Browse Prior Art Database

Panel-Change Mechanism of Liquid Crystal Display Projector

IP.com Disclosure Number: IPCOM000036791D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Nakayama, Y: AUTHOR [+2]

Abstract

Disclosed is a mechanism for using transparencies and a liquid crystal display alternatively on an overhead projector.

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Panel-Change Mechanism of Liquid Crystal Display Projector

Disclosed is a mechanism for using transparencies and a liquid crystal display alternatively on an overhead projector.

In a conventional liquid crystal display device used with an overhead projector, a liquid crystal film is protected from the heat of the projector by a pane of glass and a space (air layer) between the film and the stage of the projector. Consequently, images on the film are located above the stage (Fig. 1a), whereas ordinary transparencies are placed directly on the stage (Fig. 1b).

In this mechanism, the liquid crystal film and protective glass are in separate frames, which are hinged together. When the hinge is closed, the film is placed on the glass, and the images on the film are projected (Fig. 2a). When the hinge is opened, the film is removed from the projected area and the protective glass changes its role to a stage for ordinary transparencies (Fig. 2b). The images in both conditions are located at the same height, so a user does not have to adjust the focus when he changes the materials to be projected.

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