Patent ID: 7701532

Claim:
A sight controllable display device, comprising: two polarizing plates; a display panel provided between the two polarizing plates; a modulator provided between the display panel and either one of the two polarizing plates; and an observing shutter, wherein: light is received by a first one of the two polarizing plates and then transmitted from a second one of the two polarizing plates to the observing shutter the display panel forms an image by changing transmittance of the light that transmits through the two polarizing plates; the modulator repeats an inversion mode for inverting the image formed on the display panel and a noninversion mode for not inverting the image; and the observing shutter is for observing the display panel, which repeats a translucent mode for transmitting the light and a shielding mode for not transmitting the light in connection with an action of the modulator.