Projection-Type Display Apparatus

• US 20070242236A1
• Filed: 07/01/2005
• Published: 10/18/2007
• Est. Priority Date: 02/18/2005
• Status: Active Grant

• Current Assignee: Rakuten Group, Inc.
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Sugiura, Kenji
• Granted Patent: US 7,665,854 B2
• Time in Patent Office: Days
• US Class Current: 353/85
• CPC Class Codes: G03B 21/145 Housing details, e.g. position adjustments thereof

Abstract

In a projection-type display apparatus that projects images onto a screen through a projection lens, even when images, such as setting images of the projection-type-apparatus main unit, that do not need to be displayed on the screen are projected to display, it is also necessary to turn on an expensive light-source lamp whose lifetime is relatively short, resulting in the lifetime of the light-source being shortened. In response to this problem, a lens cover 4 having a display function such as a liquid crystal is therefore used as the lens cover for protecting a projection lens 3, and images that do not need to be displayed onto the screen are displayed on the lens cover 4 having the display function; consequently, light emission from the light-source-lamp is made unnecessary at that time.

Claims

1. A projection-type display apparatus comprising:

an optical part provided in a case of the apparatus;

a display device for modulating light from the optical part into imaging light based on an imaging signal;

a projection lens for projecting the imaging light onto a screen; and

a lens cover for protecting the projection lens, the lens cover;

having a display function for displaying an image based on the imaging signal from the projection-type display apparatus, and for enabling the imaging light to radiate through the projection lens only when the projection lens is uncovered.

2. A projection-type display apparatus as recited in claim 1, wherein the lens cover has a touch-panel function, so as to enable setting and controlling the projection-type-display-apparatus main unit by the touch-panel function.

3. A projection-type display apparatus as recited in claim 1 or 2, wherein the lens cover has a remote-control function, and is configured to be attachable to and detachable from the projection-type-display-apparatus main unit, so as to enable setting and controlling the projection-type display apparatus by the remote-control function.