr;W+26.2 â€ƒwhere Lo (&mgr;m) is a curvilinear progression quantity of electron beams and is represented by the following expression: Lo=2Kd(Vf/Va)0.5 â€ƒwhere K and B are constants and &agr; and &bgr; are correction factors depending on a shape of said higher voltage electrode.