| 摘要 |
In an image display apparatus in which an electron-emitting device is used, an image having high brightness and high contrast is formed while color drift is decreased to form the image having good color purity by suppressing halation. Assuming that a thickness is set at T 1 in a portion corresponding to a center portion 9 of a phosphor member 6 and a thickness is set at T 2 in a portion corresponding to a peripheral portion 10 of a phosphor member 6 , a relationship of T 1 <T 2 is met for the thickness of an accelerating electrode 7 . Therefore, in the scattered electrons incident to the phosphor member 6 again, the scattered electron incident to the peripheral portion 10 of the phosphor member 6 has the large energy loss when the scattered electron is transmitted through the accelerating electrode 7 , and halation brightness is decreased in the whole of the phosphor member 6 . In the accelerating electrode 7 , because the thickness T 1 of the portion corresponding to the center portion 9 of the phosphor member 6 is kept thin, the electron energy possessed by the electron emitted from the electron-emitting device 4 when the electron is incident to the phosphor member 6 is kept high. Accordingly, the brightness of the bright spot is not decreased.
|
