| 摘要 |
PROBLEM TO BE SOLVED: To make a display on an upper display device more visible in a display device of a double structural body containing upper and lower display devices which overlap each other. SOLUTION: The upper display device 52 is constituted so as to dispose a display cell 56 on an optical valve 58. The double structural body is set in such a manner that, in the first state, the cell 56 and the valve 58 are transparent, the lower display device 54, therefore, is visible, in the second state, the cell 56 displays, the valve 58 becomes opaque and the lower display device 54, therefore, is partially shielded. In addition, the display cell 56 of the upper display device 52 becomes reflective in the switching state and the optical valve 58 is formed with a cell having the absorptive state in the switching state. |
