Nippon Seiki Co., Ltd.

Takeshi Yachida

Takashi Yamazoe

Takuro Hirokawa

Tsuyoshi Kawaguchi

Minoru Takebe

Yuuki Masuya

Provided is a head up display device with which it is possible to adjust the projection location of display light depending on the height of the observer's point of view, without moving the virtual image in the vertical direction. This head up display device is provided with: a case which retains a display and a concave mirror in a prescribed positional relationship; a first driving means which rotates the concave mirror; a second driving means which moves the case frontward and rearward; and a control means which operates the first and second drive means in accordance with information about the viewpoint position of the observer, and adjusts the projection location of display light (L) on front glass depending on the height of the observer's point of view.

Head up display device

Provided are a drive device and drive method for a vacuum fluorescent display that can suppress brightness variations in display images and improve display quality. A drive device for a vacuum fluorescent display is provided with a positive electrode unit in which a plurality of positive electrodes to which a phosphor is applied are disposed in a matrix shape and a negative electrode filament that discharges electrons toward the positive electrode unit. The device is provided with: a first magnetic field generating means that generates a first magnetic field perpendicular to the direction in which the positive electrode unit and the negative electrode filament face each other and that can periodically switch polarity; and a second magnetic field generating means that generates a second magnetic field that is perpendicular to the direction in which the positive electrode unit and the negative electrode filament face each other and crosses the first magnetic field and that can periodically switch polarity.

Drive device and drive method for vacuum fluorescent display

A display device compresses light-emitting display of modifiable display luminance; a light sensor for detecting the surrounding brightness; and a control for adjusting the display brightness of the light-emitting display in response to a brightness value based on detected results of the brightness sensor. If absolute value of the difference between current and previously determined brightness values is less than a prescribed threshold value, the control determines that there is no change in brightness otherwise the central determines that there has been a change in brightness. Upon a determination of a predetermined number of times that a brightness change has occurred, the display luminance is adjusted in response to the current brightness value.

Display device and control method for same

Provided is a head-up display device that can detect background brightness with a simple constitution. A HUD device () is provided with: a display device () that outputs display light (L) that shows a display image; a combiner () that has a concave surface () to which the display light (L) output by the display device () is incident, said combiner () concentrating the incident display light (L) so as to allow an observer () to see the display image from the concave surface () side superimposed on a background from the front; and an optical sensor () that is positioned below the combiner () and detects the brightness of the light reaching that optical sensor (). The combiner () has a light guide body () which is at the lower edge part thereof and is integrated with the combiner (). The light guide body () has a facing surface () facing the optical sensor () in the vertical direction and guides external light incident from the front downward, outputting the guided light from the facing surface (). The optical sensor () detects the brightness of the light output from the facing surface ().

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Niigata, Japan

Takeshi Yachida