PLANE-TYPE LUMINESCENT DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To reduce temperature increase caused by heat radiation of a device's internal component such as a heat source, by forming an inner surface of a light emitting element of a metallic casing and a driving circuit with material having a far infrared absorption factor exceeding a specific ratio. SOLUTION: A means for improving a far infrared absorption factor is provided on the inner surface or both surfaces of a metallic casing 4a. For example, an alumite treatment of the surface of the metallic casing 4a can also improve the far infrared absorption factor up to 40%. Black coating of a device's inner surface of the metallic casing 4a can also improve the far infrared absorption factor to 15%. The metallic casing 4a using these means absorbs far infrared radiation occurring in a display device such as a display element 1 and an electric component on a driving circuit board 2 on the inner surface side of the device of the metallic casing 4a. Thus, an amount of the far infrared radiation that has reflected by the metallic casing 4a can be suppressed. Therefore, the absorption amount of the far infrared radiation absorbed by a heat source such as the display device 1 or the electric component on the driving circuit board 2 reduces.