Abstract: In a display-integrated panel having first and second electrodes crossing each other and being operable to display a gray scale image, a position indicated by an electronic pen is detected by a method including the step of displaying information on a display panel by repeating a step of displaying one frame.

Abstract: A projector has a shortened optical path from a light valve to a screen and a reduction in the depth size of its system, and requires less space to mount. Rays of light emitted from a light valve of the project are refracted by a converging lens and reflected by a plane mirror to converge at the primary focal point of an elliptical mirror, and then travel toward the secondary focal point whereat the focal point of a parabolic mirror also exists and a projection lens is disposed. The light rays pass through the projection lens, are reflected by the parabolic mirror and then are brought to a parallel beam of light that is further collected by a Fresnel lens to finally form an image on a lenticular lens-screen.

Abstract: A projector has a shortened optical path from a light valve to a screen and a reduction in the depth size of its system and requires less space to mount. Rays of light emitted from a light valve of the projects are refracted by a converging lens and reflected by a plane mirror to converge at the primary focal point of an elliptical mirror, and then travel toward the secondary focal point whereat the focal point of a parabolic mirror also exists and a projection lens is disposed. The light rays pass through the projection lens, are reflected by the parabolic mirror and then are brought to a parallel beam of light that is further collected by a Fresnel lens to finally form an image on a lenticular lens-screen.

Abstract: A projector has a shortened optical path from a light valve to a screen and a reduction in the depth size of its system, and requires less space to mount. Rays of light emitted from a light valve of the projector are refracted by a converging lens and reflected by a plane mirror to converge at the primary focal point of an elliptical mirror, and then travel toward the secondary focal point whereat the focal point of a parabolic mirror also exists and a projection lens is disposed. The light rays pass through the projection lens, are reflected by the parabolic mirror and then are brought to a parallel beam of light that is further collected by a Fresnel lens to finally form an image on a lenticular lens-screen.

Abstract: A liquid crystal projector which comprises image light-refracting means for deflecting the direction in which ligh beams permeating liquid crystal display panel is projected on a screen by an angle corresponding to the suitable viewing angle of the liquid crystal display panel, and wherein image light thus refracted is thrown on a screen in an enlarged form by means of projection lens systems.

Abstract: A power supply control system of an installation including at least two devices having respectively electric circuits, e.g.