Abstract: A light-emitting device with high emission efficiency and reliability is provided. The light-emitting device includes a fluorescent light-emitting layer and a phosphorescent light-emitting layer. A host material used in the fluorescent light-emitting layer has a function of converting triplet excitation energy into light emission and a guest material used in the fluorescent light-emitting layer emits fluorescence. The guest material has a molecular structure including a luminophore and a protecting group, and one molecule of the guest material includes five or more protecting groups. The introduction of the protecting groups into the molecule inhibits transfer of triplet excitation energy from the host material to the guest material by the Dexter mechanism. An alkyl group or a branched-chain alkyl group is used as the protecting group.

Abstract: An on-vehicle display device includes: an image display unit 6; wiring boards 8, 9 mounting a control circuit for controlling the image display unit 6; a magnesium alloy case 7 of which front recess receives the image display unit 6, and of which rear recess receives the wiring boards 8, 9; and a shield member 10 attached to the magnesium alloy case 7 for covering the rear recess. The magnesium alloy case 7 is thermally coupled to the image display unit 6 and works as a heat radiating device. The magnesium alloy case 7 is electrically coupled to the shield member 10 and works as an electromagnetic shield device together with the shield member 10.

Abstract: An on-vehicle display device includes: an image display unit 6; wiring boards 8, 9 mounting a control circuit for controlling the image display unit 6; a magnesium alloy case 7 of which front recess receives the image display unit 6, and of which rear recess receives the wiring boards 8, 9; and a shield member 10 attached to the magnesium alloy case 7 for covering the rear recess. The magnesium alloy case 7 is thermally coupled to the image display unit 6 and works as a heat radiating device. The magnesium alloy case 7 is electrically coupled to the shield member 10 and works as an electromagnetic shield device together with the shield member 10.