| 摘要 |
PROBLEM TO BE SOLVED: To reduce deterioration of brightness with the elapse of time by arranging a plurality of non-evaporation getters on at least one substrate of two facing substrates, activating the non-evaporation getters, heating an entire air- tight container, and selectively heating the non-evaporation getters. SOLUTION: An electron source substrate 1 is provided with a plurality of electron emitting elements and with wiring. A rear plate 2, a support frame 3, and a face plate 4 forms an envelope 5. Non-evaporation getter films 9 are arranged on almost the entire surface on the upper wiring for Doxm in an image display region. Continuing exhaust of the envelope 5, an image forming device and a vacuum container are entirely held for 10 hours, for example, at 300 deg.C by a heating device. Subsequently, the entire image forming device is heated, for example, to 200 deg.C, and simultaneously, for example, 0.46 A current is made to flow through the upper wiring, temperature of the wiring is set to be 400 deg.C for 10 minutes, and thereby, the non-evaporation getter films 9 on the wiring are activated.
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