A display device for displaying information is provided with an optical system for guiding the light of the display device to the eye, the optical system having, in the order in the proceeding direction of the light, an entrance face for receiving the light, a curved face for totally reflecting the light and a reflecting face concave to the eye side and adapted to reflect the light toward the eye. The reflected light is transmitted by the curved face and reaches the eye. Thus there is obtained a compact display device with satisfactorily suppressed aberrations.

 
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< Information processing apparatus and notification method therefor, program for implementing the method, and storage medium storing the program

> Unit for tone-processing image data using screen pattern with different screen angles for toners of same hue and different density

> Moving apparatus

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