Projection apparatus for projecting at least one frame onto a projection surface and method therefor

US10362281B2 · kind B2 · utility

Assignee

• OSRAM GmbH · DE

Inventors

• Michael Heise · Erbach, DE
• Marc Czichy · Berlin, DE
• Bastian Dobler · Unterhaching, DE

Key dates

• Filing date: Oct 10, 2016
• Grant date: Jul 23, 2019
• Expiry date: May 30, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N9/3182
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A projection apparatus includes a discharge lamp; a control apparatus for controlling a discharge current through the lamp. The apparatus is designed in a first drive mode, to control the discharge current having an amplitude profile; in a second drive mode, to control the discharge current in accordance with the amplitude profile; and to change between the first mode and the second mode. The time difference between two changes is given by a first time interval, and the time difference between the change from the first mode to the second mode and a next instance of leaving the second mode is given by a second time interval. The apparatus further includes a control device to determine a first manipulated variable depending on a control deviation determined by the difference between a target voltage value and a measured voltage value, and to determine the first and/or the second time interval therefrom.