| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a display element capable of displaying three or more gradations by a single element, in which a reflectance is high during white display and colored display and the contrast between white display or colored display and black display is high. <P>SOLUTION: A display element comprises a metal layer 4, a transparent layer body 3, a first transparent conductive layer 5, an electrolyte layer 6, and a second transparent conductive layer 7. The display element is constituted such that, assuming that a real part of the refraction factor of the metal layer 4 is n<SB POS="POST">1</SB>, an imaginary part thereof is k<SB POS="POST">1</SB>, an average of a real part of the refraction factor of the transparent layer body 3 is n, an average of an imaginary part thereof is k, a real part of the refraction factor of the electrolyte layer is n<SB POS="POST">2</SB>, an imaginary part thereof is k<SB POS="POST">2</SB>, a real part of the refraction factor of a translucent metal layer 8 deposited by applying a prescribed voltage to the first transparent conductive layer 5 is n<SB POS="POST">3</SB>, and an imaginary part thereof is k<SB POS="POST">3</SB>, the following formulae are satisfied:(r<SB POS="POST">1</SB><SP POS="POST">2</SP>+r<SB POS="POST">2</SB><SP POS="POST">2</SP>+2r<SB POS="POST">1</SB>r<SB POS="POST">2</SB>)/(1+(r<SB POS="POST">1</SB>r<SB POS="POST">2</SB>)<SP POS="POST">2</SP>+2r<SB POS="POST">1</SB>r<SB POS="POST">2</SB>)≥0.45, (r<SB POS="POST">1</SB><SP POS="POST">2</SP>+r<SB POS="POST">2</SB><SP POS="POST">2</SP>+2r<SB POS="POST">1</SB>r<SB POS="POST">2</SB>)/(1+(r<SB POS="POST">1</SB>r<SB POS="POST">2</SB>)<SP POS="POST">2</SP>+2r<SB POS="POST">1</SB>r<SB POS="POST">2</SB>)/(r<SB POS="POST">1</SB><SP POS="POST">2</SP>+r<SB POS="POST">3</SB><SP POS="POST">2</SP>+2r<SB POS="POST">1</SB>r<SB POS="POST">3</SB>)/(1+(r<SB POS="POST">1</SB>r<SB POS="POST">3</SB>)<SP POS="POST">2</SP>+2r<SB POS="POST">1</SB>r<SB POS="POST">3</SB>)≥2, and k<0.04. <P>COPYRIGHT: (C)2012,JPO&INPIT |
