Diffusing screen
First Claim
Patent Images
1. In a rear projection display device, a method of projecting an image via a rear projection display screen, the method comprising:
- directing light from a light source through a sheet-like structure transparent to one or more wavelengths of the light, the sheet-like structure having a viewing surface and comprising a diffusing pattern configured to create destructive interference of rays of selected wavelengths of light traveling in a parallel direction normal to a plane of the viewing surface; and
destructively interfering rays of selected wavelengths of the light that are traveling in a parallel direction normal to a plane of the viewing surface.
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Abstract
Various embodiments related to a rear projection display screen configured to reduce an intensity of light at a viewing angle at which the light is less likely to be viewed by a user are disclosed. One disclosed embodiment provides a diffusing screen comprising a sheet-like structure transparent to one or more wavelengths of light. The sheet-like structure has a viewing surface and comprises a diffusing pattern configured to create destructive interference of a selected wavelength of light traveling in a direction normal to a plane of the viewing surface of the screen.
19 Citations
20 Claims
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1. In a rear projection display device, a method of projecting an image via a rear projection display screen, the method comprising:
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directing light from a light source through a sheet-like structure transparent to one or more wavelengths of the light, the sheet-like structure having a viewing surface and comprising a diffusing pattern configured to create destructive interference of rays of selected wavelengths of light traveling in a parallel direction normal to a plane of the viewing surface; and destructively interfering rays of selected wavelengths of the light that are traveling in a parallel direction normal to a plane of the viewing surface. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a display system, the display system comprising a housing, a display screen coupled to the housing, and an image source disposed within the housing and configured to project an image onto the display screen, the method comprising:
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projecting an image onto the display screen via light from the image source; directing the light from the image source through the display screen such that the light passes through a diffuser screen layer comprising a pattern having a plurality of pattern elements each comprising a first terrace and a second terrace separated by a distance corresponding to one half of a selected wavelength of visible light plus an integer number of the selected wavelength of visible light; and destructively interfering light of the selected wavelength in a direction normal to the viewing surface. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a horizontal display system, the horizontal display system comprising a housing, a horizontally-oriented rear projection display screen coupled to the housing, an infrared light source disposed within the housing, and an image source disposed within the housing and configured to project an image onto the display screen, the display screen being transparent to one or more wavelengths of visible light and one or more wavelengths of infrared light, the method comprising:
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projecting a visible image onto the display screen via visible light from the image source; illuminating the display screen with infrared light from the infrared light source; directing the visible light through a diffuser screen layer of the display screen, the diffuser screen layer comprising a diffusing pattern with a plurality of pattern elements each comprising a first terrace and a second terrace separated by a distance corresponding to one half of a selected wavelength of visible light plus an integer number of the selected wavelength of visible light, the pattern configured to create destructive interference of the selected wavelength of visible light in a direction normal to the viewing surface; and destructively interfering visible light of the selected wavelength in a direction normal to the viewing surface. - View Dependent Claims (17, 18, 19, 20)
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Specification