Oki Electric Industry Co., Ltd.

Hiromasa Kanno

Hiroshi Hamano

Ichimatsu Abiko

Hiroshi Furuya

Yuji Terouchi

Shigeki Ogura

Shintaro Kotani

Mio Chiba

Hiroshi Tohyama

Tomoo Araki

Takashi Arae

A matrix type display apparatus such as a liquid crystal display is provided which has a simple circuit structure and is capable of enlarging the display of a screen. A shift section is provided with 1024 FF (flip-flop) circuits. When enlarged display mode is designated by a mode signal MOD, one FF circuit is connected in parallel to two FF circuits via a switch SW (an analog switch). Accordingly, R, G, B data for 640 pixels is increased to 960 display voltages and fed to the Y electrodes of a liquid crystal panel. A shift section is provided with 768 FF (flip-flop) circuits. When enlarged display mode is designated, one FF circuit is connected in parallel to two FF circuits via a switch SW. Accordingly, scan voltages for 720 lines are generated from the scan signals of 480 lines and fed to the X electrodes of a liquid crystal panel. Accordingly, a screen display is enlarged vertically and horizontally by a factor of 1.5.

Matrix type display apparatus

Light emitted from an array of light-emitting elements in an electrophotographic printer is transmitted through a birefringent plate that deflects light polarized in a first plane but does not deflect light polarized in a second plane perpendicular to the first plane, and through a polarization switching device that is controlled by an electrical signal so as to selectably transmit light polarized in either the first plane or the second plane. The transmitted light illuminates a photosensitive medium. Each light-emitting element can illuminate two dots on the photosensitive medium, depending on the state of the polarization switching device, thereby doubling the dot resolution.

Double-resolution optical system for electrophotographic printer

Disclosed is an erasable display apparatus including a heat-sensitive medium 1 having a hysteresis effect relative to temperature change. This display apparatus comprises an endless broad-width heat-sensitive display medium 1, driving means 2 for rotating and transferring the heat-sensitive display medium 1, a first heating member 3 for thermally recording information to be displayed on the heat sensitive display medium 1, a plane transparent panel heater 4 disposed on the back of the display surface contiguously to the heat-sensitive display medium 1, lighting means 5 disposed on the back of the transparent heat-insulating member 4 to illuminate the display surface, a color filter 6 disposed in front of the display surface and cooling means 7 for erasing the information recorded on the heat-sensitive display medium 1 after display. By this display apparatus, a display can be accomplished at a high density and the displayed picture quality can be enhanced. This display apparatus can be used repeatedly at a high frequency.

Display apparatus utilizing a thermally color reversible display medium

Growing community of inventors

Tokyo, Japan

Hiromasa Kanno