Screen vibration for reducing speckle
First Claim
1. A method for reducing speckle on a projection screen, comprising:
- locating a transducer near a projection screen; and
attaching a first reactor to the projection screen and proximate to the transducer so that the first reactor is operable to vibrate the projection screen to reduce speckle in a viewing area of the projection screen, wherein the first reactor is located in the approximate range of 0.01 inches to 2 inches from an edge of the projection screen.
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Accused Products
Abstract
The present disclosure provides discussion of screen vibration to reduce speckle in display applications and/or projection screens. Electrical transducers or reactors may be used with a screen to reduce or remove speckle in projection screens and/or display applications. Electrical transducers may not be directly mounted to a screen, thus eliminating many mechanical failure modes associated with a vibrating transducer as well as resulting in a much quieter operation. By design, the reactors or transducers may actually contact the screen, and can take up less than one square inch of screen surface each, than previous designs, which may be outside of the active viewing area and within 12 inches of the screen border, preferably less than approximately 1 inch from screen edge. The reactors are magnets, though any ferrous material can be made to work with certain operating conditions.
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Citations
22 Claims
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1. A method for reducing speckle on a projection screen, comprising:
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locating a transducer near a projection screen; and attaching a first reactor to the projection screen and proximate to the transducer so that the first reactor is operable to vibrate the projection screen to reduce speckle in a viewing area of the projection screen, wherein the first reactor is located in the approximate range of 0.01 inches to 2 inches from an edge of the projection screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vibration system for a projection screen, comprising:
an electromagnet assembly operable to induce movement in a first reactor, wherein the first reactor is adjacent to a screen support patch, further wherein the screen support patch is adjacent to a projection screen, wherein the first reactor is located in the approximate range of 0.01 inches to 2 inches from an edge of the projection screen. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for reducing speckle on a projection screen, comprising:
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employing an electromagnet in the approximate range of 0.01 inches to 2 inches from an edge of the projection screen; driving the transducer with an alternating current signal; vibrating the projection screen substrate with a ferrous material that is driven by the transducer to reduce speckle in the viewing area of the projection screen.
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Specification