CPC Class H04N

An electric field sensor has a semiconductor stack, a first electrode, and a second electrode. The semiconductor stack includes a first semiconductor layer of a first conductive type and a second semiconductor layer of a conductive type opposite to the first conductive type stacked on the first semiconductor layer. The first electrode is arranged on one side of the semiconductor stack in the lamination direction. The second electrode is arranged on the other side of the semiconductor stack in the lamination direction. The electric field sensor detects the intensity of an electric field in the direction orthogonal to the lamination direction based on a current passing through the semiconductor stack.

A projection lens included in a projector using laser beams as a light source is provided, the laser beams including as the light source, first blue laser light beams, second blue laser beams, first green laser beams, second green laser beams, first red laser beams, and second red laser beams, which are different in wavelength range. The projection lens has a relative maximum value of a transmittance on an optical axis between a wavelength not shorter than 645 nm and a wavelength not longer than 680 nm.

An information processing terminal device includes: an acquiring unit acquiring image data; a detecting unit detecting a posture of the information processing terminal device; a generating unit generating display image data based on the image data acquired in the acquiring unit according to the posture of the terminal device detected by the detecting unit; and a displaying unit displaying the display image data generated by the generating unit on a display unit. If the posture of the terminal device is changed, the generating unit generates the display image data according to the changed posture of the terminal device. If the posture of the terminal device is changed during the generation of the image data by the generating unit, the generating unit does not generate the display image data according to the changed posture of the terminal device, until the generation of the display image data is completed.