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Autonomic keystone adjustment based on projector internal angle

IP.com Disclosure Number: IPCOM000019790D
Original Publication Date: 2003-Sep-29
Included in the Prior Art Database: 2003-Sep-29
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Abstract

Disclosed is a device and method of a keystone adjustment mechanism for Digital Light Projection (DLP) based projectors. This method is based on determination of projector foot-height for evaluation of keystone amount.

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Autonomic keystone adjustment based on projector internal angle

   Mobile digital projectors are becoming more common in the industry. Since each environment is unique based on the height of the surface the projector will be placed on, the distance from the projector to the wall, and the distance from an outlet, the mobile projector keystone must always be adjusted every time the projector is moved or set up.

Figure 1

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Currently, the method for adjusting keystoning is to manually change based on user input through a menu or keystone keys on the projector surface. These methods have the following drawbacks:
1) Time is wasted adjusting the keystoning
2) The projector keystone always must be adjusted per environment
3) Novice users are not aware of keystone capabilities
4) Lack of standard means to access keystone feature - the access method varies from projector to projector

The projector will detect the forward height / tilt the projector is at and adjust keystoning. This will minimize setup time for mobile projector users and will provide consistent images regardless of the room the projector is used in.

In any room, there are three factors that contribute to the angle the projector is raised to:
1) The distance from the projector to the display surface

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2) The height of the table from the floor
3) The height of the projection surface itself.

These three factors contribute to an angle (v) that de...