Patent ID: 6483235
Filing Date: 2002-11-19
Classification: H01J

Abstract:
An image display apparatus comprising:an anode substrate having a structure in which at least an image display portion is formed on a first substrate; a cathode substrate in which at least electron emission units are formed on a second substrate and which is disposed opposite to said anode substrate; and a plurality of spacers, each of which is formed into a substantially rectangular shape and which are stood erect between said anode substrate and said cathode substrate, wherein two long sides of each of said spacers are secured to at least either of said anode substrate or said cathode substrate, wherein said spacers are formed at a predetermined tension in a direction lengthwise of said spacers, wherein a thermal expansion coefficient of said spacer is defined &agr;s, a thermal expansion coefficient of said anode substrate or said cathode substrate on which said spacer stands erect is defined as &agr;g, a difference between a temperature of said spacer at which said spacer is stood erect and a temperature of said substrate when said spacer stands erect is defined as &Dgr;t1, a difference between a temperature at which said spacer is heated after said spacer has been stood erect and the temperature of said substrate when said spacer stands erect is defined as &Dgr;t2, a difference between a lowest temperature at which preservation is permitted and a temperature of said substrate when said spacer stands erect is defined as &Dgr;t3 and a maximum thermal expansion coefficient of said spacer within limit of pulling is &egr;, and wherein if &agr;s&lE;&agr;g, the following expression are satisfied: &agr;sÃ—&Dgr;t1+(&agr;gâˆ’&agr;s)Ã—&Dgr;t2&agr;sÃ—&Dgr;t1âˆ’(&agr;gâˆ’&agr;s)Ã—&Dgr;t3>0 if &agr;s&gE;&agr;g, the following expressions are satisfied: &agr;sÃ—&Dgr;t1+(&agr;gâˆ’&agr;s)Ã—&Dgr;t2>0 &agr;sÃ—&Dgr;t1âˆ’(&agr;gâˆ’&agr;s)Ã—&Dgr;t3