| 摘要 |
PROBLEM TO BE SOLVED: To provide a display device having excellent visibility for the change amount in a quantitative value. SOLUTION: In the device, the light emitted from each light source L is diffracted by a plurality of minute optical devices concentrically formed on an optical member 3 to produce ray images P stretching in the radial direction from the center of the curvature. A specified quantitative value is displayed as an analog value by the ray images P. When a light source L(k+ 3) (or the light source L(k+ 5)) corresponding to a specified velocity is to be turned on, the number of light sources L(k) to L(k+ 5) to be turned on near the light source L(k+ 3) (or light source L(k + 5)) is varied according to the change amount of the velocity.
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